Which of the following refrigerant is the cheapest?
A.Ammonia
B.Freon 12
C.Freon 22
D.Methyl chloride
E.Air
Category: Refrigeration and Air conditioning Mcqs
The colour of the flame of halide torch in case of leakage of freon refrigerant, will change to
A.Yellow
B.Red
C.Green
D.Orange
E.Violet
In case the relative humidity of atmospheric air is 100% the rate of evaporation of water will be
A.Half the water already air
B.Half the water already air
C.Very high
D.Slow
E.Zero
A Carnot refrigerator operates between 300.3 K and 273 K. The fraction of cooling effect required as work input is
A.20%
B.10%
C.50%
D.Not possible to find with the data
Which of the following valves is used on domestic refrigerators
A.Solenoid valve
B.Expansion valve
C.Spring safety valve
D.Wheel valve
E.None of the above
The type of compressor used in refrigeration system is
A.Reciprocating
B.Centrifugal
C.Rotary sliding vane
D.Rotary screw compressor
E.All of the above
The condition of refrigerant before and after compression in vapour compression cycle is
A.Wet vapour, cry saturated vapour
B.Liquid, wet vapour
C.Dry saturated vapour, superheated vapour
D.Dry saturated vapour, liquid
E.Wet vapour, wet vapour
The freezing point of ammonia is
A.0?C
B.? 20?C
C.? 77.8?C
D.? 132.5?C
E.? 202.5?C
Moisture in Freon refrigeration system causes
A.Ineffective refrigeration
B.Damage to compressor
C.High power consumption
D.Freezing of automatic regulating valve
E.None of the above
