REFRIGERATION and AIR CONDITIONING MCQ-2
11.The leakage in a refrigeration system using ammonia is detected by
A. Halide torch
B. Sulphur sticks
C. Soap and water
D. All of these
12.The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents
A. Condensation of the refrigerant vapour
B. Evaporation of the refrigerant liquid
C. Compression of the refrigerant vapour
D. Metering of the refrigerant liquid
13.Which of the following refrigerant is highly toxic and flammable?
A. Ammonia
B. Carbon dioxide
C. Sulphur dioxide
D.R-12
14.The wet bulb depression indicates _________ humidity of the air.
A. Absolute
B. Relative
C. Specific
D. None of these
15.In case of sensible cooling of air, the coil efficiency is given by
A.B.P.F. – 1
B.1 – B.P.F.
C.1/ B.P.F.
D.1 + B.P.F.
16.The specific humidity during dehumidification process
A. Remains constant
B. Increases
C. Decreases
D. None of these
17.The specific humidity during humidification process
A. Remains constant
B. Increases
C. Decreases
D. None of these
18.The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
A. Coefficient of performance of refrigeration
B. Coefficient of performance of heat pump
C. Relative coefficient of performance
D. Refrigerating efficiency
19.The material of pipe lines for a system using Freon as a refrigerant should be
A. Brass
B. Copper
C. Steel
D. Aluminium
20.The vapour pressure of refrigerant should be
A. Lower than atmospheric pressure
B. Higher than atmospheric pressure
C. Equal to atmospheric pressure
D. Could be anything
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