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MCQs

Total Questions : 765 | Page 3 of 77 pages
Question 21. Reheating in multistage expansion gas turbine results in
  1.    High thermal efficiency
  2.    Reduction in compressor work
  3.    Decrease of heat loss in exhaust
  4.    Maximum work output
 Discuss Question
Answer: Option D. -> Maximum work output
Question 22. In turbo fan engine, the jet velocity as compared to turbojet engine is
  1.    Less
  2.    More
  3.    Same
  4.    May be less or more depending upon speed
 Discuss Question
Answer: Option A. -> Less
Question 23. Which is false statement about air receivers?
  1.    These are used to dampen pulsations
  2.    These act as reservoir to take care of sudden demands
  3.    These increase compressor efficiency
  4.    These knock out some oil and moisture
 Discuss Question
Answer: Option C. -> These increase compressor efficiency
Question 24. When air is to be compressed at a high pressure, then it is advantageous to use
  1.    Single stage compression
  2.    Multistage compression without intercooling
  3.    Multistage compression with intercooling
  4.    None of these
 Discuss Question
Answer: Option C. -> Multistage compression with intercooling
Question 25. For speed above 3000 km/hour, it is more advantageous to use
  1.    Turbojet engine
  2.    Ramjet engine
  3.    Propellers
  4.    Rockets
 Discuss Question
Answer: Option B. -> Ramjet engine
Question 26. Mining industry usually employs following motive power
  1.    A.C. electric motor
  2.    Compressed air
  3.    Petrol engine
  4.    Diesel engine
 Discuss Question
Answer: Option B. -> Compressed air
Question 27. If the flow of air through the compressor is perpendicular to its axis, then it is a
  1.    Reciprocating compressor
  2.    Centrifugal compressor
  3.    Axial flow compressor
  4.    Turbo compressor
 Discuss Question
Answer: Option B. -> Centrifugal compressor
Question 28. A rocket works with maximum overall efficiency when air craft velocity is equal to the
  1.    Jet velocity
  2.    Twice the jet velocity
  3.    Half the jet velocity
  4.    Average of the jet velocity
 Discuss Question
Answer: Option C. -> Half the jet velocity
Question 29. The volumetric efficiency of a compressor
  1.    Increases with decrease in compression ratio
  2.    Decreases with decrease in compression ratio
  3.    Increases with increase in compression ratio
  4.    Decreases with increase in compression ratio
 Discuss Question
Answer: Option D. -> Decreases with increase in compression ratio
Question 30. The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of
  1.    1: 1
  2.    2: 1
  3.    4: 1
  4.    1: 6
 Discuss Question
Answer: Option D. -> 1: 6

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