Compressors, Gas Dynamics and Gas Turbines problems
- 1. In axial flow compressor, exit flow angle deviation from the blade angle is a function of
Options- A. blade camber
- B. blade camber and incidence angle
- C. space-chord ratio
- D. blade camber and space-chord ratio Discuss
Correct Answer: blade camber and incidence angle
- 2. In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston.
Options- A. one stroke
- B. two strokes
- C. three strokes
- D. four strokes Discuss
Correct Answer: two strokes
- 3. In a reciprocating air compressor, the compression work per kg of air
Options- A. increases as clearance volume increases
- B. decreases as clearance volume increases
- C. is independent of clearance volume
- D. increases as clearance volume decreases Discuss
Correct Answer: is independent of clearance volume
- 4. The inlet pressure is always __________ the discharge pressure.
Options- A. equal to
- B. less than
- C. more than Discuss
Correct Answer: less than
- 5. The volumetric efficiency for reciprocating air compressors is about
Options- A. 10 to 40%
- B. 40 to 60%
- C. 60 to 70%
- D. 70 to 90% Discuss
Correct Answer: 70 to 90%
- 6. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 7. The maximum delivery pressure in a rotary air compressor is
Options- A. 10 bar
- B. 20 bar
- C. 30 bar
- D. 50 bar Discuss
Correct Answer: 10 bar
- 8. Gas turbine as compared to steam turbine
Options- A. requires less space for installation
- B. has compressor and combustion chamber
- C. has less efficiency
- D. all of these Discuss
Correct Answer: all of these
- 9. Which of the following statement is wrong?
Options- A. In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
- B. The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
- C. The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
- D. none of the above Discuss
Correct Answer: none of the above
- 10. In the aircraft propellers
Options- 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 the presence of air
- D. none of the above Discuss
Correct Answer: the propulsive matter is ejected from within the propelled body
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