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Refrigeration Air Conditioning
Advanced Refrigeration
Quiz 1
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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?
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
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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