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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

Less
More
More or less depending on ambient conditions
Same

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

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

1 kW
3 kW
4 kW
2 kW

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Refrigeration and Air Conditioning
The dry bulb temperature during sensible heating of air

Remains constant
None of these
Decreases
Increases

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Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂
e₁e₂
e₁ + e₂
(e₁ + e₂)/ e₁ + e₂ - e₁e₂

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Could be anything
Higher than atmospheric pressure
Lower than atmospheric pressure
Equal to atmospheric pressure

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MORE MCQ ON Refrigeration and Air Conditioning

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