INTERNAL COMBUSTION ENGINES QUIZ

The thermal efficiency of petrol and gas engines is about

0.7

0.5

0.3

0.15

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Remain same

None of these

Increase

Decrease

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of these

Increase

Decrease

Not effect

TRUE ANSWER : ?
YOUR ANSWER : ?

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

286 cm3

264 cm3

252 cm3

248 cm3

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is more viscous lube oil?

SAE 70

SEA 30

SAE 80

SAE 50

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value of gaseous fuels is expressed in terms of

kcal

kcal/kg

kcal/mÂ²

kcal/m3

TRUE ANSWER : ?
YOUR ANSWER : ?

The effective inhibitor of pre-ignition is

Lead

Alcohol

None of these

Water

TRUE ANSWER : ?
YOUR ANSWER : ?

A fuel of cetane number 40 has the same ignition quality as a mixture of

40% alpha methyl naphthalene and 60% cetane

40% petrol and 60% diesel

40% cetane and 60% alpha methyl naphthalene

40% diesel and 60% petrol

TRUE ANSWER : ?
YOUR ANSWER : ?

The actual volume of fresh charge admitted in 4-stroke petrol engine is

More than stroke volume

Equal to stroke volume and clearance volume

Less than stroke volume

Equal to stroke volume

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Beginning of suction stroke

End of suction stroke

End of exhaust stroke

Beginning of exhaust stroke

TRUE ANSWER : ?
YOUR ANSWER : ?

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