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MCQs

Total Questions : 1342 | Page 9 of 135 pages
Question 81. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
  1.    Condenser
  2.    Evaporator
  3.    Absorber
  4.    None of these
 Discuss Question
Answer: Option A. -> Condenser
Question 82. Air refrigeration operates on
  1.    Carnot cycle
  2.    Reversed Carnot cycle
  3.    Rankine’s cycle
  4.    Brayton cycle
 Discuss Question
Answer: Option D. -> Brayton cycle
Question 83. The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the working substance receives heat, T₂ = Temperature of cooling water, and T₃ = Evaporator temperature)
  1.    [T₁ (T₂ - T₃)] / [T₃ (T₁ - T₂)]
  2.    [T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)]
  3.    [T₁ (T₁ - T₂)] / [T₃ (T₂ - T₃)]
  4.    [T₃ (T₂ - T₃)] / [T₁ (T₁ - T₂)]
 Discuss Question
Answer: Option B. -> [T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)]
Question 84. Critical temperature is the temperature above which
  1.    A gas will never liquefy
  2.    A gas will immediately liquefy
  3.    Water will evaporate
  4.    Water will never evaporate
 Discuss Question
Answer: Option A. -> A gas will never liquefy
Question 85. The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
  1.    Mean radiant temperature
  2.    Effective temperature
  3.    Dew point temperature
  4.    None of these
 Discuss Question
Answer: Option B. -> Effective temperature
Question 86. The mass of water vapour present in __________ is called absolute humidity.
  1.    1 m3 of water
  2.    1 m3 of dry air
  3.    1 kg of wet air
  4.    1 kg of dry air
 Discuss Question
Answer: Option B. -> 1 m3 of dry air
Question 87. An Electrolux refrigerator is called a _________ absorption system.
  1.    Single fluid
  2.    Two fluids
  3.    Three fluids
  4.    None of these
 Discuss Question
Answer: Option C. -> Three fluids
Question 88. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
  1.    Equal to
  2.    Less than
  3.    More than
  4.    None of these
 Discuss Question
Answer: Option B. -> Less than
Question 89. As relative humidity decreases, the dew point temperature will be ________ wet bulb temperature.
  1.    Same as
  2.    Lower than
  3.    Higher than
  4.    None of these
 Discuss Question
Answer: Option B. -> Lower than
Question 90. The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.
  1.    Same as
  2.    Lower than
  3.    Higher than
  4.    None of these
 Discuss Question
Answer: Option A. -> Same as

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