Online Mechanical Engineering Test - IC Engines and Nuclear Power Plants Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

beginning of suction stroke

end of suction stroke

beginning of exhaust stroke

end of exhaust stroke

[#]

A diesel engine has

one valve

two valves

three valves

four valves

[#]

The detonation is also called knocking or pinking.

Yes

[#]

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

Agree

Disagree

[#]

The working pressure and temperature inside the cylinder of an internal combustion engine is __________ as compared to a steam engine.

low

very low

high

very high

[#]

A supercharged engine as compared to an ordinary engine

requires smaller foundation

is lighter

consumes less lubricating oil

all of these

[#]

Supercharging __________ the power developed by the engine.

has no effect on

increases

decreases

[#]

In qualitative governing, the quantity of fuel is varied to suit the load on the engine and the total charge of air is altered.

Correct

Incorrect

[#]

If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbo-jet engine is

[#]

10.

A turbo-jet does not require a turbine to drive the compressor.

True

False

[#]

11.

The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.

increase

decrease

[#]

12.

Number of working strokes per min. for a four stroke cycle engine are __________ the speed of the engine in r.p.m.

equal to

one-half

twice

four-times

[#]

13.

A gas engine has a swept volume of 300 cm³ and clearance volume of 25 cm³. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

248 cm³

252 cm³

264 cm³

286 cm³

[#]

14.

A two stroke cycle engine gives __________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.

half

same

double

four times

[#]

15.

The delay period in oil engines increases with increase in the speed of engine.

Agree

Disagree

[#]

16.

The ignition quality of petrol is expressed by

cetane number

octane number

calorific value

all of these

[#]

17.

A diesel engine has inlet valve, fuel injection valve and exhaust valve.

Yes

[#]

18.

The octane number of petrol, generally available, is

20 to 40

40 to 60

60 to 80

80 to 100

[#]

19.

If the compression ratio in I.C. engine increases, then its thermal efficiency will

decrease

increase

remain same

[#]

20.

The volumetric efficiency ofa well designed engine may be

30 to 40%

40 to 60%

60 to 70%

75 to 90%

[#]

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Online Mechanical Engineering Test - IC Engines and Nuclear Power Plants Test

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