In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston
A. First stroke
B. Second Stroke
C. Third stroke
D. Fourth stroke
Answer B
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
The compressed air may be used
A. 10 - 40%
B. 40 - 60%
C. 60 - 70%
D. 70 - 90%
Answer D
A. in gas turbine plants
B. for operating pneumatic drills
C. in starting and supercharging of I.C. engines
D. all of the above
In a four stage compressor, if the pressure at the first and third stage are 1 bar and 16 bar, then the delivery pressure at the fourth stage will be
A. 1 bar
B. 16 bar
C. 64 bar
D. 256 bar
Explanation:
When we know that for multistage compressor P2/P1 = P3/P2 = P4/P3. Since P3 = 16, P1 = 1 so P2/P1 = P3/P2
then P2 = 4 also P3/P2 = P4/P3. 16/4 = P4/16. Answer C P4 = 64.
