Online Mechanical Engineering Test - Compressors, Gas Dynamics and Gas Turbines Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The inlet pressure is always __________ the discharge pressure.

equal to

less than

more than

[#]

Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.

True

False

[#]

Which of the following statement is correct?

The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.

The compression ratio for the compressor is always greater than unity.

The compressor capacity is the ratio of workdone per cycle to the stroke volume.

During isothermal compression of air, the workdone in a compressor is maximum.

[#]

When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

equal to

less than

more than

[#]

The increase in pressure in a roots blower is entirely due to back flow of air.

Agree

Disagree

[#]

The type of rotary compressor used in aeroplanes, is of

centrifugal type

axial flow type

radial flow type

none of these

[#]

In a jet propulsion

the propulsive matter is ejected from within the propelled body

the propulsive matter is caused to flow around the propelled body

its functioning does not depend upon presence of air

none of the above

[#]

Only rocket engines can be propelled to space because

they can generate very high thrust

they have high propulsion efficiency

these engines can work on several fuels

they are not air-breathing engines

[#]

The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.

equal to

less than

more than

[#]

10.

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

thrust and range of aircraft

efficiency of the engine

both (a) and (b)

none of these

[#]

11.

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

isothermal compression

isentropic compression

polytropic compression

none of these

[#]

12.

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

isothermal compression

isentropic compression

polytropic compression

none of these

[#]

13.

If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

[#]

14.

A centrifugal compressor is an axial flow compressor.

Correct

Incorrect

[#]

15.

The ratio of the isentropic work to the Euler's work is known as pressure coefficient.

Yes

[#]

16.

The degree of reaction is usually kept __________ for all types of axial flow compressors.

0.2

0.3

0.4

0.5

[#]

17.

The basic principle of the rocket propulsion is the same as that of jet propulsion.

Yes

[#]

18.

The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

r^{γ - 1}

1 - r^{γ - 1}

[#]

19.

The volume of air sucked by the compressor during its suction stroke is called

free air delivery

compressor capacity

swept volume

none of these

[#]

20.

A compressor mostly used for supercharging of I.C. engines is

radial flow compressor

axial flow compressor

roots blower

reciprocating compressor

[#]

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Online Mechanical Engineering Test - Compressors, Gas Dynamics and Gas Turbines Test

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