INTERNAL COMBUSTION ENGINES QUIZ

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

Twice

Equal to

Four-times

One-half

TRUE ANSWER : ?
YOUR ANSWER : ?

Number of working strokes per min. for a two stroke cycle engine is ____ the speed of the engine in r.p.m.

Four-times

Equal to

Twice

One-half

TRUE ANSWER : ?
YOUR ANSWER : ?

In petrol engines, the delay period is of the order of

0.004 second

0.003 second

0.002 second

0.001 second

TRUE ANSWER : ?
YOUR ANSWER : ?

The size of inlet valve of an engine in comparison to exhaust valve is

More

More/less depending on capacity of engine

Less

Same

TRUE ANSWER : ?
YOUR ANSWER : ?

Supercharging is the process of

Supplying compressed air to remove combustion products fully

Providing forced cooling air

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

Injecting excess fuel for raising more loads

TRUE ANSWER : ?
YOUR ANSWER : ?

A diesel engine, during suction stroke, draws

Diesel only

A mixture of diesel and air

Air only

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

2V₀ / (V₀ + V₁)

2V₁ / (V₀ + V₁)

V₀ / (V₀ + V₁)

V₁ / (V₀ + V₁)

TRUE ANSWER : ?
YOUR ANSWER : ?

The thermal efficiency of petrol and gas engines is about

0.5

0.15

0.3

0.7

TRUE ANSWER : ?
YOUR ANSWER : ?

The two reference fuels used for cetane rating are

Cetane and iso-octane

Cetane and tetra ethyl lead

Cetane and alpha-methyl naphthalene

Cetane and normal heptane

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum propulsive efficiency of a turbojet engine is at a speed of

2400 km/h

2000 km/h

3000 km/h

1000 km/h

TRUE ANSWER : ?
YOUR ANSWER : ?