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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Condenser, absorber and separator (rectifier)
Absorber
Evaporator
Condenser

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Remains constant
Decreases
None of these
Increases

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is saturated liquid

After passing through the expansion throttle valve
Before entering the expansion valve
After passing through the condenser
Before passing through the condenser

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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)

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

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Refrigeration and Air Conditioning
Most of the domestic refrigerators work on the following refrigeration system

Carnot cycle
Electrolux refrigerator
Vapour compression
Vapour absorption

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-86.6°C
-135.8°C
-107.7°C
-95.2°C

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MORE MCQ ON Refrigeration and Air Conditioning

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