Compressors, Gas Dynamics and Gas Turbines problems
- 1. Only rocket engines can be propelled to space because
Options- A. they can generate very high thrust
- B. they have high propulsion efficiency
- C. these engines can work on several fuels
- D. they are not air-breathing engines Discuss
Correct Answer: they are not air-breathing engines
- 2. The increase in pressure in a roots blower is entirely due to back flow of air.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 3. A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
Options- A. equal to
- B. one-half
- C. double Discuss
Correct Answer: one-half
- 4. The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
Options- A. rotor to static enthalpy rise in the stator
- B. stator to static enthalpy rise in the rotor
- C. rotor to static enthalpy rise in the stage
- D. stator to static enthalpy rise in the stage Discuss
Correct Answer: rotor to static enthalpy rise in the stage
- 5. The compression ratio in a gas turbine is
Options- A. 4
- B. 1
- C. 9
- D. 12 Discuss
Correct Answer: 1
- 6. The volume of air delivered by the compressor is called
Options- A. free air delivery
- B. compressor capacity
- C. swept volume
- D. none of these Discuss
Correct Answer: compressor capacity
- 7. The compressed air may be used
Options- A. in gas turbine plants
- B. for operating pneumatic drills
- C. in starting and supercharging of I.C. engines
- D. all of the above Discuss
Correct Answer: all of the above
- 8. The ratio of workdone per cycle to the stroke volume of the compressor is known as
Options- A. compressor capacity
- B. compression ratio
- C. compressor efficiency
- D. mean effective pressure Discuss
Correct Answer: mean effective pressure
- 9. Which of the following statement is correct?
Options- A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
- B. The compression ratio for the compressor is always greater than unity.
- C. The compressor capacity is the ratio of workdone per cycle to the stroke volume.
- D. During isothermal compression of air, the workdone in a compressor is maximum. Discuss
Correct Answer: The compression ratio for the compressor is always greater than unity.
- 10. The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
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