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RVUNL ME || Refrigeration and Air-Conditioning || Quiz 1
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Question 1
The power required per ton of refrigeration is 0.35 kW. Find the heat rejection ratio _________?
Question 2
In an ideal VCR cycle of used R- 134A as refrigerant used as a heat pump. The enthalpy at inlet to compressor and exit of compressor are 110kJ/kg and 235kJ/kg respectively. The enthalpy at exit of condenser is 95kJ/kg. If work input to compressor in 5kW then calculate rate of heat extraction from evaporator(kW) and COP of heat pump.
Question 3
In vapour compression refrigeration system, refrigeration effect is 40 kJ/kg and COP of the system is 4. Find heat rejected in the condenser.
Question 4
In an ideal vapour compression refrigeration cycle, the enthalpy of the refrigrator before and after the evaporator are respectively 200 kJ/kg and 300 kJ/kg. The circulation rate of the refrigerant (in kg/min) for each 200 kJ/min of refrigeration is
Question 5
The COP of a cascade refrigeration system is______
where
represents the COP of 1st refrigeration system and 
represents COP of 2nd refrigeration system.
where
represents the COP of 1st refrigeration system and represents COP of 2nd refrigeration system.Question 6
In Water lithium bromide vapour absorption cycle, lithium bromide is used as
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