Freon 12 is a compound consisting of stoms of
A.Carbon, hydrogen and fluorine
B.Carbon, hydrogen and oxygen
C.Carbon, hydrogen, fluorine and chlorine
D.Carbon, fluorine and chlorine
E.Carbon and hydrogen
Category: Refrigeration and Air conditioning Mcqs
In a vapour compression cycle the refrigerant immediately after expansion valve is in
A.Liquid form
B.Wet vapour form
C.Dry vapour form
D.Dry and saturated vapour form
E.None of the above
Brine is always used as a secondary refrigerant in
A.Cold storage plant
B.Milk chilling plant
C.Cinema hall air conditioning plants
D.Ice plant
E.All of the above
The effect of under cooling the refrigerant is to
A.Reducing the COP of the cycle
B.Increase the COP of the cycle
C.Reduce the refrigerating effect
D.Increase the super heat of vapour
E.None of the above
Sometimes refrigeration plants use cooling towers. The water cooled in those towers is supplied
A.For defrosting evaporator coils
B.To cool compressor cylinder only
C.To cool refrigerant in evaporator
D.To cool refrigerant in condenser
E.None of the above
The ratio of water vapour to the mass of dry air in a given mixture is known as
A.Humidity ratio
B.Relative humidity
C.Degree of saturation
D.Any of the above
E.None of the above
A low wet bulb temperature indicates
A.Very cool air
B.Very low humidity
C.Very low atmospheric temperature
D.(A) and (B) above
E.(A) and (C) above
In a domestic refrigerator if the compressor runs continuously, it shows that
A.The system is working perfectly all right
B.The refrigeration is to full capacity
C.The system is overloaded
D.Any of the above
E.None of the above
Water is used as a refrigerant in
A.Vapour absorption cycle
B.Steam jet refrigeration
C.Vapour absorption cycle
D.Cascade system
E.None of the above
In central air conditioning system
A.Entire equipment is placed in the air conditioned space
B.There is only one machine which performs the function of air conditioning
C.All the major equipment is located in one central space removed from the air to be conditioned
D.Is used when small area is to be air conditioned
E.None of the above
