Compressor Quiz | Compressor Multiple Choice Questions and Answers

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Questions
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

Answer: slip factor
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
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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

Answer: 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

Answer: Less than
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%

Answer: 70 to 90%
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

Answer: Adiabatic
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

Answer: Free air
15 Aeroplanes employe following type of compressor.........
A Axial flow
B Combination of above
C Radial flow
D Centrifugal

Answer: Axial flow

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