For an irreversible gas turbine cycle, the efficiency and work ratio both depend on

A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

A

Same

B

Lower

C

Higher

D

None of these

The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is

A

Low

B

High

C

Same

D

Low/high depending on make and type

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

A

Remain same

B

Decrease

C

Increase

D

None of the above

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 efficiency and work ratio of a simple gas turbine cycle are

A

Very low

B

Low

C

High

D

Very high

The ratio of the net work obtained from the gas turbine plant to the turbine work is known as

A

Compression ratio

B

Work ratio

C

Pressure ratio

D

None of these

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

A

Increases

B

Decreases

C

First increases and then decreases

D

First decreases and then increases

As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

A

Increases

B

Decreases

C

Remain same

D

First increases and then decreases

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

For an irreversible gas turbine cycle, the efficiency and work ratio both depend on

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