Q.1
The net effect of superheating is to have ________ COP.
  • a) higher
  • b) lower
  • c) moderate
  • d) higher or lower depending on the refrigerant used
Q.2
The COP of vapor compression when vapor is superheated after compression having refrigeration effect (Re) ofand work done (W) ofis?
  • a) 8
  • b) 6.7
  • c) 7.8
  • d) 9
Q.3
What is the mass flow rate of the refrigerant when the heat required isMJ/hr, enthalpy at discharge H2 is 434.5 KJ/kg and enthalpy of liquid Hf3 in KJ/kg at point 3 in p-h diagram is 271.97?
  • a) 10.254 kg/hr
  • b) 15.56 kg/hr
  • c) 10.254 kg/min
  • d) 15.56 kg/min
Q.4
The cycle in which the evaporation starts at point 4 and continues up to point 1 where it is dry-saturated is called?
Questionrefrigeration-air-conditioning-questions-answers4.jpg
  • a) Theoretical VCR with dry vapor compression
  • b) Theoretical VCR with wet vapor compression
  • c) Theoretical VCR with super – heated vapor after compression
  • d) Theoretical VCR with super – heated vapor before compression
Q.5
What is the COP of performance of the plant when the vapor is superheated 5 degree C before entering the compressor and
Questionrefrigeration-air-conditioning-questions-answers5.jpg
  • a) 5.7
  • b) 4.8
  • c) 4.7
  • d) 3.5
Q.6
In domestic vapor compression refrigeration, the refrigerant commonly used is?
  • a) Freon – 12
  • b) CO2
  • c) H2O
  • d) Ammonia
Q.7
Superheating before compression increases the refrigeration effect.
  • a) True
  • b) False
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