Installation of supercharger on a four cycle diesel engine can result in the following percentage increase in power

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

A

Half

B

Same

C

Double

D

Four times

Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.

A

Half

B

Same

C

Double

D

Four times

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A

Heat rejection is lower

B

Expansion and compression are isentropic

C

Combustion is at constant volume

D

Maximum temperature is higher

In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

A

250°C

B

500°C

C

1000°C

D

2000°C

Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.

A

Equal to

B

Less than

C

Greater than

D

None of these

The scavenging efficiency of a four stroke cycle diesel engine is

A

Below 50%

B

Between 50 and 85%

C

Between 85 and 95%

D

Between 95 and 100%

In a four stroke cycle diesel engine, the compression

A

Starts at 40° after bottom dead center and ends at 10° before top dead center

B

Starts at 40° before top dead center and ends at 40° after top dead center

C

Starts at top dead center and ends at 40° before bottom dead center

D

May start and end anywhere

In a four stroke cycle diesel engine, the inlet valve

A

Opens at 20° before top dead center and closes at 40° after bottom dead center

B

Opens at 20° after top dead center and closes at 20° before bottom dead center

C

Opens at top dead center and closes at bottom dead center

D

May open and close anywhere

The expansion of fuel in a four stroke cycle diesel engine

A

Starts at 15° before top dead center and ends at 30° after top dead center

B

Starts at top dead center and ends at 30° after top dead center

C

Starts at 15° after top dead center and ends at 30° before bottom dead center

D

May start and end anywhere

The fuel valve in a four stroke cycle diesel engine

A

Opens at 15° after top dead center and closes at 20° before bottom dead center

B

Opens at 15° before top dead center and closes at 20° after top dead center

C

Opens at top dead center and closes at bottom dead center

D

May open and close anywhere

Installation of supercharger on a four cycle diesel engine can result in the following percentage increase in power

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