Compressors, Gas Turbines and Jet Engines MCQs

Question 1

In a single acting reciprocating air compressor, without clearance, the compression of air may be

Accepted Answer

Any one of these

Answer

Isothermal

Answer

Polytropic

Answer

Isentropic

Question 2

The propulsive power of the rocket is (where v1 = Jet velocity and v2 = Aircraft velocity)

Accepted Answer

$$\frac{{{	ext{v}}_1^2 - {	ext{v}}_2^2}}{{2{	ext{g}}}}$$

Answer

$$\frac{{{{\left( {{{	ext{v}}_1} - {{	ext{v}}_2}} ight)}^2}}}{{2{	ext{g}}}}$$

Answer

$$\frac{{{	ext{v}}_1^2 - {	ext{v}}_2^2}}{{	ext{g}}}$$

Answer

$$\frac{{{{\left( {{{	ext{v}}_1} - {{	ext{v}}_2}} ight)}^2}}}{{	ext{g}}}$$

Question 3

Euler's equation is applicable for

Accepted Answer

All of the above

Answer

Centrifugal compressor

Answer

Axial compressor

Answer

Pumps

Question 4

The compressor capacity is defined as the

Accepted Answer

Volume of air delivered by the compressor

Answer

Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

Answer

Volume of air sucked by the compressor during its suction stroke

Answer

None of the above

Question 5

In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

Accepted Answer

Isentropic compression

Answer

Isothermal compression

Answer

Polytropic compression

Answer

None of these

Question 6

In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

Accepted Answer

Isothermal compression

Answer

Isentropic compression

Answer

Polytropic compression

Answer

None of these

Question 7

In a centrifugal compressor, the flow of air is ________ to the axis of compressor.

Accepted Answer

Perpendicular

Answer

Parallel

Answer

Inclined

Answer

None of these

Question 8

The most efficient method of compressing air is to compress it

Accepted Answer

Isothermally

Answer

Adiabatically

Answer

Isentropically

Answer

Isochronically

Question 9

In a high pressure compressor, the delivery pressure is

Accepted Answer

8 to 10 bar

Answer

1 to 5 bar

Answer

5 to 8 bar

Answer

10 to 15 bar