INTERNAL COMBUSTION ENGINES QUIZ

In a four stroke cycle engine, the sequence of operations is

Suction, expansion, compression and exhaust

Expansion, compression, suction and exhaust

Compression, expansion, suction and exhaust

Suction, compression, expansion and exhaust

TRUE ANSWER : ?
YOUR ANSWER : ?

Iso-octane (C₈H₁₈) has octane number of

100

0

50

120

TRUE ANSWER : ?
YOUR ANSWER : ?

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

35 bar

25 bar

10 bar

20 bar

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Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?

Unpredictable

Yes

No

To some extent

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

Decrease

None of these

Increase

Not effected

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The fuel in diesel engine is normally injected at pressure of

60-80 kg/cmÂ²

90-130 kg/cmÂ²

20-25 kg/cmÂ²

5-10 kg/cmÂ²

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The knocking tendency in spark ignition engines may be decreased by

Controlling the air-fuel mixture

Reducing the compression ratio

Controlling the ignition timing

Controlling the exhaust temperature

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The _________ engines can work on very lean mixture of fuel.

Spark ignition

Compression ignition

Both (A) and (B)

None of these

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Detonation is harmful due to

None of these

Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls

Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

High intensity of knock causes crankshaft vibration and the engine runs rough

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An engine indicator is used to determine the following

Speed

Temperature

Volume of cylinder

m.e.p. and I.H.P.

TRUE ANSWER : ?
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