Compressors, Gas Turbines and Jet Engines MCQs

Question 1

The velocity of air entering in a rocket is _________ as compared to an aircraft.

Accepted Answer

Zero

Answer

Less

Answer

More

Answer

Same

Question 2

In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the

Accepted Answer

Thrust and range of aircraft

Answer

Efficiency of the engine

Answer

Both (A) and (B)

Answer

None of these

Question 3

The efficiency of the vane blower is (where W1 = Work done due to compression and W2 = Work done due to back flow)

Accepted Answer

$$\frac{{{{	ext{W}}_2}}}{{{{	ext{W}}_1} + {{	ext{W}}_2}}}$$

Answer

$$\frac{{{{	ext{W}}_1}}}{{{{	ext{W}}_1} + {{	ext{W}}_2}}}$$

Answer

$$\frac{{{{	ext{W}}_1} + {{	ext{W}}_2}}}{{{{	ext{W}}_1}}}$$

Answer

$$\frac{{{{	ext{W}}_1} + {{	ext{W}}_2}}}{{{{	ext{W}}_2}}}$$

Question 4

A compressor at high altitudes will require ________ power.

Accepted Answer

More

Answer

Same

Answer

Less

Answer

None of these

Question 5

In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

Accepted Answer

Discharge nozzle

Answer

Atmosphere

Answer

Vacuum

Answer

Back to the compressor

Question 6

In jet engines the products of combustion after passing through the gas turbine are discharged into

Accepted Answer

Discharge nozzle

Answer

Atmosphere

Answer

Back to the compressor

Answer

Vacuum

Question 7

Pick up the false statement

Accepted Answer

Gas turbine is a self starting unit

Answer

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

Answer

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

Answer

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

Question 8

The closed cycle in gas turbines

Accepted Answer

Provides greater flexibility

Answer

Provides lesser flexibility

Answer

In never used

Answer

Is used when gas is to be burnt

Question 9

Efficiency of gas turbine is increased by

Accepted Answer

All of the above

Answer

Reheating

Answer

Inter cooling

Answer

Adding a regenerator