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IC Engines and Nuclear Power Plants MCQ

The predominent isotope of the naturally occuring element is

Pu239

Pu233

U238

U235

Answer

Correct Answer: U238

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

True

False

Answer

Correct Answer: True

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

25%

50%

70%

100%

Answer

Correct Answer: 50%

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

Carbon dioxide

Graphite

No moderator is needed

Heavy water

Answer

Correct Answer: No moderator is needed

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The thermal efficiency of diesel engines on weak mixtures is

Lower

Dependent on other factors

Higher

Unaffected

Answer

Correct Answer: Higher

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

Agree

Disagree

Answer

Correct Answer: Agree

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A carburettor is used to supply

Petrol and lubricating oil

Petrol, air and lubricating oil

Air and diesel

Petrol and air

Answer

Correct Answer: Petrol and air

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

24.6

246

2.46

2460

Answer

Correct Answer: 2.46

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A moderator generally used in nuclear power plants is

Graphite and concrete

Concrete

Heavy water

Graphite

Answer

Correct Answer: Graphite and concrete

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

Pressurized water

Gas cooled

Liquid metal cooled

Boiling water

Answer

Correct Answer: Boiling water

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U233 is produced

When thorium is irradiated by neutrons

As basic raw material

By fission of U238

Artificially

Answer

Correct Answer: When thorium is irradiated by neutrons

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

End of suction stroke

End of exhaust stroke

Beginning of exhaust stroke

Beginning of suction stroke

Answer

Correct Answer: Beginning of suction stroke

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

25 bar

35 bar

10 bar

20 bar

Answer

Correct Answer: 35 bar

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

Iso-octane and alpha-methyl naphthalene

Normal octane and aniline

Iso-octane and normal hexane

Normal heptane and iso-octane

Answer

Correct Answer: Normal heptane and iso-octane

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The diesel engines are also known as __________ engines.

Spark ignition

Compression ignition

Answer

Correct Answer: Compression ignition

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

Decreasing the density of intake air

Increasing the pressure of intake air

Decreasing the pressure of intake air

Increasing the temperature of intake air

Answer

Correct Answer: Increasing the pressure of intake air

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High speed compression engines operate on

Dual-combustion cycle

Otto cycle

All of these

Diesel cycle

Answer

Correct Answer: Dual-combustion cycle

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

Yes

Answer

Correct Answer: Yes

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

Disagree

Agree

Answer

Correct Answer: Agree

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The basic requirement of a good combustion chamber is

Low volumetric efficiency

Minimum turbulence

High thermal efficiency and power output

Low compression ratio

Answer

Correct Answer: High thermal efficiency and power output

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