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