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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

Absorber
Condenser
Evaporator
None of these

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes solid
Above which liquid becomes gas
Above which liquid will remain liquid
Above which liquid becomes vapour

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

T₁ / (T₂ - T₁)
T₂/ (T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

8 bar
30 bar
2 bar
15 bar

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

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

Two heat exchangers
One heat exchanger
Three heat exchangers
Four heat exchangers

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