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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The dehumidification process, on the psychrometric chart, is shown by

Curved line
Inclined line
Vertical line
Horizontal line

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Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator

Increases heat transfer
Increases power consumption
Improves C.O.P. of the system
Reduces power consumption

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Refrigeration and Air Conditioning
Presence of moisture in a refrigerant affects the working of

Expansion valve
Compressor
Evaporator
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)

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

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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)

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

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Refrigeration and Air Conditioning
The thermostatic expansion valve is used in ________ type of evaporators.

Dry
None of these
DX coil
Flooded

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MORE MCQ ON Refrigeration and Air Conditioning

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