Compressors, Gas Turbines and Jet Engines MCQs

Question 1

When air is to be compressed at a high pressure, then it is advantageous to use

Accepted Answer

Multistage compression with intercooling

Answer

Single stage compression

Answer

Multistage compression without intercooling

Answer

None of these

Question 2

Mining industry usually employs following motive power

Accepted Answer

Compressed air

Answer

A.C. electric motor

Answer

Petrol engine

Answer

Diesel engine

Question 3

If the flow of air through the compressor is perpendicular to its axis, then it is a

Accepted Answer

Centrifugal compressor

Answer

Reciprocating compressor

Answer

Axial flow compressor

Answer

Turbo compressor

Question 4

A rocket works with maximum overall efficiency when air craft velocity is equal to the

Accepted Answer

Half the jet velocity

Answer

Jet velocity

Answer

Twice the jet velocity

Answer

Average of the jet velocity

Question 5

The volumetric efficiency of a compressor

Accepted Answer

Decreases with increase in compression ratio

Answer

Increases with decrease in compression ratio

Answer

Decreases with decrease in compression ratio

Answer

Increases with increase in compression ratio

Question 6

The ratio of specific weight/h.p. of gas turbine and I.C. engines may be typically of the order of

Accepted Answer

1 : 6

Answer

1 : 1

Answer

2 : 1

Answer

4 : 1

Question 7

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

Accepted Answer

Higher

Answer

Same

Answer

Lower

Answer

None of these

Question 8

Aeroplanes employ following type of compressor

Accepted Answer

Axial flow

Answer

Radial flow

Answer

Centrifugal

Answer

None of the above