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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

The lower critical point for all steels is

A. 600°C
B. 700°C
C. 723°C
D. 913°C

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Question 2

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

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

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Question 3

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

A. Yes
B. No

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Question 4

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

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Question 5

Crystal structure 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 6

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

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Question 7

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

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Question 8

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

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Question 9

The heat treatment process used for softening hardened steel is

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

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Question 10

Brass is an alloy of

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

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Question 11

Silicon when added to copper improves

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

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Question 12

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

A. Agree
B. Disagree

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Question 13

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 14

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

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Question 15

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

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Question 16

The hardness of steel increases if it contains

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

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Question 17

Haematite iron ore contains iron about

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

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Question 18

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 19

Shock resisting steels should have

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

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Question 20

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

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Question 21

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

A. superior
B. inferior

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Question 22

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 23

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

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Question 24

The charge is fed into the blast furnace through the

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

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Question 25

Tungsten when added to steel __________ the critical temperature.

A. does not effect
B. lowers
C. raises

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Question 26

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

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Question 27

Cast iron is manufactured in

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

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Question 28

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

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Question 29

Dye penetrant method is generally used to locate

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

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Question 30

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

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Question 31

Iron ore is, usually, found in the form of

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

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Question 32

Cast iron is a

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

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Question 33

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 34

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

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Question 35

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

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Question 36

Ferrite and pearlite makes the steel soft and ductile.

A. Agree
B. Disagree

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Question 37

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

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Question 38

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

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Question 39

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

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Question 40

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

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Question 41

An eutectoid steel consists of

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

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Question 42

Which of the following material has maximum ductility?

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

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Question 43

The cupola is used to manufacture

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

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Question 44

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

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Question 45

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 46

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

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Question 47

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 48

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

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Question 49

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 50

Nimonic contains __________ percentage of nickel as that of Inconel.

A. same
B. less
C. more

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