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MCQs

Total Questions : 765 | Page 8 of 77 pages
Question 71. For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)
  1.    (p₁ - p₂)/2
  2.    (p₁ + p₂)/2
  3.    p₁/p₂
  4.    p₁ p₂
 Discuss Question
Answer: Option D. -> p₁ p₂
Question 72. The efficiency and work ratio of a gas turbine plant can be increased by
  1.    Adding heat exchanger
  2.    Injecting water in/around combustion chamber
  3.    Reheating the air after partial expansion in the turbine
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 73. Inter-cooling in multistage compressors is done
  1.    To cool the air during compression
  2.    To cool the air at delivery
  3.    To enable compression in two stages
  4.    To minimize the work of compression
 Discuss Question
Answer: Option D. -> To minimize the work of compression
Question 74. The thrust of a jet propulsion power unit can be increased by
  1.    Injecting water into the compressor
  2.    Burning fuel after gas turbine
  3.    Injecting ammonia into the combustion chamber
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 75. Euler's equation can be used for
  1.    Radial flow compressors
  2.    Axial flow compressors
  3.    Pumps
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 76. Adiabatic compression is one in which
  1.    Temperature during compression remains constant
  2.    No heat leaves or enters the compressor cylinder during compression
  3.    Temperature rise follows a linear relationship
  4.    Work done is maximum
 Discuss Question
Answer: Option B. -> No heat leaves or enters the compressor cylinder during compression
Question 77. Ratio of compression is the ratio of
  1.    Gauge discharge pressure to the gauge intake pressure
  2.    Absolute discharge pressure to the absolute intake pressure
  3.    Pressures at discharge and suction corresponding to same temperature
  4.    Stroke volume and clearance volume
 Discuss Question
Answer: Option B. -> Absolute discharge pressure to the absolute intake pressure
Question 78. The efficiency of roots blower ________ with the increase in pressure ratio.
  1.    Decreases
  2.    Increases
  3.    Does not change
  4.    None of these
 Discuss Question
Answer: Option A. -> Decreases
Question 79. The work done per unit mass of air in compression will be least when 'n' is equal to
  1.    1
  2.    1.2
  3.    1.3
  4.    1.4
 Discuss Question
Answer: Option A. -> 1
Question 80. During peak load periods, the best method of controlling compressors is
  1.    Start-stop motor
  2.    Constant speed unloader
  3.    Relief valve
  4.    Variable speed
 Discuss Question
Answer: Option B. -> Constant speed unloader

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