Engineering Thermodynamics (3131905) MCQs

MCQs of Gas Power Cycles

Showing 21 to 30 out of 37 Questions
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21.

What is the range of Thermal efficiency in the Brayton cycle?

(a)

30-35%
(b)

40-45%
(c)

50-55%
(d)

50-60%
Answer:

Option (c)

22.

Which of the following is not a component of Brayton cycle?

(a)

Compressor
(b)

Combustion Chamber
(c)

Turbine
(d)

Pump
Answer:

Option (d)

23.

The efficiency of simple Brayton cycle increases with increase of 

(a)

volume ratio of compression
(b)

pressure ratio
(c)

outlet pressure of turbine
(d)

all of these
Answer:

Option (b)

24.

In Brayton cycle, the gas is cooled at

(a)

constant volume
(b)

constant temperature
(c)

constant pressure
(d)

none of these
Answer:

Option (c)

25.

The efficiency of Brayton cycle is given by

(a)

1-1rpγ-1γ

(b)

1+1rpγ-1γ

(c)

1+1rpγ+1γ

(d)

1+1rpγγ-1

Answer:

Option (a)

26.

In a Brayton cycle gas turbine, the gas is compressed

(a)

isothermally
(b)

polytropically
(c)

isentropically
(d)

none of these
Answer:

Option (c)

27.

The ratio of the network 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)

28.

 The work ratio in gas trubine 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)

29.

An Otto cycle consists of following processes

(a)

two adiabatic and two constant pressure
(b)

two isothermal and two adiabatic
(c)

two isothermal and two constant volume
(d)

two adiabatic and two constant volume
Answer:

Option (d)

30.

Air standard efficiency of Otto cycle is given by,

(a)

1-1rγ

(b)

1-1rγ+1

(c)

1-1rγ-1

(d)

1+1rγ-1

Answer:

Option (c)

Showing 21 to 30 out of 37 Questions
1 2 3 4