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MCQs

Total Questions : 1342 | Page 11 of 135 pages
Question 101. Choose the correct statement
  1.    A refrigerant should have low latent heat
  2.    If operating temperature of system is low, then refrigerant with low boiling point should be used
  3.    Pre-cooling and sub-cooling bf refrigerant are same
  4.    Superheat and sensible heat of a refrigerant are same
 Discuss Question
Answer: Option B. -> If operating temperature of system is low, then refrigerant with low boiling point should be used
Question 102. The C.O.P. of a heat pump working on a reversed Carnot cycle is
  1.    T₁/(T₂ - T₁)
  2.    (T₂ - T₁)/T₁
  3.    (T₁ - T₂)/T₁
  4.    T₂/(T₂ - T₁)
 Discuss Question
Answer: Option D. -> T₂/(T₂ - T₁)
Question 103. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
  1.    Wet vapour region
  2.    Superheated vapour region
  3.    Sub-cooled liquid region
  4.    None of these
 Discuss Question
Answer: Option C. -> Sub-cooled liquid region
Question 104. Critical pressure of a liquid is the pressure
  1.    Above which liquid will remain liquid
  2.    Above which liquid becomes gas
  3.    Above which liquid becomes vapour
  4.    Above which liquid becomes solid
 Discuss Question
Answer: Option A. -> Above which liquid will remain liquid
Question 105. The lowest thermal diffusivity is of
  1.    Iron
  2.    Lead
  3.    Aluminium
  4.    Rubber
 Discuss Question
Answer: Option D. -> Rubber
Question 106. The central air conditioning system has ___________ overall efficiency as compared to individual systems.
  1.    Same
  2.    Lower
  3.    Higher
  4.    None of these
 Discuss Question
Answer: Option C. -> Higher
Question 107. For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
  1.    Zero
  2.    20
  3.    50
  4.    100
 Discuss Question
Answer: Option D. -> 100
Question 108. The vapour compression refrigerator employs the following cycle
  1.    Rankine
  2.    Carnot
  3.    Reversed Rankine
  4.    Reversed Carnot
 Discuss Question
Answer: Option D. -> Reversed Carnot
Question 109. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is
  1.    0.376
  2.    0.4
  3.    0.6
  4.    0.67
 Discuss Question
Answer: Option C. -> 0.6
Question 110. During heating and humidification, the final relative humidity of air
  1.    Can be lower or higher than that of the entering air
  2.    Is lower than that of the entering air
  3.    Is higher than that of the entering air
  4.    None of the above
 Discuss Question
Answer: Option A. -> Can be lower or higher than that of the entering air

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