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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

Remains constant
Decreases
None of these
Increases

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Refrigeration and Air Conditioning
The lowest temperature during the cycle in a vapour compression system occurs after

Compression
Condensation
Evaporation
Expansion

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 60% RH
26°C DBT and 50% RH
26°C DBT and 60% RH
20°C DBT and 50% RH

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Refrigeration and Air Conditioning
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

Absorber, generator and liquid pump
Generator
Absorber and generator
Liquid pump

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
R-12
Ammonia
Carbon dioxide

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

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MORE MCQ ON Refrigeration and Air Conditioning

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