Power Plant Engineering (2171910) MCQs

MCQs of Gas Turbine

Showing 11 to 20 out of 52 Questions
11.

The type of rotary compressor used in gas turbines, is of

(a)

centrifugal type

(b)

axial flow type

(c)

radial flow type

(d)

none of these

Answer:

Option (b)

12.

The efficiency of the open cycle gas plant is quite low. Why?

(a)

Gas gets heated before reaching the turbine 

(b)

A lot of mechanical energy is used up by the compressor

(c)

Due to the presence of regenerator and absence of air pre heater

(d)

all of these

Answer:

Option (d)

13.

The gas turbine as compared to steam turbine

(a)

requires less space for installation

(b)

has compressor and combustion chamber

(c)

has less efficiency

(d)

all of these

Answer:

Option (d)

14.

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

(a)

same

(b)

lower

(c)

higher

(d)

equal

Answer:

Option (c)

15.

The efficiency of ideal Brayton is given by

(a)

1-1rpγ-1γ

(b)

1-1rpγ+1γ

(c)

1+1rpγ+1γ

(d)

1+1rpγγ-1

Answer:

Option (a)

16.

The condition of pressure ratio for maximum work output for ideal Brayton cycle is 

(a)

rp=T3T1γ2γ+1

(b)

rp=T3T1γ2γ-1

(c)

rp=T1T3γ2γ-1

(d)

rp=T1T3γ2γ+1

Answer:

Option (b)

17.

 The work ratio increases with _____________.

(a)

increase in turbine inlet pressure

(b)

decrease in compressor inlet temperature

(c)

decrease in pressure ratio of the cycle

(d)

all of the mentioned

Answer:

Option (d)

18.

The condition of optimum pressure ratio for maximum work output for actual Brayton cycle is 

(a)

rp=T3T1×ηc×ηtγ2γ+1

(b)

rp=T3T1×ηc×ηt2γγ+1

(c)

rp=T3T1×ηc×ηtγ2γ-1

(d)

rp=T1T3×ηc×ηtγ2γ+1

Answer:

Option (c)

19.

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

Answer:

Option (b)

20.

The fuel consumption in gas turbines is accounted by

(a)

lower heating value

(b)

higher heating value

(c)

heating value

(d)

higher calorific value

Answer:

Option (a)

Showing 11 to 20 out of 52 Questions