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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Expansion valve
Compressor
Condenser
Evaporator

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Frosting evaporator
None of these
Non-frosting evaporator
Defrosting evaporator

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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
The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

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

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Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

1.25
0.8
0.25
0.5

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Lead
Aluminium
Iron
Rubber

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