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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

R-12
Carbon dioxide
Ammonia
Sulphur dioxide

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Refrigeration and Air Conditioning
Pressure of water vapour is given by

0.622 Pv/ (Pb - Pv)
None of these
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]

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Refrigeration and Air Conditioning
The condition of refrigerant as it leaves the compressor in a vapour compression system is

Wet vapour
Dry saturated vapour
Superheated vapour
Saturated liquid

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Condensation of the refrigerant vapour
Metering of the refrigerant liquid
Evaporation of the refrigerant liquid
Compression of the refrigerant vapour

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Refrigeration and Air Conditioning
Rating of a domestic refrigerator is of the order of

5 tons
10 tons
0.1 ton
40 tons

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Refrigeration and Air Conditioning
Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

Strong solution to ammonia vapour
Ammonia vapours to weak solution
Weak solution to strong solution
Strong solution to weak solution

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