The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

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

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

A

Same

B

Less

C

More

D

More or less depending on power rating

For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

A

Greater than

B

Less than

C

Equal to

D

None of these

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

A

Zero

B

$$\frac{1}{5}$$

C

$$\frac{4}{5}$$

D

1

When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency

A

$$\frac{1}{4}$$

B

Zero

C

$$\frac{1}{5}$$

D

2

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

A

Cut-off is decreased

B

Cut-off is constant

C

Cut-off is increased

D

Cut-off is zero

With increase in compression ratio, the efficiency of the otto engine

A

Increases

B

Decreases

C

Remains constant

D

Increases linearly

The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

A

Same

B

Less

C

More

D

None of these

The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will

A

Increase

B

Decrease

C

Be independent

D

May increase or decrease depending on other factors

Air standard Otto cycle is more efficient than the diesel cycle for the same

A

Heat addition & compression ratio

B

Heat addition & pressure

C

Compression ratio & pressure

D

Cylinder dimension & rpm

The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

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