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Free download in PDF Compressor Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________.
[A]
slip factor
[B]
work factor
[C]
velocity factor
[D]
none of the above
(2)
Vaneless diffusers are suitable for ___________.
[A]
only low pressure rise
[B]
only high pressure rise
[C]
both low as well as high pressure rise
[D]
none
Answer: only low pressure rise
(3)
How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor?
[A]
Air velocity decreases in impeller and then increases in diffuser
[B]
Air velocity goes no increasing in impeller followed by diffuser
[C]
Air velocity goes no decreasing in impeller followed by diffuser
[D]
Air velocity increases in impeller and then decreases in diffuser
Answer: Air velocity increases in impeller and then decreases in diffuser
(4)
Which compressors are suitable for large volume flow rates of above 1200 m3/min
[A]
Centrifugal compressors
[B]
Axial flow compressors
[C]
Both a. and b.
[D]
None of the above
Answer: Axial flow compressors
(5)
The mass flow rate of air compressed in axial flow compressor is _____________centrifugal compressor.
[A]
unpredictable
[B]
lower than
[C]
same as
[D]
higher than
(6)
Separators are generally installed in compressors......
[A]
After the intercooler
[B]
Before the intercooler
[C]
Before the receiver
[D]
None of the above
Answer: After the intercooler
(7)
Ratio of compression is the ratio of.......
[A]
Stroke Volume and clearance volume
[B]
Gauge discharge pressure to the gauge intake pressure
[C]
Absolute discharge pressure to the absolute intake pressure
[D]
None of the above
Answer: Absolute discharge pressure to the absolute intake pressure
(8)
The pressure of air at the beginning of the compression stroke is......atmospheric pressure
[A]
Less than
[B]
More than
[C]
Equal to
[D]
None of the above
(9)
Volumetric efficiency of air compressors is of the order of.........
[A]
70 to 90%
[B]
60 to 70%
[C]
20 to 30%
[D]
40 to 50%
(10)
The ratio of indicated HP to shaft HP is known as.......
[A]
Volumetric efficiency
[B]
Mechanical efficiency
[C]
Compressor efficiency
[D]
None of the above
Answer: Mechanical efficiency
(11)
Ratio of indicated HP and break HP is known as.........
[A]
Mechanical efficiency
[B]
Adiabatic efficiency
[C]
Volumetric efficiency
[D]
None of the above
Answer: Mechanical efficiency
(12)
Maximum work is done in compressing air when the compression is......
[A]
Adiabatic
[B]
Polytropic
[C]
Isothermal
[D]
Any of the above
(13)
The ratio of work-done per cycle to the stroke volume of the compressor is known as.......
[A]
Compressor efficiency
[B]
Mean effective pressure
[C]
Compressor capacity
[D]
None of the above
Answer: Mean effective pressure
(14)
The capacity of a compression is 10 m3/minute.10 m 3/minute refers to.......
[A]
Free air
[B]
Standard air
[C]
Compressed air at delivery pressure
[D]
None of the above
(15)
Aeroplanes employe following type of compressor.........
[A]
Axial flow
[B]
Combination of above
[C]
Radial flow
[D]
Centrifugal
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