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
Category: Refrigeration and Air conditioning Mcqs
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
Which of the following refrigerant is the cheapest?
A.Ammonia
B.Freon 12
C.Freon 22
D.Methyl chloride
E.Air
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
