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MCQs

Total Questions : 1342 | Page 4 of 135 pages
Question 31. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
  1.    decreases
  2.    increases
  3.    remains same
  4.    depends on other factors
 Discuss Question
Answer: Option B. -> increases
Question 32. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be
  1.    0.2
  2.    1.2
  3.    5
  4.    6
 Discuss Question
Answer: Option C. -> 5
Question 33. The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)
  1.    (td₂ - td₃)/(td₃ - td₁)
  2.    (td₃ - td₂)/(td₃ - td₁)
  3.    (td₃ - td₁)/(td₂ - td₃)
  4.    (td₃ - td₁)/(td₃ - td₂)
 Discuss Question
Answer: Option B. -> (td₃ - td₂)/(td₃ - td₁)
Question 34. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration
  1.    0.1 to 0.5 h.p. per ton of refrigeration
  2.    0.5 to 0.8 h.p. per ton of refrigeration
  3.    1 to 2 h.p. per ton of refrigeration
  4.    2 to 5 h.p. per ton of refrigeration
 Discuss Question
Answer: Option C. -> 1 to 2 h.p. per ton of refrigeration
Question 35. The freezing point of R-12 is
  1.    -86.6°C
  2.    -95.2°C
  3.    -107.7°C
  4.    -157.7°C
 Discuss Question
Answer: Option D. -> -157.7°C
Question 36. The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by
  1.    (C.O.P.)P = (C.O.P.)R + 2
  2.    (C.O.P.)P = (C.O.P.)R + 1
  3.    (C.O.P)P = (C.O.P)R - 1
  4.    (C.O.P)P = (C.O.P)R
 Discuss Question
Answer: Option B. -> (C.O.P.)P = (C.O.P.)R + 1
Question 37. During a refrigeration cycle, heat is rejected by the refrigerant in a
  1.    Compressor
  2.    Condenser
  3.    Evaporator
  4.    Expansion valve
 Discuss Question
Answer: Option B. -> Condenser
Question 38. Freon group of refrigerants are
  1.    Inflammable
  2.    Toxic
  3.    Non-inflammable and toxic
  4.    Nontoxic and non-inflammable
 Discuss Question
Answer: Option D. -> Nontoxic and non-inflammable
Question 39. The Freon group of refrigerants are
  1.    Halocarbon refrigerants
  2.    Zoetrope refrigerants
  3.    Inorganic refrigerants
  4.    Hydrocarbon refrigerants
 Discuss Question
Answer: Option A. -> Halocarbon refrigerants
Question 40. One ton of the refrigeration is
  1.    The standard unit used in refrigeration problems
  2.    The cooling effect produced by melting 1 ton of ice
  3.    The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
  4.    The refrigeration effect to produce 1 ton of ice at NTP conditions
 Discuss Question
Answer: Option C. -> The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

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