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MCQs

Total Questions : 164 | Page 3 of 17 pages
Question 21. Which of the following statement is correct?
  1.    The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
  2.    The compression ratio for the compressor is always greater than unity.
  3.    The compressor capacity is the ratio of workdone per cycle to the stroke volume.
  4.    During isothermal compression of air, the workdone in a compressor is maximum.
 Discuss Question
Answer: Option B. -> The compression ratio for the compressor is always greater than unity.
Answer: (b).The compression ratio for the compressor is always greater than unity.
Question 22. The efficiency of a jet engine is higher at
  1.    low speeds
  2.    high speeds
  3.    low altitudes
  4.    high altitudes
 Discuss Question
Answer: Option D. -> high altitudes
Answer: (d).high altitudes
Question 23. In the aircraft propellers
  1.    the propulsive matter is ejected from within the propelled body
  2.    the propulsive matter is caused to flow around the propelled body
  3.    its functioning does not depend upon the presence of air
  4.    none of the above
 Discuss Question
Answer: Option A. -> the propulsive matter is ejected from within the propelled body
Answer: (a).the propulsive matter is ejected from within the propelled body
Question 24. The volume of air delivered by the compressor is called
  1.    free air delivery
  2.    compressor capacity
  3.    swept volume
  4.    none of these
 Discuss Question
Answer: Option B. -> compressor capacity
Answer: (b).compressor capacity
Question 25. The type of rotary compressor used in gas turbines, is of
  1.    centrifugal type
  2.    axial flow type
  3.    radial flow type
  4.    none of these
 Discuss Question
Answer: Option B. -> axial flow type
Answer: (b).axial flow type
Question 26. The velocity of air entering in a rocket is __________ as compared to an aircraft.
  1.    zero
  2.    less
  3.    more
  4.    same
 Discuss Question
Answer: Option A. -> zero
Answer: (a).zero
Question 27. A compressor mostly used for supercharging of I.C. engines is
  1.    radial flow compressor
  2.    axial flow compressor
  3.    roots blower
  4.    reciprocating compressor
 Discuss Question
Answer: Option A. -> radial flow compressor
Answer: (a).radial flow compressor
Question 28. In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into
  1.    atmosphere
  2.    vacuum
  3.    discharge nozzle
  4.    back to the compressor
 Discuss Question
Answer: Option C. -> discharge nozzle
Answer: (c).discharge nozzle
Question 29. The workdone on a compressor will be minimum if air is taken from
  1.    the atmosphere
  2.    a source at 0° C
  3.    a source of low temperature air
  4.    a source of high temperature air
 Discuss Question
Answer: Option C. -> a source of low temperature air
Answer: (c).a source of low temperature air
Question 30. The multi-stage compression ofair as compared to single stage compression
  1.    improves volumetric efficiency for the given pressure ratio
  2.    reduces workdone per kg of air
  3.    gives more uniform torque
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these

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