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MCQs

Total Questions : 765 | Page 6 of 77 pages
Question 51. A closed cycle gas turbine consists of a
  1.    Compressor
  2.    Heating chamber
  3.    Cooling chamber
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 52. During base load operation, the best method of controlling compressor is
  1.    Start-stop motor
  2.    Constant speed unloader
  3.    Relief valve
  4.    Variable speed
 Discuss Question
Answer: Option A. -> Start-stop motor
Question 53. For an irreversible gas turbine cycle, the efficiency and work ratio both depend on
  1.    Pressure ratio alone
  2.    Maximum cycle temperature alone
  3.    Minimum cycle temperature alone
  4.    Both pressure ratio and maximum cycle temperature
 Discuss Question
Answer: Option D. -> Both pressure ratio and maximum cycle temperature
Question 54. For minimum work in multistage compression, assuming same index of compression in all stages
  1.    Work done in first stage should be more
  2.    Work done in subsequent stages should increase
  3.    Work done in subsequent stages should decrease
  4.    Work done in all stages should be equal
 Discuss Question
Answer: Option D. -> Work done in all stages should be equal
Question 55. In a single acting reciprocating air compressor, without clearance, the compression of air may be
  1.    Isothermal
  2.    Polytropic
  3.    Isentropic
  4.    Any one of these
 Discuss Question
Answer: Option D. -> Any one of these
Question 56. The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)
  1.    (v₁² -v₂²)/2g
  2.    (v₁ - v₂)²/2g
  3.    (v₁² -v₂²)/g
  4.    (v₁ - v₂)²/g
 Discuss Question
Answer: Option A. -> (v₁² -v₂²)/2g
Question 57. Euler's equation is applicable for
  1.    Centrifugal compressor
  2.    Axial compressor
  3.    Pumps
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 58. The compressor capacity is defined as the
  1.    Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
  2.    Volume of air delivered by the compressor
  3.    Volume of air sucked by the compressor during its suction stroke
  4.    None of the above
 Discuss Question
Answer: Option B. -> Volume of air delivered by the compressor
Question 59. In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during
  1.    Isothermal compression
  2.    Isentropic compression
  3.    Polytropic compression
  4.    None of these
 Discuss Question
Answer: Option A. -> Isothermal compression
Question 60. In a centrifugal compressor, the flow of air is ________ to the axis of compressor.
  1.    Parallel
  2.    Perpendicular
  3.    Inclined
  4.    None of these
 Discuss Question
Answer: Option B. -> Perpendicular

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