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Engineering Materials MCQ Questions & Answers

Engineering Materials MCQs : This section focuses on the "Engineering Materials". These Multiple Choice Questions (MCQs) should be practiced to improve the Engineering Materials skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

A material is known as allotropic or polymorphic if it

A. Has a fixed structure under all conditions
B. Exists in several crystal forms at different temperatures
C. Responds to heat treatment
D. Has its atoms distributed in a random pattern

View Answer

Question 2

Corrosion resistance of steel is increased by adding

A. Chromium and nickel
B. Nickel and molybdenum
C. Aluminium and zinc
D. Tungsten and sulphur

View Answer

Question 3

Pearlite consists of

A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron

View Answer

Question 4

Which of the following impurity in cast iron makes it hard and brittle?

A. Silicon
B. Sulphur
C. Manganese
D. Phosphorus

View Answer

Question 5

The lower critical point for all steels is

A. 600°C
B. 700°C
C. 723°C
D. 913°C

View Answer

Question 6

The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will

A. Increase
B. Decrease
C. Remain same
D. First increase and then decrease

View Answer

Question 7

Perminvar alloy having constant permeability is an alloy of

A. Nickel, copper and iron
B. Nickel, copper and zinc
C. Copper, nickel and antimony
D. Iron, zinc and bismuth

View Answer

Question 8

The ultimate tensile strength of low carbon steel by working at a high strain rate will

A. Decrease
B. Increase
C. Remain constant
D. First increase and then decrease

View Answer

Question 9

Steel with __________ carbon is known as hypo-eutectoid steel.

A. 0.80%
B. Below 0.8%
C. Above 0.8%
D. None of these

View Answer

Question 10

Age hardening is related to

A. Duralumin
B. Brass
C. Copper
D. Silver

View Answer

Question 11

When low carbon steel is heated up to upper critical temperature

A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly

View Answer

Question 12

If a refractory contains high content of silicon, it means refractory is

A. Acidic
B. Basic
C. Neutral
D. Brittle

View Answer

Question 13

Eutectoid reaction occurs at

A. 600°C
B. 723°C
C. 1147°C
D. 1493°C

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Question 14

A coarse grained steel

A. Is less tough and has a greater tendency to distort during heat treatment
B. Is more ductile and has a less tendency to distort during heat treatment
C. Is less tough and has a less tendency to distort during heat treatment
D. Is more ductile and has a greater tendency to distort during heat treatment

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Question 15

The ability of a material to absorb energy in the plastic range is called

A. resilience
B. creep
C. fatigue strength
D. toughness

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Question 16

Steel made from phosphate iron is

A. Brittle
B. Hard
C. Ductile
D. Tough

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Question 17

Isotropic materials are those which have the same

A. Elastic properties in all directions
B. Stresses induced in all directions
C. Thermal properties in all directions
D. Electric and magnetic properties in all directions

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Question 18

Hardness of upper bainite (acicular structure) is about

A. RC 65
B. RC 48
C. RC 57
D. RC 80

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Question 19

A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

A. Allotropic change
B. Recrystallization
C. Heat treatment
D. Precipitation

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Question 20

The property of a material due to which it breaks with little permanent distortion, is called

A. brittleness
B. ductility
C. malleability
D. plasticity

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Question 21

Killed steels' are those steels

A. Which are destroyed by burning
B. Which after their destruction are recycled to produce fresh steel
C. Which are deoxidized in the ladle with silicon and aluminium
D. In which carbon is completely burnt

View Answer

Question 22

Inconel contains

A. 65% nickel, 15% chromium and 20% iron
B. 68% nickel, 29% copper and 3% other constituents
C. 80% nickel and 20% chromium
D. 80% nickel, 14% chromium and 6% iron

View Answer

Question 23

The electric process of steel making is especially adopted to

A. alloy and carbon tool steel
B. magnet steel
C. high speed tool steel
D. all of these

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Question 24

The unique property of cast iron is its high

A. Malleability
B. Ductility
C. Surface finish
D. Damping characteristics

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Question 25

1841 high speed steel contains

A. Vanadium 4%, chromium 18% and tungsten 1%
B. Vanadium 1%, chromium 4% and tungsten 18%
C. Vanadium 18%, chromium 1% and tungsten 4%
D. None of the above

View Answer

Question 26

The toughness of a material __________ when it is heated.

A. Remain same
B. Decreases
C. Increases
D. None of these

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Question 27

Solder is an alloy consisting of

A. Tin, antimony, copper
B. Tin and copper
C. Tin and lead
D. Lead and zinc

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Question 28

In compression, a prism of brittle material will break

A. By forming a bulge
B. By shearing along oblique plane
C. In direction perpendicular to application of load
D. By crushing into thousands of pieces

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Question 29

Which of the following is the binding material in cemented carbides?

A. Cobalt
B. Nickel
C. Vanadium
D. Iron

View Answer

Question 30

Chilled cast iron has

A. No graphite
B. A very high percentage of graphite
C. A low percentage of graphite
D. Graphite as its basic constituent of composition

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Question 31

Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

A. Bessemer process
B. Open hearth process
C. Electric process
D. LD process

View Answer

Question 32

Which of the following statement is incorrect about duralumin?

A. It is prone to age hardening
B. It can be forged
C. It has good machining properties
D. It is lighter than pure aluminium

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Question 33

In nodular iron, graphite is in the form of

A. Cementite
B. Free carbon
C. Flakes
D. Spheroids

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Question 34

Free cutting steels

A. Contain carbon in free from
B. Require minimum cutting force
C. Is used where rapid machining is the prime requirement
D. Can be cut freely

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Question 35

Phosphor bronze contains

A. 0.5% of phosphorous
B. 1% phosphorous
C. 2.5% phosphorous
D. None of the above

View Answer

Question 36

A reversible change in the atomic structure of steel with corresponding change in the properties is known as

A. Molecular change
B. Physical change
C. Allotropic change
D. Solidus change

View Answer

Question 37

Bronze is an alloy of

A. Copper and zinc
B. Copper and tin
C. Copper, tin and zinc
D. None of these

View Answer

Question 38

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

A. 770°C
B. 910°C
C. 1050°C
D. Below recrystallization temperature

View Answer

Question 39

A material is said to be allotropic, if it has

A. fixed structure at all temperatures
B. atoms distributed in random pattern
C. different crystal structures at different temperatures
D. any one of the above

View Answer

Question 40

Which of the following statement is true about brittle fracture?

A. High temperature and low strain rates favour brittle fracture
B. Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
C. Brittle fracture is always preceded by noise
D. Cup and cone formation is characteristic for brittle materials

View Answer

Question 41

Iron ore is usually found in the form of

A. Oxides
B. Carbonates
C. Sulphides
D. All of these

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Question 42

For the allotropic forms of iron, the points of arrest are

A. The points where no further change occurs
B. Constant for all metals
C. The points where there is no further flow of metal
D. The points of discontinuity

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Question 43

Pick up the wrong statement

A. Aluminium in steel results in excessive grain growth
B. Manganese in steel induces hardness
C. Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility
D. Tungsten in steels improves magnetic properties and hardenability

View Answer

Question 44

The composition of silver solder is

A. Silver, copper, zinc
B. Silver, tin, nickel
C. Silver, lead, zinc
D. Silver, copper, aluminium

View Answer

Question 45

Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?

A. Bessemer process
B. Open hearth process
C. Duplex process
D. Electric process

View Answer

Question 46

Silicon when added to copper improves

A. machinability
B. hardness
C. hardness and strength
D. strength and ductility

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Question 47

In mottled cast iron, carbon is available in

A. Free form
B. Combined form
C. Nodular form
D. Partly in free and partly in combined state

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Question 48

The lower critical temperature

A. decreases as the carbon content in steel increases
B. increases as the carbon content in steel increases
C. is same for all steels
D. depends upon the rate of heating

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Question 49

An example of amorphous material is

A. Zinc
B. Lead
C. Silver
D. Glass

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Question 50

Dislocations in materials refer to the following type of defect

A. Point defect
B. Line defect
C. Plane defect
D. Volumetric defect

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Question 51

Blast furnace produces following by reduction of iron ore

A. Cast iron
B. Pig iron
C. Wrought iron
D. Malleable iron

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Question 52

In high speed steels, manganese is used to tougher the metal and to increase its

A. Yield point
B. Critical temperature
C. Melting point
D. Hardness

View Answer

Question 53

The crystal structure of brass is

A. F.C.C.
B. B.C.C.
C. H.C.P.
D. Orthorhombic crystalline structure

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Question 54

Aluminium bronze contains aluminium and copper in the ratio of

A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 10 : 90

View Answer

Question 55

Which of the following metal shrinks most from molten state to solid state?

A. Cast iron
B. Cast steel
C. Brass
D. Admiralty metal

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Question 56

Which of the following statement is correct?

A. The product produced by blast-furnace is called cast iron
B. The pig iron is the name given to the product produced by cupola
C. The cast iron has high tensile strength
D. The chilled cast iron has no graphite

View Answer

Question 57

The charge is fed into the blast furnace through the

A. stack
B. throat
C. bosh
D. tuyers

View Answer

Question 58

Which of the following property is desirable for materials used in tools and machines?

A. Elasticity
B. Plasticity
C. Ductility
D. Malleability

View Answer

Question 59

The steel widely used for motor car crankshafts is

A. Nickel steel
B. Chrome steel
C. Nickel-chrome steel
D. Silicon steel

View Answer

Question 60

Connecting rod is, usually, made from

A. Low carbon steel
B. High carbon steel
C. Medium carbon steel
D. High speed steel

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Question 61

Nodular cast iron is produced by adding __________ to the molten cast iron.

A. nickel
B. chromium
C. copper
D. magnesium

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Question 62

Iron ore is, usually, found in the form of

A. oxides
B. carbonates
C. sulphides
D. all of these

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Question 63

Nimonic contains __________ percentage of nickel as that of Inconel.

A. Same
B. Less
C. More
D. None of these

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Question 64

The presence of sulphur in pig iron makes

A. It easily machinable
B. It brittle
C. It hard
D. The casting unsound

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Question 65

The hardness of steel primarily depends on

A. Percentage of carbon
B. Percentage of alloying elements
C. Heat treatment employed
D. Shape of carbides and their distribution in iron

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Question 66

A cold chisel is made of

A. Mild steel
B. Cast iron
C. H.S.S.
D. High carbon

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Question 67

When the steel is normalised, its

A. yield point increases
B. ductility decreases
C. ultimate tensile strength increases
D. all of these

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Question 68

The type of space lattice found in gamma-iron is

A. face centred cubic space lattice
B. body centred cubic space lattice
C. close packed hexagonal space lattice
D. none of these

View Answer

Question 69

Delta iron occurs at temperature of

A. Room temperature
B. Above melting point
C. Between 1400°C and 1539°C
D. Between 910°C and 1400°C

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Question 70

Tin base white metals are used where the bearings are subjected to

A. Large surface wear
B. Elevated temperatures
C. Light load and pressure
D. High pressure and load

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Question 71

Blast furnace is used to produce

A. Pig iron
B. Cast iron
C. Wrought iron
D. Steel

View Answer

Question 72

In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon

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Question 73

Amorphous material is one

A. In which atoms align themselves in a geometric pattern upon solidification
B. In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. Which is not attacked by phosphorous
D. Which emits fumes on melting

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Question 74

The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.

A. Yes
B. No

View Answer

Question 75

The metal suitable for bearings subjected to light loads, is

A. Silicon bronze
B. White metal
C. Monel metal
D. Phosphor bronze

View Answer

Question 76

Pearlite is a combination of

A. Ferrite and cementite
B. Cementite and gamma iron
C. Ferrite and austenite
D. Ferrite and iron graphite

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Question 77

Gun metal contains

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 78% copper and rest tin

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Question 78

Pick up the wrong statement Nickel and chromium in steel help in

A. Providing corrosion resistance
B. Improving machining properties
C. Providing high strength at elevated temperatures
D. Raising the elastic limit

View Answer

Question 79

Duralumin contains

A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
D. 5 to 6% tin, 2 to 3% copper and rest aluminium

View Answer

Question 80

Basic constituents of Monel metal are

A. Nickel, copper
B. Nickel, molybdenum
C. Zinc, tin, lead
D. Nickel, lead and tin

View Answer

Question 81

The aluminium alloy, mainly used, for anodized utensil manufacture, is

A. Duralumin
B. Y-alloy
C. Magnalium
D. Hindalium

View Answer

Question 82

The percentage carbon content in wrought iron is about

A. 0.02
B. 0.1
C. 2
D. 0.4

View Answer

Question 83

Cyaniding is the process of

A. Dipping steel in cyanide bath
B. Reacting steel surface with cyanide salts
C. Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
D. Obtaining cyanide salts

View Answer

Question 84

Which of the following is used for bearing liner?

A. Gun metal
B. Bronze
C. Bell metal
D. Babbitt metal

View Answer

Question 85

The coordination number of a face centered cubic space lattice is

A. Six
B. Twelve
C. Eighteen
D. Twenty

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Question 86

Acidic solution is one which has pH value

A. Greater than 7
B. Less than 7
C. Equal to 7
D. pH value has nothing to do with neutral solution

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Question 87

Pure iron is the structure of

A. Ferrite
B. Pearlite
C. Austenite
D. Ferrite and cementite

View Answer

Question 88

The hardness of steel increases if it contains

A. pearlite
B. ferrite
C. cementite
D. martensite

View Answer

Question 89

Y-alloy contains

A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
D. 5 to 6% tin, 2 to 3% copper and rest aluminium

View Answer

Question 90

The metal suitable for bearings subjected to heavy loads, is

A. Silicon bronze
B. White metal
C. Monel metal
D. Phosphor bronze

View Answer

Question 91

Recrystallization temperature can be lowered by

A. Purification of metal
B. Grain refinement
C. Working at lower temperature
D. All of the above

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Question 92

The machinability of aluminium increases when _________ is added to aluminium.

A. Copper
B. Magnesium
C. Silicon
D. Lead and bismuth

View Answer

Question 93

The following element can't impart high strength at elevated temperature

A. Manganese
B. Magnesium
C. Nickel
D. Silicon

View Answer

Question 94

The electric process of steel making is especially adapted to

A. Alloy and carbon tool steel
B. Magnet steel
C. High speed tool steel
D. All of these

View Answer

Question 95

Manganese in steel increases its

A. Tensile strength
B. Hardness
C. Ductility
D. Fluidity

View Answer

Question 96

Pig iron is the name given to

A. Raw material for blast furnace
B. Product of blast furnace made by reduction of iron ore
C. Iron containing huge quantities of carbon
D. Iron in molten form in the ladles

View Answer

Question 97

In process annealing, the hypo eutectoid steel is

A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D. Heated below or closes to the lower critical temperature and then cooled slowly

View Answer

Question 98

Which is false statement about annealing? Annealing is done to

A. Relieve stresses
B. Harden steel slightly
C. Improve machining characteristic
D. Soften material

View Answer

Question 99

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

A. chromium
B. nickel
C. vanadium
D. cobalt

View Answer

Question 100

Maximum percentage of carbon in austenite is

A. 0.03%
B. 0.26%
C. 0.80%
D. 1.70%

View Answer

Question 101

Closed packed hexagonal space lattice is found in

A. zinc, magnesium, cobalt, cadmium, antimony and bismuth
B. gamma-iron, aluminium, copper, lead, silver and nickel
C. alpha-iron, tungsten, chromium and molybdenum
D. none of the above

View Answer

Question 102

Hardness of martensite is about

A. RC 65
B. RC 48
C. RC 57
D. RC 80

View Answer

Question 103

The hardness is the property of a material due to which it

A. can be drawn into wires
B. breaks with little permanent distortion
C. can cut another metal
D. can be rolled or hammered into thin sheets

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Question 104

In low carbon steels, presence of small quantities of sulphur improves

A. Weldability
B. Formability
C. Machinability
D. Hardenability

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Question 105

Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20

View Answer

Question 106

Addition of lead and bismuth to aluminium results in

A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability

View Answer

Question 107

Cast iron is manufactured in

A. blast furnace
B. cupola
C. open hearth furnace
D. bessemer converter

View Answer

Question 108

Depth of hardness of steel is increased by addition of

A. Nickel
B. Chromium
C. Tungsten
D. Vanadium

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Question 109

In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

A. In still air
B. Slowly in the furnace
C. Suddenly in a suitable cooling medium
D. Any one of these

View Answer

Question 110

In which of the following cases, consideration of creep is important

A. Flywheel of steam engine
B. Cast iron pipes
C. Cycle chains
D. Gas turbine blades

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Question 111

Macrostructure of a material is, generally, examined by

A. Naked eye
B. Optical microscope
C. Metallurgical microscope
D. X-ray techniques

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Question 112

Corrosion resistance of steel is increased by addition of

A. Chromium and nickel
B. Sulphur, phosphorus, lead
C. Vanadium, aluminium
D. Tungsten, molybdenum, vanadium, chromium

View Answer

Question 113

The alloy used for making electrical resistances and heating elements is

A. Nichrome
B. Invar
C. Magnin
D. Elinvar

View Answer

Question 114

Which of the following has a fine gold colour and is used for imitation jewellery?

A. Silicon bronze
B. Aluminium bronze
C. Gun metal
D. Babbitt metal

View Answer

Question 115

Nickel in steel

A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anti-corrosion properties

View Answer

Question 116

Which of the following has a fine gold colour and is used for imitation jewellery?

A. Silicon bronze
B. Aluminium bronze
C. Gun metal
D. Babbit metal

View Answer

Question 117

High carbon steel carries carbon percentage

A. 0.1 to 0.3%
B. 0.3 to 0.6%
C. 0.6 to 0.8%
D. 0.8 to 1.5%

View Answer

Question 118

Permalloy is a

A. Kind of stainless steel
B. None ferrous alloy
C. Polymer
D. Nickel and iron alloy having high permeability

View Answer

Question 119

The charge is fed into the blast furnace through the

A. Stack
B. Throat
C. Bosh
D. Tyres

View Answer

Question 120

Nodular cast iron is produced by adding ________ to the molten cast iron.

A. Nickel
B. Chromium
C. Copper
D. Magnesium

View Answer

Question 121

The strength is the ability of a material to resist

A. Deformation under stress
B. Externally applied forces with breakdown or yielding
C. Fracture due to high impact loads
D. None of these

View Answer

Question 122

Tensile strength of steel can be safely increased by

A. Adding carbon up to 2.8%
B. Adding carbon up to 6.3%
C. Adding carbon up to 0.83%
D. Adding small quantities of copper

View Answer

Question 123

Ductile cast iron

A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough and easily machined metal
D. Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

View Answer

Question 124

The machinability of steel is improved by adding

A. Nickel
B. Chromium
C. Nickel and chromium
D. Sulphur, lead and phosphorus

View Answer

Question 125

Delta-iron occurs between the temperature ranges of

A. 400°C to 600°C
B. 600°C to 900°C
C. 900°C to 1400°C
D. 1400°C to 1530°C

View Answer

Question 126

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

A. 50 : 50
B. 30 : 70
C. 70 : 30
D. 40 : 60

View Answer

Question 127

Heavy duty leaf and coil springs contain carbon of the following order

A. 0.20%
B. 0.50%
C. 0.80%
D. 1.00%

View Answer

Question 128

The material widely used for making pendulums of clocks is

A. Stainless steel
B. High speed steel
C. Heat resisting steel
D. Nickel steel

View Answer

Question 129

Maximum percentage of carbon in ferrite is

A. 0.03%
B. 0.06%
C. 0.10%
D. 0.25%

View Answer

Question 130

In induction hardening ________ is high.

A. Current
B. Voltage
C. Frequency
D. Temperature

View Answer

Question 131

The heat treatment process used for softening hardened steel is

A. carburising
B. normalising
C. annealing
D. tempering

View Answer

Question 132

Free carbon in iron makes the metal

A. soft and gives a coarse grained crystalline structure
B. soft and gives a fine grained crystalline structure
C. hard and gives a coarse grained crystalline structure
D. hard and gives a fine grained crystalline structure

View Answer

Question 133

Normalising of steel is done to

A. Refine the grain structure
B. Remove strains caused by cold working
C. Remove dislocations caused in the internal structure due to hot working
D. All of the above

View Answer

Question 134

The correct composition of Babbitt metal is

A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
C. 87% Sn, 4% Cu, 8% Sb, 1% Al
D. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

View Answer

Question 135

Body centered cubic space lattice is found in

A. Zinc, magnesium, cobalt, cadmium, antimony and bismuth
B. Gamma iron, aluminium, copper, lead, silver and nickel
C. Alpha iron, tungsten, chromium and molybdenum
D. None of the above

View Answer

Question 136

Pipes for bicycle frames are made of

A. Cold rolled steel
B. Hot rolled steel
C. Forged steel
D. Cast steel

View Answer

Question 137

In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled

A. in still air
B. slowly in the furnace
C. suddenly in a suitable cooling medium
D. any one of these

View Answer

Question 138

Cast iron is a

A. ductile material
B. malleable material
C. brittle material
D. tough material

View Answer

Question 139

The material in which the atoms are arranged chaotically, is called

A. Amorphous material
B. Mesomorphous material
C. Crystalline material
D. None of these

View Answer

Question 140

For a steel containing 0.8% carbon

A. There is no critical point
B. There is only one critical point
C. There are two critical points
D. There can be any number of critical points

View Answer

Question 141

Dow metal contains

A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C. 90% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper

View Answer

Question 142

Which is false statement about normalizing? Normalizing is done to

A. Refine grain structure
B. Reduce segregation in casting
C. Improve mechanical properties
D. Induce stresses

View Answer

Question 143

Which of the following represents the allotropic forms of iron?

A. Alpha iron, beta iron and gamma iron
B. Alpha iron and beta iron
C. Body centered cubic iron and face centered cubic iron
D. Alpha iron, gamma from and delta iron

View Answer

Question 144

Connecting rod is usually made of

A. Aluminium
B. Low carbon steel
C. Medium carbon steel
D. High carbon steel

View Answer

Question 145

Quenching is not necessary when hardening is done by

A. Case hardening
B. Flame hardening
C. Nitriding
D. Any one of these

View Answer

Question 146

The basic constituents of Hastelloy are

A. Aluminium, copper etc.
B. Nickel, molybdenum etc.
C. Nickel, Copper, etc.
D. All of the above

View Answer

Question 147

Basic solution is one which has pH value

A. Greater than 7
B. Equal to 7
C. Less than 7
D. pH value has nothing to do with basic solution

View Answer

Question 148

Which of the following alloys does not have copper as one of the constituents?

A. Delta metal
B. Monel metal
C. Constantan
D. Nichrome

View Answer

Question 149

Beryllium bronze has

A. High yield point
B. High fatigue limit
C. Both (A) and (B)
D. None of these

View Answer

Question 150

Slow plastic deformation of metals under a constant stress is known as

A. Creep
B. Fatigue
C. Endurance
D. Plastic deformation

View Answer

Question 151

Which of the following statements are true for annealing of steels?

A. Steels are heated to 500 to 700°C
B. Cooling is done slowly and steadily
C. Internal stresses are relieved
D. All of these

View Answer

Question 152

Smelting is the process of

A. removing the impurities like clay, sand etc. from the iron ore by washing with water
B. expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
C. reducing the ore with carbon in the presence of a flux
D. all of the above

View Answer

Question 153

When the steel is normalized, its

A. Yield point increases
B. Ductility decreases
C. Ultimate tensile strength increases
D. All of these

View Answer

Question 154

The alloy, mainly used for corrosion resistance in stainless steels is

A. Silicon
B. Manganese
C. Carbon
D. Chromium

View Answer

Question 155

The ability of a material to resist fracture due to high impact loads, is called

A. Strength
B. Stiffness
C. Toughness
D. Brittleness

View Answer

Question 156

Which of the following pipes is least corrosion resistant?

A. Brass
B. Mild steel
C. Cast iron
D. Wrought iron

View Answer

Question 157

Melting point of iron is

A. 1539°C
B. 1601°C
C. 1489°C
D. 1712°C

View Answer

Question 158

Monel metal contains

A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Malleable iron and zinc

View Answer

Question 159

The coke in the charge of blast furnace

A. Controls the grade of pig iron
B. Acts as an iron bearing mineral
C. Supplies heat to reduce ore and melt the iron
D. Forms a slag by combining with impurities

View Answer

Question 160

Malleable cast iron

A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough, and easily machined metal
D. Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

View Answer

Question 161

Iron is

A. Paramagnetic
B. Ferromagnetic
C. Ferroelectric
D. Dielectric

View Answer

Question 162

An alloy of copper, tin and zinc is known as

A. Brass
B. Bronze
C. Gun metal
D. Muntz metal

View Answer

Question 163

The material in which the atoms are arranged regularly in some directions but not in others, is called

A. amorphous material
B. mesomorphous material
C. crystalline material
D. none of these

View Answer

Question 164

When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

A. Mainly ferrite
B. Mainly pearlite
C. Ferrite and pearlite
D. Pearlite and cementite

View Answer

Question 165

Which of the following statement is wrong?

A. Steel with 0.8% carbon is wholly pearlite
B. The amount of cementite increases with the increase in percentage of carbon in iron
C. A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
D. The cementite is identified as round particles in the structure

View Answer

Question 166

Mild steel belongs to the following category

A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Alloy steel

View Answer

Question 167

Crystal structure of a material is, generally, examined by

A. naked eye
B. optical microscope
C. metallurgical microscope
D. X-ray techniques

View Answer

Question 168

Nodular iron has

A. High machinability
B. Low melting point
C. High tensile strength
D. All of the above

View Answer

Question 169

White cast iron has

A. Carbon in the form of carbide
B. Low tensile strength
C. High compressive strength
D. All of these

View Answer

Question 170

The unit cells

A. contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
B. have the same orientation and their similar faces are parallel
C. may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
D. all of the above

View Answer

Question 171

Dye penetrant method is generally used to locate

A. core defects
B. surface defects
C. superficial defects
D. temporary defects

View Answer

Question 172

Cobalt in steel

A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
C. Improves cutting ability and reduce hardenability
D. Gives ductility, toughness, tensile strength and anti corrosion property

View Answer

Question 173

Delta metal is an alloy of

A. Copper, zinc and iron
B. Iron, nickel and copper
C. Iron, lead and tin
D. Iron, aluminium and magnesium

View Answer

Question 174

Cast iron is characterized by minimum of following percentage of carbon

A. 0.20%
B. 0.80%
C. 1.30%
D. 2%

View Answer

Question 175

Which of the following is an amorphous material?

A. Mica
B. Silver
C. Lead
D. Glass

View Answer

Question 176

The alloying element which can replace tungsten in high speed steels is

A. Nickel
B. Vanadium
C. Cobalt
D. Molybdenum

View Answer

Question 177

White cast iron has a high tensile strength and a low compressive strength.

A. Yes
B. No

View Answer

Question 178

By severely deforming a metal in a particular direction it becomes

A. Ductile
B. Malleable
C. Homogeneous
D. Anisotropic

View Answer

Question 179

The portion of the blast furnace below its widest cross-section is called

A. Hearth
B. Stack
C. Bosh
D. Throat

View Answer

Question 180

The type of space lattice found in alpha-iron is

A. Face centered cubic space lattice
B. Body centered cubic space lattice
C. Close packed hexagonal space lattice
D. None of these

View Answer

Question 181

Aluminium bronze contains

A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper

View Answer

Question 182

Which of the following constituents of steels is softest and least strong?

A. Austenite
B. Pearlite
C. Ferrite
D. Cementite

View Answer

Question 183

In a hardening process, the hypo-eutectoid steel is

A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D. Heated below or closes to the lower critical temperature and then cooled slowly

View Answer

Question 184

According to Indian standard specifications, SG 400/15 means

A. Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
B. Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
C. Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
D. None of the above

View Answer

Question 185

Tungsten when added to steel __________ the critical temperature.

A. does not effect
B. lowers
C. raises

View Answer

Question 186

Super conduction by metals is observed in the temperature range of

A. Below 10°K
B. Above 100°K
C. Around 0°C
D. Around 100°C

View Answer

Question 187

The unit cells

A. Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
B. Have the same orientation and their similar faces are parallel
C. May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
D. All of the above

View Answer

Question 188

Railway rails are normally made of

A. Mild steel
B. Alloy steel
C. High carbon
D. Tungsten steel

View Answer

Question 189

The hardness and tensile strength in austenitic stainless steel can be increased by

A. Hardening and cold working
B. Normalizing
C. Martempering
D. Full annealing

View Answer

Question 190

Brass is an alloy of

A. copper and zinc
B. copper and tin
C. copper, tin and zinc
D. none of these

View Answer

Question 191

An engineer's hammer is made of

A. Cast iron
B. Forged steel
C. Mild steel
D. High carbon steel

View Answer

Question 192

Steel contains

A. 80% or more iron
B. 50% or more iron
C. Alloying elements like chromium, tungsten nickel and copper
D. Elements like phosphorus, sulphur and silicon in varying quantities

View Answer

Question 193

Large forgings, crank shafts, axles normally contain carbon up to

A. 0.05 to 0.20%
B. 0.20 to 0.45%
C. 0.45 to 0.55%
D. 0.55 to 1.0%

View Answer

Question 194

The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called

A. Duralumin
B. Y-alloy
C. Magnalium
D. Hindalium

View Answer

Question 195

Bronze contains

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 75% copper and rest tin

View Answer

Question 196

The type of space lattice found in gamma-iron is

A. Face centered cubic space lattice
B. Body centered cubic space lattice
C. Close packed hexagonal space lattice
D. None of these

View Answer

Question 197

The heat treatment process used for softening hardened steel is

A. Carburising
B. Normalizing
C. Annealing
D. Tempering

View Answer

Question 198

Which of the following elements does not impart hardness to steel?

A. Copper
B. Chromium
C. Nickel
D. Silicon

View Answer

Question 199

Chromium when added to steel _________ the tensile strength.

A. Does not effect
B. Decreases
C. Increases
D. None of these

View Answer

Question 200

Addition of manganese to aluminium results in

A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability

View Answer

Question 201

Preheating is essential in welding

A. Cast iron
B. High speed steel
C. All nonferrous materials
D. All of the above

View Answer

Question 202

Stress relaxation is the phenomenon

A. In which parts are not loaded
B. In which stress remains constant on increasing load
C. In which deformation tends to loosen the joint and produces a stress reduced
D. Stress reduces on increasing load

View Answer

Question 203

Which is false statement about properties of aluminium?

A. Modulus of elasticity is fairly low
B. Wear resistance is very good
C. Fatigue strength is not high
D. Creep strength limits its use to fairly low temperatures

View Answer

Question 204

Carbon steel is

A. Made by adding carbon in steel
B. Refined from cast iron
C. An alloy of iron and carbon with varying quantities of phosphorus and sulphur
D. Extensively used for making cutting tools

View Answer

Question 205

The property of a material essential for spring materials is

A. Stiffness
B. Ductility
C. Resilience
D. Plasticity

View Answer

Question 206

Nickel when added to copper improves

A. Machinability
B. Hardness
C. Hardness and strength
D. Strength and ductility

View Answer

Question 207

The compressive strength of cast iron is __________that of its tensile strength.

A. Equal to
B. Less than
C. More than
D. None of these

View Answer

Question 208

Malleability of a material can be defined as

A. Ability to undergo large permanent deformations in compression
B. Ability to recover its original form
C. Ability to undergo large permanent deformations in tension
D. All of the above

View Answer

Question 209

In spheroidising process, the steel is

A. Heated below the lower critical temperature and then cooled slowly
B. Heated up to the lower critical temperature and then cooled in still air
C. Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
D. None of the above

View Answer

Question 210

The silicon steel is widely used for

A. Connecting rods
B. Cutting tools
C. Generators and transformers in the form of laminated cores
D. Motor car crankshafts

View Answer

Question 211

Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

A. Equal to
B. Less than
C. More than
D. None of these

View Answer

Question 212

Which of the following is added in low carbon steels to prevent them from becoming porous?

A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon

View Answer

Question 213

The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as

A. Hysteresis
B. Creep
C. Visco elasticity
D. Boeschinger effect

View Answer

Question 214

The quenching of steel from the upper critical point results in a fine grained structure.

A. Agree
B. Disagree

View Answer

Question 215

The hardness of steel depends upon the

A. Amount of cementite it contains
B. Amount of carbon it contains
C. Contents of alloying elements
D. Method of manufacture of steel

View Answer

Question 216

Grey cast iron has

A. Carbon in the form of free graphite
B. High tensile strength
C. Low compressive strength
D. All of these

View Answer

Question 217

White cast iron

A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough and easily machined metal
D. Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

View Answer

Question 218

A small percentage of boron is added to steel in order to

A. increase hardenability
B. reduce machinability
C. increase wear resistance
D. increase endurance strength

View Answer

Question 219

In grey cast iron, carbon is present in the form of

A. Cementite
B. Free carbon
C. Flakes
D. Spheroids

View Answer

Question 220

Cementite consist of

A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron

View Answer

Question 221

German silver contains

A. 1% silver
B. 2% silver
C. 5% silver
D. No silver

View Answer

Question 222

There are fourteen atoms in a unit cell of

A. Body centered cubic space lattice
B. Face centered cubic space lattice
C. Close packed hexagonal space lattice
D. None of these

View Answer

Question 223

The transistor is made of

A. Silver
B. Gold
C. Copper
D. Germanium

View Answer

Question 224

Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

A. Babbitt metal
B. Monel metal
C. Nichrome
D. Phosphor bronze

View Answer

Question 225

The brown smoke during the operation of a Bessemer converter indicates that the

A. Air is burning out silicon and manganese
B. Silicon and manganese has burnt and carbon has started oxidizing
C. The converter must be titled to remove the contents of the converter
D. The brown smoke does not occur during the operation of a Bessemer converter

View Answer

Question 226

Taps dies and drills contain carbon

A. Below 0.5%
B. Below 1%
C. Above 1%
D. Above 2.2%

View Answer

Question 227

Weld decay is the phenomenon found with

A. Cast iron
B. Mild steel
C. Nonferrous materials
D. Stainless steel

View Answer

Question 228

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

A. eutectic cast irons
B. hypo-eutectic cast irons
C. hyper-eutectic cast irons
D. none of these

View Answer

Question 229

A specimen of aluminium metal when observed under microscope shows

A. B.C.C. crystalline structure
B. F.C.C. crystal structure
C. H.C.P. structure
D. A complex cubic structure

View Answer

Question 230

Monel metal is an alloy of

A. Nickel and copper
B. Nickel and chromium
C. Nickel, Chromium and iron
D. Copper and chromium

View Answer

Question 231

The elastic stress strain behavior of rubber is

A. Linear
B. Nonlinear
C. Plastic
D. No fixed relationship

View Answer

Question 232

When low carbon steel is heated up to lower critical temperature

A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly

View Answer

Question 233

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

A. Eutectic cast irons
B. Hypoeutectic cast irons
C. Hypereutectic cast irons
D. None of these

View Answer

Question 234

Specify the sequence correctly

A. Grain growth, recrystallisation, stress relief
B. Stress relief, grain growth, recrystallisation
C. Stress relief, recrystallisation, grain growth
D. Grain growth, stress relief, recrystallisation

View Answer

Question 235

The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

A. Coordination number
B. Atomic packing factor
C. Space lattice
D. None of these

View Answer

Question 236

In malleable iron, carbon is present in the form of

A. Cementite
B. Free carbon
C. Flakes
D. Nodular aggregates of graphite

View Answer

Question 237

Ductility of a material can be defined as

A. Ability to undergo large permanent deformations in compression
B. Ability to recover its original form
C. Ability to undergo large permanent deformations in tension
D. All of the above

View Answer

Question 238

White cast iron contains carbon in the form of

A. Free carbon
B. Graphite
C. Cementite
D. White carbon

View Answer

Question 239

Hardness of steel depends on

A. Amount of carbon it contains
B. The shape and distribution of the carbides in iron
C. Method of fabrication
D. Contents of alloying elements

View Answer

Question 240

Nimonic contains __________ percentage of nickel as that of Inconel.

A. same
B. less
C. more

View Answer

Question 241

Tungsten in high speed steel provides

A. Hot hardness
B. Toughness
C. Wear resistance
D. Sharp cutting edge

View Answer

Question 242

The main alloying elements high speed steel in order of increasing proportion are

A. Vanadium, chromium, tungsten
B. Tungsten, titanium, vanadium
C. Chromium, titanium, vanadium
D. Tungsten, chromium, titanium

View Answer

Question 243

The correct sequence for descending order of machinability is

A. Grey cast iron, low carbon steel, wrought iron
B. Low carbon steel, grey cast iron, wrought iron
C. Wrought iron, low carbon steel, grey cast iron
D. Wrought iron, grey cast iron, low carbon steel

View Answer

Question 244

Which is false statement about case hardening? Case hardening is done by

A. Electroplating
B. Cyaniding
C. Induction hardening
D. Nitriding

View Answer

Question 245

Neutral solution is one which has pH value

A. Greater than 7
B. Less than 7
C. Equal to 7
D. pH value has nothing to do with neutral solution

View Answer

Question 246

The stiffness is the ability of a material to resist

A. Deformation under stress
B. Fracture due to high impact loads
C. Externally applied forces with breakdown or yielding
D. None of the above

View Answer

Question 247

Which is the false statement about wrought iron? It has

A. High resistance to rusting and corrosion
B. High ductility
C. Ability of hold protective coating
D. Uniform strength in all directions

View Answer

Question 248

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

A. Silicon
B. Sulphur
C. Manganese
D. Phosphorus

View Answer

Question 249

The hardness and tensile strength in austenitic stainless steel can be increased by

A. hardening and cold working
B. normalising
C. martempering
D. full annealing

View Answer

Question 250

The percentage of carbon in grey iron castings usually varies between

A. 0.5 to 1%
B. 1.20%
C. 2.5 to 4.5%
D. 5 to 7%

View Answer

Question 251

An important property of malleable cast iron in comparison to grey cast iron is the high

A. Compressive strength
B. Ductility
C. Carbon content
D. Hardness

View Answer

Question 252

Wrought iron is

A. Hard
B. High in strength
C. Highly resistant to corrosion
D. Heat treated to change its properties

View Answer

Question 253

Tungsten in steel

A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anti-corrosion properties

View Answer

Question 254

The surface hardness of the following order is achieved by nitriding operation

A. 600 VPN
B. 1500 VPN
C. 1000 to 1100 VPN
D. 250 VPN

View Answer

Question 255

Tungsten when added to steel __________ the critical temperature.

A. Does not effect
B. Lowers
C. Raises
D. None of these

View Answer

Question 256

Inconel is an alloy of

A. Nickel, chromium and iron
B. Nickel, copper
C. Nickel, Chromium
D. Nickel, zinc

View Answer

Question 257

Constantan an alloy used in thermocouples is an alloy of

A. Copper and tin
B. Copper and zinc
C. Copper and iron
D. Copper and nickel

View Answer

Question 258

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

A. chromium
B. silicon
C. manganese
D. magnesium

View Answer

Question 259

In basic Bessemer process, the furnace is lined with

A. Silica bricks
B. A mixture of tar and burnt dolomite bricks
C. Both (A) and (B)
D. None of these

View Answer

Question 260

Shock resisting steels should have

A. low wear resistance
B. low hardness
C. low tensile strength
D. toughness

View Answer

Question 261

The defect which takes place due to imperfect packing of atoms during crystallization is known as

A. Line defect
B. Surface defect
C. Point defect
D. None of these

View Answer

Question 262

Paramagnetic alpha iron changes to gamma iron at

A. 770°C
B. 910°C
C. 1440°C
D. 1539°C

View Answer

Question 263

Cemented carbide tools are not found to be suitable for cutting

A. Brass
B. Cast iron
C. Aluminium
D. Steel

View Answer

Question 264

Malleable cast iron is produced

A. by adding magnesium to molten cast iron
B. by quick cooling of molten cast iron
C. from white cast iron by annealing process
D. none of these

View Answer

Question 265

The crystal structure of gamma iron is

A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure

View Answer

Question 266

The molecules in a solid move

A. In a random manner
B. In a haphazard way
C. In circular motion
D. Back and forth like tiny pendulums

View Answer

Question 267

The bond formed by transferring electrons from one atom to another is called

A. Ionic bond
B. Covalent bond
C. Metallic bond
D. None of these

View Answer

Question 268

Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element

A. Iron
B. Copper
C. Aluminium
D. Nickel

View Answer

Question 269

The metallic structure of mild steel is

A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure

View Answer

Question 270

Balls for ball bearings are made of

A. Cast iron
B. Mild steel
C. Stainless steel
D. Carbon-chrome steel

View Answer

Question 271

An eutectoid steel consists of

A. wholly pearlite
B. wholly austenite
C. pearlite and ferrite
D. pearlite and cementite

View Answer

Question 272

Austenite is a combination of

A. Ferrite and cementite
B. Cementite and gamma iron
C. Ferrite and austenite
D. Ferrite and iron graphite

View Answer

Question 273

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

A. White cast iron
B. Nodular cast iron
C. Malleable cast iron
D. Alloy cast iron

View Answer

Question 274

Which of the following iron exist between 910°C and 1403°C?

A. α-iron
B. β-iron
C. γ-iron
D. δ-iron

View Answer

Question 275

Drop forging dies contain carbon of the order of

A. 0.1 to 0.2%
B. 0.25 to 0.5%
C. 0.6 to 0.7%
D. 0.7 to 0.9%

View Answer

Question 276

The temperature required for full annealing in hypereutectoid steel is

A. 30° C to 50° C above upper critical temperature
B. 30° C to 50° C below upper critical temperature
C. 30° C to 50° C above lower critical temperature
D. 30° C to 50° C below lower critical temperature

View Answer

Question 277

When medium carbon steel is heated to coarsening temperature

A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly

View Answer

Question 278

Vanadium in high speed steels

A. Promotes decarburisation
B. Provides high hot hardness
C. Forms very hard carbides and thus increases wear resistance
D. Promotes retention of austenite

View Answer

Question 279

Which of the following element results in presence of free graphite in C.I.?

A. Carbon
B. Sulphur
C. Silicon
D. Manganese

View Answer

Question 280

The ability of a material to resist softening at high temperature is known as

A. Creep
B. Hot tempering
C. Hot hardness
D. Fatigue

View Answer

Question 281

Hardness of lower bainite (tempered martensite) is about

A. RC 65
B. RC 48
C. RC 57
D. RC 80

View Answer

Question 282

Compressive strength of grey cast iron in tonnes/cm is of the order of

A. 35
B. 57
C. 710
D. 1015

View Answer

Question 283

Carbon in iron is an example of

A. Substitutional solution
B. Interstitial solid solution
C. Intermetallic compounds
D. All of the above

View Answer

Question 284

Admiralty gun metal contains

A. 63 to 67% nickel and 30% copper
B. 88% copper, 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Iron scrap and zinc

View Answer

Question 285

Sulphur in pig iron tends to make it

A. Hard
B. Soft
C. Ductile
D. Tough

View Answer

Question 286

The blade of a power saw is made of

A. Boron steel
B. High speed steel
C. Stainless steel
D. Malleable cast iron

View Answer

Question 287

Cupola produces following material

A. Cast iron
B. Pig iron
C. Wrought iron
D. Malleable iron

View Answer

Question 288

The tensile strength of wrought iron is maximum

A. Along the lines of slag distribution
B. Perpendicular to lines of slag distribution
C. Uniform in all directions
D. None of the above

View Answer

Question 289

Which of the following is not the correct method of increasing fatigue limit?

A. Shot peening
B. Nitriding of surface
C. Cold working
D. Surface decarburisation

View Answer

Question 290

Argentite is the principal ore or raw material for

A. Aluminium
B. Tin
C. Zinc
D. Silver

View Answer

Question 291

Babbitt metal is a

A. Lead base alloy
B. Copper base alloy
C. Tin base alloy
D. Cadmium base alloy

View Answer

Question 292

Machining properties of steel are improved by adding

A. Sulphur, lead, phosphorous
B. Silicon, aluminium, titanium
C. Vanadium, aluminium
D. Chromium, nickel

View Answer

Question 293

Chromium in steel

A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anti-corrosion properties

View Answer

Question 294

Thermoplastic materials are those materials which

A. are formed into shape under heat and pressure and results in a permanently hard product
B. do not become hard with the application of heat and pressure and no chemical change occurs
C. are flexible and can withstand considerable wear under suitable conditions
D. are used as a friction lining for clutches and brakes

View Answer

Question 295

The addition of which of the following improves machining of copper?

A. Sulphur
B. Vanadium
C. Tin
D. Zinc

View Answer

Question 296

Hematite iron ore contains iron about

A. 30%
B. 45%
C. 55%
D. 70%

View Answer

Question 297

Addition of copper to aluminium results in

A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability

View Answer

Question 298

The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.

A. superior
B. inferior

View Answer

Question 299

The charge of the blast furnace consists of

A. Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
B. Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
C. Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
D. Calcined ore, coke and limestone all in equal parts

View Answer

Question 300

Age-hardening is related with

A. Stainless steel
B. Gun metal
C. German silver
D. Duralumin

View Answer

Question 301

Gamma iron exits at following temperature

A. Room temperature
B. Near melting point
C. Between 1400°C and 1539°C
D. Between 910°C and 1400°C

View Answer

Question 302

An important property of high silicon (12-18%) cast iron is the high

A. Hardness
B. Brittleness
C. Plasticity
D. Ductility

View Answer

Question 303

Beryllium bronze contains

A. 60% copper and 40% beryllium
B. 80% copper and 20% beryllium
C. 97.75% copper and 2.25% beryllium
D. 99% copper and 1% beryllium

View Answer

Question 304

Annealing of white cast iron results in production of

A. Malleable iron
B. Nodular iron
C. Spheroidal iron
D. Grey iron

View Answer

Question 305

When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

A. Equal to
B. Less than
C. More than
D. None of these

View Answer

Question 306

The maximum internal diameter of a blast furnace is about

A. 3 m
B. 6 m
C. 9 m
D. 12 m

View Answer

Question 307

Materials after cold working are subjected to following process to relieve stresses

A. Hot working
B. Tempering
C. Normalizing
D. Annealing

View Answer

Question 308

Recrystallization temperature is one

A. At which crystals first start forming from molten metal when it is cooled
B. At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. At which change of allotropic form takes place
D. At which crystals grow bigger in size

View Answer

Question 309

The hardness of steel increases if it contains

A. Austenite
B. Martensite
C. Pearlite
D. Cementite

View Answer

Question 310

The machinability of steel is increased by

A. Silicon and sulphur
B. Phosphorous, lead and sulphur
C. Sulphur, graphite and aluminium
D. Phosphorous and aluminium

View Answer

Question 311

Specify the sequence correctly

A. Grain growth, recrystallization, stress relief
B. Stress relief, grain growth, recrystallization
C. Stress relief, recrystallization, grain growth
D. Grain growth, stress relief, recrystallization

View Answer

Question 312

Foundry crucible is made of

A. Mild steel
B. German silver
C. Lead
D. Graphite

View Answer

Question 313

Cast iron has

A. High tensile strength
B. Its elastic limit close to the ultimate breaking strength
C. High ductility
D. All of the above

View Answer

Question 314

German silver is an alloy of

A. Silver and some impurities
B. Refined silver
C. Nickel, Copper and zinc
D. Nickel and copper

View Answer

Question 315

According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

A. 0.04%
B. 0.35 to 0.45%
C. 0.4 to 0.6%
D. 0.6 to 0.8%

View Answer

Question 316

A steel containing 16 to 18% chromium and about 0.12% carbon is called

A. Ferritic stainless steel
B. Austenitic stainless steel
C. Martenistic stainless steel
D. Nickel steel

View Answer

Question 317

Sulphur in cast iron

A. Makes the iron soft and easily machinable
B. Increases hardness and brittleness
C. Make the iron white and hard
D. Aids fusibility and fluidity

View Answer

Question 318

Induction hardening is the process of

A. Hardening surface of work-piece to obtain hard and wear resistant surface
B. Heating and cooling rapidly
C. Increasing hardness throughout
D. Inducing hardness by continuous process

View Answer

Question 319

Steel containing ferrite and pearlite is

A. Hard
B. Soft
C. Tough
D. Hard and tough

View Answer

Question 320

Grey cast iron

A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. I is soft, tough and easily machined metal
D. Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material

View Answer

Question 321

Which of the following display properties similar to that of steel?

A. Blackheart cast iron
B. Whiteheart cast iron
C. Both (A) and (B)
D. None of these

View Answer

Question 322

Which of the following metal is used for nuclear energy?

A. Uranium
B. Thorium
C. Niobium
D. All of these

View Answer

Question 323

Which one of the following metals would work-harden more quickly than the others?

A. Copper
B. Brass
C. Lead
D. Silver

View Answer

Question 324

Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

A. Silver metal
B. Duralumin
C. Hastelloy
D. Invar

View Answer

Question 325

Muntz metal contains copper and zinc in the ratio of

A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 20 : 80

View Answer

Question 326

Eutectoid steel contains following percentage of carbon

A. 0.02%
B. 0.30%
C. 0.63%
D. 0.80%

View Answer

Question 327

Brass contains

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 75% copper and rest tin

View Answer

Question 328

Wrought iron

A. Is a ductile material
B. Can be easily forged or welded
C. Cannot stand sudden and excessive shocks
D. All of these

View Answer

Question 329

Cold rolled steel sheets contain carbon of the following order

A. 0.10%
B. 0.20%
C. 0.40%
D. 0.60%

View Answer

Question 330

Ferromagnetic alpha iron exists in temperature range of

A. Below 723°C
B. 770 to 910°C
C. 910 to 1440°C
D. 1400 to 1539°C

View Answer

Question 331

The alloying element which reduces the formation of iron sulphide in steel is

A. Chromium
B. Nickel
C. Vanadium
D. Manganese

View Answer

Question 332

Combined carbon in iron makes the metal

A. Soft and gives coarse grained crystalline structure
B. Soft and gives a fine grained crystalline structure
C. Hard and gives a coarse grained crystalline structure
D. Hard and gives a fine grained crystalline structure

View Answer

Question 333

The coke in the charge of blast furnace

A. controls the grade of pig iron
B. acts as an iron-bearing mineral
C. supplies heat to reduce ore and melt the iron
D. forms a slag by combining with impurities

View Answer

Question 334

In the lower part of the blast furnace (zone of fusion), the temperature is

A. 400° to 700°C
B. 800°C to 1000°C
C. 1200°C to 1300°C
D. 1500°C to 1700°C

View Answer

Question 335

Shock resistance of steel is increased by adding

A. Nickel
B. Chromium
C. Nickel and chromium
D. Sulphur, lead and phosphorus

View Answer

Question 336

The percentage of carbon in cast iron varies from

A. 0.1 to 0.5
B. 0.5 to 1
C. 1 to 1.7
D. 1.7 to 4.5

View Answer

Question 337

Which is false statement about tempering? Tempering is done to

A. Improve machinability
B. Improve ductility
C. Improve toughness
D. Release stresses

View Answer

Question 338

Haematite iron ore contains iron about

A. 30%
B. 45%
C. 55%
D. 70%

View Answer

Question 339

Sulphur in steel

A. Acts as deoxidiser
B. Reduces the grain size
C. Decreases tensile strength and hardness
D. Lowers the toughness and transverse ductility

View Answer

Question 340

When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

A. Cementite
B. Free graphite
C. Both A and B
D. None of these

View Answer

Question 341

Which of the following has highest specific strength of all structural materials?

A. Magnesium alloys
B. Titanium alloys
C. Chromium alloys
D. Magnetic steel alloys

View Answer

Question 342

Following elements have face-centered cubic structure

A. Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
B. Mg, Zn, Ti, Zr, Br, Cd
C. A iron (below 910°C and between 1400 to 1539°C), W
D. All of the above

View Answer

Question 343

The most effective inhibitor of grain growth, when added in small quantities is

A. Carbon
B. Vanadium
C. Manganese
D. Cobalt

View Answer

Question 344

Points of arrest for iron correspond to

A. Stages at which allotropic forms change
B. Stages at which further heating does not increase temperature for some time
C. Stages at which properties do not change with increase in temperature
D. There is nothing like points of arrest

View Answer

Question 345

The usual composition of a soldering alloy is

A. Tin, lead and small percentage of antimony
B. Tin and lead
C. Tin, lead and silver
D. Tin and copper

View Answer

Question 346

Which of the following material has nearly zero coefficient of expansion?

A. Stainless steel
B. High speed steel
C. Invar
D. Heat resisting steel

View Answer

Question 347

The presence of hydrogen in steel causes

A. Reduced neutron absorption cross-section
B. Improved Weldability
C. Embrittlement
D. Corrosion resistance

View Answer

Question 348

Bell metal contains

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 75% copper and rest tin

View Answer

Question 349

Corundum contains more than 95%

A. Steel
B. Al2O3
C. SiO2
D. MgO

View Answer

Question 350

Cartridge brass can be

A. Cold rolled into sheets
B. Drawn into wires
C. Formed into tube
D. Any one of these

View Answer

Question 351

Ferrite and pearlite makes the steel soft and ductile.

A. Agree
B. Disagree

View Answer

Question 352

Induction hardening is basically a

A. Carburising process
B. Surface hardening process
C. Core hardening process
D. None of these

View Answer

Question 353

The crystal of alpha iron is

A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure

View Answer

Question 354

Structural steel contains following principal alloying elements

A. Nickel, chromium and manganese
B. Tungsten, molybdenum and phosphorous
C. Lead, tin, aluminium
D. Zinc, sulphur, and chromium

View Answer

Question 355

Gamma-iron occurs between the temperature ranges of

A. 400°C to 600°C
B. 600°C to 900°C
C. 900°C to 1400°C
D. 1400°C to 1530°C

View Answer

Question 356

Process of Austempering results in

A. Formation of bainite structure
B. Carburised structure
C. Martenistic structure
D. Lamellar layers of carbide distributed throughout the structure

View Answer

Question 357

The cupola is used to manufacture

A. pig iron
B. cast iron
C. wrought iron
D. steel

View Answer

Question 358

The following types of materials are usually the most ductile

A. Face centered cubic lattice
B. Body centered cubic lattice
C. Hexagonal close packed lattice
D. All of the above

View Answer

Question 359

Manganese is added in low carbon steel to

A. Make the steel tougher and harder
B. Raise the yield point
C. Make the steel ductile and of good bending qualities
D. All of the above

View Answer

Question 360

Pick up wrong statement about wrought iron

A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

View Answer

Question 361

White metal contains

A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Silver and chromium

View Answer

Question 362

The purpose of heat treatment is to

A. Relieve the stresses set up in the material after hot or cold working
B. Modify the structure of the material
C. Change grain size
D. Any one of these

View Answer

Question 363

Ball bearings are, usually, made from

A. Low carbon steel
B. High carbon steel
C. Medium carbon steel
D. Chrome steel

View Answer

Question 364

The property of a material which enables it to retain the deformation permanently, is called

A. Brittleness
B. Ductility
C. Malleability
D. Plasticity

View Answer

Question 365

Brass (alloy of copper and zinc) is an example of

A. Substitutional solid solution
B. Interstitial solid solution
C. Intermetallic compounds
D. All of the above

View Answer

Question 366

Addition of silicon to aluminium results in

A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability

View Answer

Question 367

Which of the following material has maximum ductility?

A. Mild steel
B. Copper
C. Nickel
D. Aluminium

View Answer

Question 368

Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon

View Answer