Questions
1
The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________.
Answer: slip factor
2
Vaneless diffusers are suitable for ___________.
Answer: only low pressure rise
3
How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor?
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
Answer: Axial flow compressors
5
The mass flow rate of air compressed in axial flow compressor is _____________centrifugal compressor.
Answer: higher than
6
Separators are generally installed in compressors......
Answer: After the intercooler
7
Ratio of compression is the ratio of.......
Answer: Absolute discharge pressure to the absolute intake pressure
8
The pressure of air at the beginning of the compression stroke is......atmospheric pressure
Answer: Less than
9
Volumetric efficiency of air compressors is of the order of.........
Answer: 70 to 90%
10
The ratio of indicated HP to shaft HP is known as.......
Answer: Mechanical efficiency
11
Ratio of indicated HP and break HP is known as.........
Answer: Mechanical efficiency
12
Maximum work is done in compressing air when the compression is......
Answer: Adiabatic
13
The ratio of work-done per cycle to the stroke volume of the compressor is known as.......
Answer: Mean effective pressure
14
The capacity of a compression is 10 m3/minute.10 m 3/minute refers to.......
Answer: Free air
