- A. Large discharge at high pressure
- B. Low discharge at high pressure
- C. Large discharge at low pressure
- D. Low discharge at low pressure
Compressors, Gas Turbines and Jet Engines
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Rotary compressors are suitable for_____.
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In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the_____.
- A. Thrust and range of aircraft
- B. Efficiency of the engine
- C. Both (A) and (B)
- D. None of these
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Inter cooling in compressors_____.
- A. Cools the delivered air
- B. Results in saving of power in compressing a given volume to given pressure
- C. Is the standard practice for big compressors
- D. Enables compression in two stages
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Which of the following fuels can be used in turbojet engines?
- A. Liquid hydrogen
- B. High speed diesel oil
- C. Kerosene
- D. Methyl alcohol
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An air compressor may be controlled by_____.
- A. Throttle control
- B. Clearance control
- C. Blow off control
- D. Any one of the above
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Reheating in multistage expansion gas turbine results in_____.
- A. High thermal efficiency
- B. Reduction in compressor work
- C. Decrease of heat loss in exhaust
- D. Maximum work output
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Isothermal compression efficiency can be attained by running the compressor_____.
- A. At very high speed
- B. At very slow speed
- C. At average speed
- D. At zero speed
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Ram compression in turbojet involves_____.
- A. Reduction of speed of incoming air and conversion of part of it into pressure energy
- B. Compression of inlet air
- C. Increasing speed of incoming air
- D. Lost work
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The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)
- A. W₁/(W₁ + W₂)
- B. W₂/(W₁ + W₂)
- C. (W₁ + W₂)/W₁
- D. (W₁ + W₂)/W₂
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Reheating in gas turbine results in_____.
- A. Increase of work ratio
- B. Decrease of thermal efficiency
- C. Decrease of work ratio
- D. Both (A) and (B) above