Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
The increase in pressure in a roots blower is entirely due to back flow of air.
Options- A. Agree
- B. Disagree
- Correct Answer
- Agree
- 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
- 2. In diesel engines, the fuel is injected in the form of very fine spray, into the engine cylinder, which gets ignited due to high temperature of the compressed air.
Options- A. Agree
- B. Disagree Discuss
- 3. The thermal efficiency of diesel engines on weak mixtures is
Options- A. unaffected
- B. lower
- C. higher
- D. dependent on other factors Discuss
- 4. Reactors for propulsion applications are designed for
Options- A. any form of uranium
- B. natura uranium
- C. enriched uranium
- D. plutonium Discuss
- 5. The detonating tendency in petrol engines increases with increase of compression ratio.
Options- A. True
- B. False Discuss
- 6. 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
- 7. 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
- 8. The compression ratio in a gas turbine is
Options- A. 4
- B. 1
- C. 9
- D. 12 Discuss
- 9. 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
- 10. 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
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: they are not air-breathing engines
Correct Answer: Agree
Correct Answer: higher
Correct Answer: enriched uranium
Correct Answer: True
Correct Answer: one-half
Correct Answer: rotor to static enthalpy rise in the stage
Correct Answer: 1
Correct Answer: compressor capacity
Correct Answer: all of the above
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