An increase in the movement of the molecules within a solid, liquid or gas corresponds to
A.A drop in temperature
B.No change in temperature
C.Latent heat addition/removal
D.A rise in temperature
E.None of the above
Category: Refrigeration and Air conditioning Mcqs
During dehumidification process
A.Specific humidity increases
B.Specific humidity decreases
C.Relative humidity increases
D.Relative humidity decreases
E.Relative humidity does not change
Class II group of refrigerants absorb sensible heat while giving refrigeration effect. Which of the following is a class II refrigerant
A.Ammonia
B.Carbondioxide
C.Freon 12
D.Methyl chloride
E.All of the above
A plant has one 300 ton and one 500 ton centrifugal unit. The total flow of brine is 6400 litres per minute. What should be the distribution of brine flow through each unit
A.3200 litres each
B.2400 litres through 300 ton plant and 4000 litres through 500 ton plant
C.4000 litres through 300 ton plant and 2400 litres through 500 ton plant
D.Same brine should flow through both
E.None of the above
One a psychrometric chart cooling and humidification process using spray can be shown by
A.A horizontal line
B.A vertical line
C.A line parallel to dry bulb temperature lines
D.A line parallel to wet bulb temperature lines
E.A curve
Dry ice is
A.solid carbon dioxide
B.ice kept below 0?C to avoid melting
C.solid hydrogen
D.ice kept out of contact of other liquids
In a vapour compression cycle the lowest temperature occurs in
A.Compressor
B.Expansion valve
C.Condenser
D.Receiver
E.Evaporator
The leaks of refrigerant from a cycle may be detected by
A.Halide torch test
B.Sulphur candle test
C.Soap and water test
D.Any of above
E.None of the above
In a vapour compression refrigeration cycle using ammonia as a refrigerant the temperature of ammonia after compression will be at the range
A.? 15?C to – 40?C
B.0?C to – 15?C
C.40?C to 0?C
D.50?C to 40?C
E.70?C to – 110?C
Frost on cooling coils
A.Increases heat transfer
B.Improves COP of the system
C.Reduces power consumption
D.Reduces evaporator temperature
E.Acts as an insulation, increasing power consumption
