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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

Sulphur dioxide
R-12
Ammonia
Carbon dioxide

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

None of these
Temperature of the evaporator
Degree of superheat at exit from the evaporator
Pressure in the evaporator

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Refrigeration and Air Conditioning
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

All of these
Water temperature being high
Lack of cooling water
Dirty condenser surface

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Expansion valve to the evaporator
Condenser to the evaporator
Condenser to the expansion valve
Evaporator to the thermostat

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Refrigeration and Air Conditioning
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

1/ B.P.F.
1 - B. P.F.
P.F. - 1
1 + B.P.F.

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Carbon dioxide
Brine
Ammonia
Freon

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