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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The C.O.P. of a heat pump working on a reversed Carnot cycle is

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

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

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

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Refrigeration and Air Conditioning
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Heat dissipated to the surroundings
Sum of (A) and (B)
Heat stored in the human body
Difference of (A) and (B)

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Refrigeration and Air Conditioning
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

Detect liquid in vapour
Superheat the vapour
Collect vapours
Collect liquid refrigerant and prevent it from going to compressor

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

50 kJ/kg
125 kJ/kg
25 kJ/kg
100 kJ/kg

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Refrigeration and Air Conditioning
The specific humidity during dehumidification process

Increases
None of these
Decreases
Remains constant

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