INTERNAL COMBUSTION ENGINES QUIZ

The fuel in diesel engine is normally injected at pressure of

20-25 kg/cmÂ²

5-10 kg/cmÂ²

90-130 kg/cmÂ²

60-80 kg/cmÂ²

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The operation of forcing additional air under pressure in the engine cylinder is known as

Turbulence

Supercharging

Pre-ignition

Scavenging

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The normal heptane (C₇H₁₆) is given a rating of ________ octane number.

0

120

100

50

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Stoichiometric ratio is

Chemically correct air-fuel ratio by volume

Chemically correct air-fuel ratio by weight

None of these

Actual air-fuel ratio for maximum efficiency

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The knocking in spark ignition engines can be reduced by

None of these

Retarding the spark

Increasing the engine speed

Both (A) and (B)

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An engine indicator is used to determine the following

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

Temperature

Volume of cylinder

Speed

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The reason for supercharging in any engine is to

Increase power

Reduce weight and bulk for a given output

Effect fuel economy

Increase efficiency

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The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Less

Same

More or less depending on power rating

More

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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

252 cm3

248 cm3

286 cm3

264 cm3

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The correct mixture strength (by weight) for petrol is about

18.5 : 1

22.6 : 1

14.6 : 1

20.4 : 1

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