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MCQs

Laws Of Thermodynamics

Total Questions : 1462 | Page 9 of 147 pages
Question 81. The unit of power in S.I. units is kilowatt.
  1.    True
  2.    False
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 82. The increase in entropy of a system represents
  1.    increase in availability of energy
  2.    increase in temperature
  3.    decrease in pressure
  4.    degradation of energy
 Discuss Question
Answer: Option D. -> degradation of energy
Answer: (d).degradation of energy
Question 83. In a free expansion process,
  1.    W1 - 2 = 0
  2.    Q1 - 2 = 0
  3.    dU = 0
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 84. Which of the following gas has the highest calorific value?
  1.    Coal gas
  2.    Producer gas
  3.    Mond gas
  4.    Blast furnace gas
 Discuss Question
Answer: Option A. -> Coal gas
Answer: (a).Coal gas
Question 85. When the gas is cooled at constant pressure,
  1.    its temperature increases but volume decreases
  2.    its volume increases but temperature decreases
  3.    both temperature and volume increases
  4.    both temperature and volume decreases
 Discuss Question
Answer: Option D. -> both temperature and volume decreases
Answer: (d).both temperature and volume decreases
Question 86. The oxygen atom is __________ times heavier than the hydrogen atom.
  1.    2
  2.    4
  3.    8
  4.    16
 Discuss Question
Answer: Option D. -> 16
Answer: (d).16
Question 87. The work ratio of a gas turbine plant is given by
  1.    (Net work output)/(Work-done by the turbine)
  2.    (Net work output)/(Heat supplied)
  3.    (Actual temperature drop)/(Isentropic temperature drop)
  4.    (Isentropic increase in temperature)/(Actual increase in temperature)
 Discuss Question
Answer: Option A. -> (Net work output)/(Work-done by the turbine)
Answer: (a).(Net work output)/(Work-done by the turbine)
Question 88. As per Charles' law, the volume of a given mass of a perfect gas varies __________ as its absolute temperature, when the absolute pressure remains constant.
  1.    directly
  2.    indirectly
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> directly
Answer: (a).directly
Question 89. The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
  1.    pv = mRT
  2.    pv = RTm
  3.    pvm = C
  4.    pv = (RT)m
 Discuss Question
Answer: Option A. -> pv = mRT
Answer: (a).pv = mRT
Question 90. Select the wrong statement
  1.    A Joule cycle consists of two constant volume and two isentropic processes.
  2.    An Otto cycle consists of two constant volume and two isentropic processes.
  3.    An Ericsson cycle consists of two constant pressure and two isothermal processes.
  4.    all of the above
 Discuss Question
Answer: Option A. -> A Joule cycle consists of two constant volume and two isentropic processes.
Answer: (a).A Joule cycle consists of two constant volume and two isentropic processes.

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