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MCQs

Total Questions : 1342 | Page 134 of 135 pages
Question 1331. In a vapour compression cycle, the refrigerant immediately after expansion valve is
  1.    Saturated liquid
  2.    Wet vapour
  3.    Sub-cooled liquid
  4.    Liquid
 Discuss Question
Answer: Option B. -> Wet vapour
Question 1332. 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.    (td₃ - td₁)/(td₃ - td₂)
  2.    (td₃ - td₂)/(td₃ - td₁)
  3.    (td₂ - td₃)/(td₃ - td₁)
  4.    (td₃ - td₁)/(td₂ - td₃)
 Discuss Question
Answer: Option B. -> (td₃ - td₂)/(td₃ - td₁)
Question 1333. 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.    1.2
  2.    0.2
  3.    6
  4.    5
 Discuss Question
Answer: Option D. -> 5
Question 1334. The domestic refrigerator uses following type of compressor
  1.    Piston type reciprocating
  2.    Centrifugal
  3.    Axial
  4.    Miniature sealed unit
 Discuss Question
Answer: Option A. -> Piston type reciprocating
Question 1335. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
  1.    Heat stored in the human body
  2.    Difference of (A) and (B)
  3.    Sum of (A) and (B)
  4.    Heat dissipated to the surroundings
 Discuss Question
Answer: Option C. -> Sum of (A) and (B)
Question 1336. The freezing point of R-12 is
  1.    -135.8°C
  2.    -95.2°C
  3.    -86.6°C
  4.    -107.7°C
 Discuss Question
Answer: Option A. -> -135.8°C
Question 1337. The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by
  1.    O.P)R - 1
  2.    O.P)P = (
  3.    (
  4.    O.P.)P = (
  5.    O.P)R
  6.    (
  7.    O.P)P = (
  8.    O.P.)R + 2
  9.    O.P.)R + 1
  10.    (
  11.    (
  12.    O.P.)P = (
 Discuss Question
Answer: Option A. -> O.P)R - 1
Question 1338. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration
  1.    2 to 5 h.p. per ton of refrigeration
  2.    1 to 2 h.p. per ton of refrigeration
  3.    0.5 to 0.8 h.p. per ton of refrigeration
  4.    0.1 to 0.5 h.p. per ton of refrigeration
 Discuss Question
Answer: Option B. -> 1 to 2 h.p. per ton of refrigeration
Question 1339. 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 1340. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
  1.    Condenser
  2.    Absorber
  3.    Evaporator
  4.    None of these
 Discuss Question
Answer: Option A. -> Condenser

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