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



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Instruction:

  • This is a FREE online test. DO NOT pay money to anyone to attend this test.
  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best :-).


1.

In a jet propulsion

A.
the propulsive matter is ejected from within the propelled body
B.
the propulsive matter is caused to flow around the propelled body
C.
its functioning does not depend upon presence of air
D.
none of the above

Your Answer: Option (Not Answered)

Correct Answer: Option B

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2.

The inlet pressure is always __________ the discharge pressure.

A.
equal to
B.
less than
C.
more than

Your Answer: Option (Not Answered)

Correct Answer: Option B

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3.

Which of the following statement is correct?

A.
The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
B.
The compression ratio for the compressor is always greater than unity.
C.
The compressor capacity is the ratio of workdone per cycle to the stroke volume.
D.
During isothermal compression of air, the workdone in a compressor is maximum.

Your Answer: Option (Not Answered)

Correct Answer: Option B

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4.

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

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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5.

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.

A.
equal to
B.
less than
C.
more than

Your Answer: Option (Not Answered)

Correct Answer: Option A

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6.

Only rocket engines can be propelled to space because

A.
they can generate very high thrust
B.
they have high propulsion efficiency
C.
these engines can work on several fuels
D.
they are not air-breathing engines

Your Answer: Option (Not Answered)

Correct Answer: Option D

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7.

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

A.
Agree
B.
Disagree

Your Answer: Option (Not Answered)

Correct Answer: Option A

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8.

The type of rotary compressor used in aeroplanes, is of

A.
centrifugal type
B.
axial flow type
C.
radial flow type
D.
none of these

Your Answer: Option (Not Answered)

Correct Answer: Option B

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9.

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

A.
thrust and range of aircraft
B.
efficiency of the engine
C.
both (a) and (b)
D.
none of these

Your Answer: Option (Not Answered)

Correct Answer: Option A

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10.

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

A.
equal to
B.
less than
C.
more than

Your Answer: Option (Not Answered)

Correct Answer: Option B

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11.

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

A.
Yes
B.
No

Your Answer: Option (Not Answered)

Correct Answer: Option A

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12.

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

A.
Yes
B.
No

Your Answer: Option (Not Answered)

Correct Answer: Option A

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13.

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

A.
isothermal compression
B.
isentropic compression
C.
polytropic compression
D.
none of these

Your Answer: Option (Not Answered)

Correct Answer: Option A

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14.

A centrifugal compressor is an axial flow compressor.

A.
Correct
B.
Incorrect

Your Answer: Option (Not Answered)

Correct Answer: Option B

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15.

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

A.
B.
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option B

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16.

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

A.
rγ - 1
B.
1 - rγ - 1
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option C

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17.

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

A.
0.2
B.
0.3
C.
0.4
D.
0.5

Your Answer: Option (Not Answered)

Correct Answer: Option D

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18.

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

A.
isothermal compression
B.
isentropic compression
C.
polytropic compression
D.
none of these

Your Answer: Option (Not Answered)

Correct Answer: Option B

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19.

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

A.
free air delivery
B.
compressor capacity
C.
swept volume
D.
none of these

Your Answer: Option (Not Answered)

Correct Answer: Option C

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20.

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

A.
radial flow compressor
B.
axial flow compressor
C.
roots blower
D.
reciprocating compressor

Your Answer: Option (Not Answered)

Correct Answer: Option A

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