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IC Engines and Nuclear Power Plants MCQ Questions & Answers

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




Question 1

In hit and miss governing, the fuel supply is cut-off completely during one or more number of cycles.

A. Yes
B. No

View Answer

Question 2

U233 is produced

A. artificially
B. as basic raw material
C. when thorium is irradiated by neutrons
D. by fission of U238

View Answer

Question 3

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

A. 25%
B. 50%
C. 70%
D. 100%

View Answer

Question 4

The energy released during the fission of one atom of Uranium - 235 in million electron volts is about

A. 100
B. 200
C. 300
D. 400

View Answer

Question 5

The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.

A. equal to
B. below
C. above

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Question 6

In diesel engines, the fuel is injected in the form of very fine spray, into the engine cylinder, which gets ignited due to high temperature of the compressed air.

A. Agree
B. Disagree

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Question 7

The object of supercharging the engine is

A. to reduce mass ofthe engine per brake power
B. to reduce space occupied by the engine
C. to increase the power output of an engine when greater power is required
D. all ofthe above

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Question 8

The detonation is also called knocking or pinking.

A. Yes
B. No

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Question 9

The effective inhibitor of pre-ignition is

A. alcohol
B. water
C. lead
D. none of these

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Question 10

The detonating tendency in petrol engines increases with increase of compression ratio.

A. TRUE
B. FALSE

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Question 11

Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to

A. cylinder walls being too hot
B. overheated spark plug points
C. red hot carbon deposits on cylinder walls
D. any one of these

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Question 12

In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

A. beginning of suction stroke
B. end of suction stroke
C. beginning of exhaust stroke
D. end of exhaust stroke

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Question 13

The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

A. Agree
B. Disagree

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Question 14

The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

A. jet area is automatically varied depending on the suction
B. the flow from the main jet is diverted to the compensating jet with increase in speed
C. the diameter of the jet is constant and the discharge coefficient is invariant
D. flow is produced due to the static head in the float chamber

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Question 15

The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

A. mechanical efficiency
B. overall efficiency
C. volumetric efficiency
D. relative efficiency

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Question 16

A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

A. slow down the speed of fast moving neutrons
B. control the reaction
C. reduce the temperature
D. extract heat from nuclear reaction

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Question 17

The diesel engines are also known as __________ engines.

A. compression ignition
B. spark ignition

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Question 18

In a diesel engine, the duration between the time of injection and ignition, is known as

A. pre-ignition period
B. delay period
C. period of ignition
D. burning period

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Question 19

The basic requirement of a good combustion chamber is

A. minimum turbulence
B. low compression ratio
C. high thermal efficiency and power output
D. low volumetric efficiency

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Question 20

The injection pressure in a diesel engine is about

A. 10 bar
B. 100 bar
C. 150 bar
D. 500 bar

View Answer

Question 21

A moderator generally used in nuclear power plants is

A. graphite
B. heavy water
C. concrete
D. graphite and concrete

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Question 22

In a four stroke cycle petrol engine, the inlet valve

A. opens at top dead centre and closes at bottom dead centre
B. opens at 20° before top dead centre and closes at 40° after bottom dead centre
C. opens at 20° after top dead centre and closes at 20° before bottom dead centre id) may open or close anywhere

View Answer

Question 23

Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

A. heavy water
B. graphite
C. carbon dioxide
D. no moderator is needed

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Question 24

Morse test can be conducted for

A. petrol engines
B. diesel engines
C. multi-cylinder engines
D. all of these

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Question 25

The secondary fuel used in nuclear power plants is

A. U233 and Pu239
B. U235 and Th232
C. U235 and Pu238
D. U233 and Pu238

View Answer

Question 26

The reference fuels for knock rating of spark ignition engines would include

A. iso-octane and alpha-methyl naphthalene
B. normal octane and aniline
C. iso-octane and normal hexane
D. normal heptane and iso-octane

View Answer

Question 27

The brake power of a diesel engine, keeping other parameters constant, can be increased by

A. decreasing the density of intake air
B. increasing the temperature of intake air
C. increasing the pressure of intake air
D. decreasing the pressure of intake air

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Question 28

Ordinary water is sometimes used as moderator when enriched uranium is used as a fuel in nuclear power plants.

A. Yes
B. No

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Question 29

In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,

A. Agree
B. Disagree

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Question 30

A diesel engine has

A. one valve
B. two valves
C. three valves
D. four valves

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Question 31

Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.

A. 2.46
B. 24.6
C. 246
D. 2460

View Answer

Question 32

In nuclear power plants, due to reflector, less fuel is needed to generate sufficient neutrons to sustain a chain reaction.

A. Yes
B. No

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Question 33

The pressure at the end of compression, in diesel engines, is approximately

A. 10 bar
B. 20 bar
C. 25 bar
D. 35 bar

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Question 34

In a four stroke cycle petrol engine, the charge is ignited at

A. 30° before top dead centre
B. 30° after top dead centre
C. 30° before bottom dead centre
D. 30° after bottom dead centre

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Question 35

The nuclear power station at Tarapur has the reactor of the __________ type.

A. pressurized water
B. boiling water
C. gas cooled
D. liquid metal cooled

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Question 36

The purpose of testing an internal combustion engine is

A. to determine the information, which can not be obtained by calculations
B. to conform the data used in design, the validity of which may be doubtful
C. to satisfy the customer regarding the performance of the engine
D. all of the above

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Question 37

Nuclear reactors are used

A. to produce heat for thermoelectric power
B. to produce fissionable material
C. to propel ships, submarines, aircrafts
D. all of these

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Question 38

The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

A. not effect
B. decrease
C. increase

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Question 39

A carburettor is used to supply

A. petrol, air and lubricating oil
B. air and diesel
C. petrol and lubricating oil
D. petrol and air

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Question 40

High speed compression engines operate on

A. Otto cycle
B. Diesel cycle
C. Dual-combustion cycle
D. all of these

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Question 41

The primary fuel used in nuclear power plants is

A. U235
B. U238
C. Pu239
D. Pu233

View Answer

Question 42

The exhaust valve in a four stroke cycle petrol engine

A. opens at 50° before bottom dead centre and closes at 15° after top dead centre
B. opens at bottom dead centre and closes at top dead centre
C. opens at 50° after bottom dead centre and closes at 15° before top dead centre
D. may open and close anywhere

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Question 43

In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.

A. not effect
B. decrease
C. increase

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Question 44

Reactors for propulsion applications are designed for

A. any form of uranium
B. natura uranium
C. enriched uranium
D. plutonium

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Question 45

The thermal efficiency of diesel engines is about

A. 15%
B. 30%
C. 50%
D. 70%

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Question 46

The expansion of fuel in a four stroke cycle diesel engine

A. starts at 15° before top dead centre and ends at 30° after top dead centre
B. starts at top dead centre and ends at 30° after top dead centre
C. starts at 15° after top dead centre and ends at 30° before bottom dead centre
D. may start and end anywhere

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Question 47

The self ignition temperature of petrol is __________ as compared to diesel oil.

A. same
B. lower
C. higher

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Question 48

The thermal efficiency of diesel engines on weak mixtures is

A. unaffected
B. lower
C. higher
D. dependent on other factors

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Question 49

In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.

A. TRUE
B. FALSE

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Question 50

The predominent isotope of the naturally occuring element is

A. U235
B. U238
C. Pu233
D. Pu239

View Answer