During compression in a vapour compression cycle of the refrigerant is super heated
A.C.O.P. is reduced
B.C.O.P. is increased
C.Work done is reduced
D.Refrigerating effect is reduced
E.None of the above
Category: Refrigeration and Air conditioning Mcqs
The condition of refrigerant before and after the expansion or throttle valve in a vapour compression system is
A.Wet vapour, very wet vapour
B.Wet vapour, dry vapour
C.High pressure saturated liquid, very wet vapour
D.Very wet vapour, high pressure, saturated liquid
E.None of the above
In electrolus refrigerator
A.Ammonia is absorbed in water
B.Ammonia is absorbed in hydrogen
C.Hydrogen is absorbed in water
D.Ammonia evaporates in hydrogen
E.Hydrogen evaporates in ammonia
The difference between wet and dry bulb temperatures
A.Increases at atmospheric temperature
B.Increases as air gets wet
C.Increases as air gets drier
D.remains constant always
E.None of the above
When Freon 12 is the refrigerant, the condenser and evaporator cables are made of
A.Steel
B.Wrought iron
C.Cast iron
D.Copper
E.Aluminium
A Salinometer
A.Measures temperatures in cryogenic regions
B.Measure intensity of illumination
C.Measures sound level
D.Measures density of brine
E.Measures solar radiation
In ammonia vapour compression system the temperature rise between the condenser outlet and the expansion valve should be
A.As high as possible to improve the performance
B.As high as possible to reduce motor power inputs
C.As little as possible for better performance
D.Anything as it has no bearing on the performance of system
E.None of the above
In vapour absorption system the function of rectifier is
A.To cool the vapour leaving the analyzer
B.To separate ammonia and water
C.To dissolve ammonia in water
D.To add energy from external source
E.None of the above
Which of the following refrigerant has the lowest specific volume?
A.Freon 12
B.Freon 22
C.Carbondioxide
D.Ammonia
E.All the refrigerants have identical specific volume
If the compressor of a refrigeration system is noisy, it shows that
A.Compressor drive coupling is loose
B.Lack of oil
C.Internal parts of compressor broken
D.Compressor or motor loose on base
E.Any of the above
