Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
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
- Correct Answer
- blade camber and incidence angle
- 1. 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
Options- A. 1 bar
- B. 16 bar
- C. 64 bar
- D. 256 bar Discuss
- 2. If p1, is the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)
Options- A. D1/D2 = p1p2
- B. D1/D2 = p1/p2
- C. D1/D2 = p2/p1
- D. none of these Discuss
- 3. High air-fuel ratio in gas turbines
Options- A. increases power output
- B. improves thermal efficiency
- C. reduces exhaust temperature
- D. do not damage turbine blades Discuss
- 4. The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air.
Options- A. True
- B. False Discuss
- 5. In a centrifugal compressor, an increase in speed at a given pressure ratio causes
Options- A. increase in flow
- B. decrease in flow
- C. increase in efficiency
- D. increase in flow and decrease in efficiency Discuss
- 6. 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
- 7. 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
- 8. The inlet pressure is always __________ the discharge pressure.
Options- A. equal to
- B. less than
- C. more than Discuss
- 9. 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
- 10. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.
Options- A. Correct
- B. Incorrect Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: 64 bar
Correct Answer: D1/D2 = p2/p1
Correct Answer: reduces exhaust temperature
Correct Answer: True
Correct Answer: increase in flow and decrease in efficiency
Correct Answer: two strokes
Correct Answer: is independent of clearance volume
Correct Answer: less than
Correct Answer: 70 to 90%
Correct Answer: Correct
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