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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

20 to 50°C
70 to 110°C
50 to 70°C
None of these

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Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

(hA - h2)/ (h1 - h2)
(hA - h1)/ (h2 - h1)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)

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

Indirect
Compression
Absorption
Direct

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

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

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

Absorber
Evaporator
Condenser, absorber and separator (rectifier)
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)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₁ / (T₂ - T₁)

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