The hydraulic efficiency of a reaction turbine, is the ratio of

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

Parson's reaction turbine is a __________ reaction turbine.

A

40 percent

B

50 percent

C

60 percent

D

70 percent

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

The hydraulic efficiency of an impulse turbine is the

A

Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

B

Ratio of the actual work available at the turbine to the energy imparted to the wheel

C

Ratio of the work done on the wheel to the energy of the jet

D

None of the above

The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,

A

One-fourth

B

One-half

C

Three-fourth

D

Double

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

A

Delivers unit discharge under unit head

B

Delivers unit discharge under unit speed

C

Develops unit power under unit head

D

Develops unit power under unit speed

The hydraulic mean depth or the hydraulic radius is the ratio of

A

Area of flow and wetted perimeter

B

Wetted perimeter and diameter of pipe

C

Velocity of flow and area of flow

D

None of these

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

A

Same

B

Less

C

More

D

None of these

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 hydraulic efficiency of a reaction turbine, is the ratio of

Related Questions