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

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

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

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

A

More

B

Less

C

Same

D

Data insufficient to predict

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

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 the dual combustion cycle for the same compression ratio is __________ Diesel cycle.

A

Greater than

B

Less than

C

Equal to

D

None of these

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 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

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

Related Questions