Which of the following refrigerant has the freezing point?
A.Ammonia
B.Carbondioxide
C.Freon 11
D.Freon 22
Category: Refrigeration and Air conditioning Mcqs
Which of the following is not a dehydrator?
A.Silica sel
B.Molecular sieve
C.Calcium chloride
D.Sodium chloride
E.All of the above
In a mechanical refrigeration system the refrigerant occurs as liquid (or very wet vapour) between
A.Compressor outlet and condenser
B.Condenser and expansion valve
C.Expansion valve or evaporator
D.Evaporation valve and compressor
E.Before and after compressor
In case of freon as refrigerant the pipe lines should be of
A.Copper
B.Brass
C.Seamless steel tubes
D.Stainless steel tubes
E.None of the above
Air for air conditioning of aircraft cabin is obtained by
A.Compressing ambient air
B.Recycling cabin air
C.Dehumidifying cabin air
D.Bleeding from air compressor
E.Turbine exhaust
PVC tubes are used for condenser and evaporator when the refrigerant is
A.Freon 12
B.Freon 22
C.Ammonia
D.Sulphur dioxide
E.None of the above
When the air temperature reaches the point where relative humidity is 100% the air is saturated because it cannot hold any more moisture. This temperature is called
A.Freezing point
B.Partial freezing point
C.Dew point
D.Dew point of water vapour
E.Dew point of air
Refrigerant 744 is
A.Air
B.Ammonia
C.Carbondioxide
D.Freon 12
E.Freon 22
