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MCQs

Total Questions : 1342 | Page 1 of 135 pages
Question 1. The humidity ratio or specific humidity is the mass of water vapour present in
  1.     1 m3 of wet air
  2.     1 m3 of dry air
  3.     1 kg of wet air
  4.     1 kg of dry air
 Discuss Question
Answer: Option D. ->  1 kg of dry air
Explanation :
Question 2. The freezing point of r-12 is
  1.     -86.6°C
  2.     -95.2°C
  3.     -107.7°C
  4.     -135.8°C
 Discuss Question
Answer: Option D. ->  -135.8°C
Explanation :
Question 3. In mechanical refrigeration system, the refrigerant has the maximum temperature
  1.    In evaporator
  2.    Before expansion valve
  3.    Between compressor and condenser
  4.    Between condenser and evaporator
 Discuss Question
Answer: Option C. -> Between compressor and condenser
Question 4. In a vapour compression cycle, the refrigerant immediately after expansion valve is
  1.    Liquid
  2.    Sub-cooled liquid
  3.    Saturated liquid
  4.    Wet vapour
 Discuss Question
Answer: Option D. -> Wet vapour
Question 5. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
  1.    Heat dissipated to the surroundings
  2.    Heat stored in the human body
  3.    Sum of (A) and (B)
  4.    Difference of (A) and (B)
 Discuss Question
Answer: Option C. -> Sum of (A) and (B)
Question 6. The coefficient of performance of Heat Pump is always _________ one.
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    None of these
 Discuss Question
Answer: Option C. -> Greater than
Question 7. The domestic refrigerator uses following type of compressor
  1.    Centrifugal
  2.    Axial
  3.    Miniature sealed unit
  4.    Piston type reciprocating
 Discuss Question
Answer: Option D. -> Piston type reciprocating
Question 8. Nusselt number (NN) is given by
  1.    NN = hl/k
  2.    NN = μ cp/k
  3.    NN = ρ V l /μ
  4.    NN = V²/t.cp
 Discuss Question
Answer: Option A. -> NN = hl/k
Question 9. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
  1.    B.P.F. - 1
  2.    1 - B. P.F.
  3.    1/ B.P.F.
  4.    1 + B.P.F.
 Discuss Question
Answer: Option B. -> 1 - B. P.F.
Question 10. The undesirable property of a refrigerant is
  1.    Non-toxic
  2.    Non-flammable
  3.    Non-explosive
  4.    High boiling point
 Discuss Question
Answer: Option D. -> High boiling point

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