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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Aqua ammonia is used as refrigerant in the following type of refrigeration system

Compression
Absorption
Direct
Indirect

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Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

Does not alter C.O.P.
Decreases C.O.P.
Increases C.O.P.
None of these

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Refrigeration and Air Conditioning
The advantage of dry compression is that

It results in high volumetric and mechanical efficiency
All of these
It permits higher speeds to be used
It permits complete evaporation in the evaporator

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

R-22
R-11
Ammonia
R-12

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Commercial refrigerators
Gas liquefaction
Domestic refrigerators
Air conditioning

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

20°C DBT and 80% RH
25°C DBT and 100% RH
25°C DBT and 40% RH
22°C DBT and 60% RH

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