Power Plant Engineering (2171910) MCQs

MCQs of Gas Turbine

Showing 41 to 50 out of 52 Questions
2 3 4 5 6
41.

Reheating in a gas turbine

(a)

increases the thermal efficiency
(b)

increases the compressor work
(c)

increases the turbine work
(d)

decreases the thermal efficiency
Answer:

Option (a)

42.

If an infinite number of heaters be used in a gas turbine, then the expansion process in turbine approaches

(a)

isothermal
(b)

isentropic
(c)

adiabatic
(d)

isochoric
Answer:

Option (a)

43.

Reheating in a multi-stage expansion gas turbine __________ compressor work.

(a)

has no effect on
(b)

decreases
(c)

increases
(d)

can't predict
Answer:

Option (b)

44.

In a gas turbine plant, a regenerator increases

(a)

work output
(b)

pressure ratio
(c)

thermal efficiency
(d)

all of these
Answer:

Option (c)

45.

The gas turbine as compared to an internal combustion engine

(a)

can be driven at a very high speed
(b)

produces uniform torque
(c)

has more efficiency
(d)

all of these
Answer:

Option (d)

46.

The weight per horsepower ratio for the gas turbine compared to I.C. engine and the steam turbine is

(a)

same
(b)

higher
(c)

lower
(d)

none of these
Answer:

Option (c)

47.

Choose the correct statement.

(a)

Gas turbine requires a lot of cooling water
(b)

Gas turbine is capable of rapid start-up and loading
(c)

Gas turbines has flat efficiency at part loads
(d)

Gas turbines have high standby losses and require a lot of maintenance
Answer:

Option (b)

48.

A gas turbine used in aircraft should have

(a)

high h.p. and low weight
(b)

low weight and small frontal area
(c)

small frontal area and high h.p.
(d)

high speed and high h.p.
Answer:

Option (b)

49.

Pick up the false statement.

(a)

Gas turbine is a self starting unit
(b)

Gas turbine does not require huge quantity of water like steam plant
(c)

Exhaust losses in gas turbine are high due to large mass flow rate
(d)

Overall efficiency of gas turbine plant is lower than that of a reciprocating engine
Answer:

Option (a)

50.

It is not possible to use closed gas turbine cycle in aeronautical engines because

(a)

It is inefficient
(b)

It is bulky
(c)

It requires cooling water for its operation
(d)

None of these
Answer:

Option (c)

Showing 41 to 50 out of 52 Questions
2 3 4 5 6