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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

More/less depending on rating
Less
Same
More

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Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

Non-toxic
Non-explosive
Non-flammable
High boiling point

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m/hK
m²/hK
m²/h
m/h

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

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Sub-cooling or under-cooling
Normal cooling
None of the listed here
Super-cooling

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Refrigeration and Air Conditioning
In mechanical refrigeration system, the refrigerant has the maximum temperature

Between compressor and condenser
Before expansion valve
In evaporator
Between condenser and evaporator

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MORE MCQ ON Refrigeration and Air Conditioning

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