For the same compression ratio, the efficiency of dual combustion cycle is

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

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 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

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 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 combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

A

75%

B

85%

C

90%

D

99%

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

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A

Engine can run

B

Engine gives maximum output

C

Engine is most efficient

D

Fuel can be used in a test engine without knocking

For the same compression ratio, the efficiency of dual combustion cycle is

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