The ratio of high temperature to low temperature for reversed Carnot refrigerator is 1.25. The COP will be
A.2
B.3
C.4
D.5
Category: Refrigeration and Air conditioning Mcqs
Capacity of a domestic refrigerator is in the range
A.0.1 to 0.3 tonnes
B.1 to 3 tonnes
C.3 to 5 tonnes
D.5 to 7 tonnes
E.7 to 10 tonnes
In cooling towers the heat is dissipated mainly by
A.Radiation
B.Convection
C.Conduction
D.Evaporation
E.Freezing
Which type of compressor is commonly used in room air-conditioner
A.Reciprocating
B.Rotory
C.Screw
D.Centrifugal
E.None of the above
Which refrigerant has the highest critical point temperature?
A.Ammonia
B.Freon 11
C.Freon 12
D.Freon 22
E.None of the above
Anhydrous substance is
A.Free of hydrogen
B.Free of hydrogen and other chemicals containing hydrogen
C.Free of water especially water of crystallization
D.Free of humidity
E.Dry substance
The coefficient of performance of a domestic refrigerator as compared to that of an air conditioner is gererally
A.More
B.Same
C.Less
D.Air conditioner performance depends on whether conditions
E.Cannot be compared
In a refrigeration cycle the heat is rejected by refrigerant at
A.Evaporator
B.Condenser
C.Expansion valve
D.Compressor
E.All of the above
In a small vapour compression cycle using capillary tubing for expansion, if suddenly uncondensed vapours enter the tubing, the result will be
A.Improved refrigerating capacity
B.Loss in refrigerating capacity
C.Supply of superheated vapour to compressor
D.Choking of drier
E.All of the above
In a psychrometric chart horizontal line indicate
A.Dry bulb temperature
B.Wet bulb temperature
C.Dew point temperature
D.Percentage humidity
E.Relative humidity
