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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During sensible cooling of air, specific humidity

None of the listed here
Remains constant
Decreases
Increases

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

14°C
5°C
8°C
22°C

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Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

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

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Refrigeration and Air Conditioning
The dry bulb temperature lines, on the psychrometric chart are

Horizontal and uniformly spaced
Curved lines
Vertical and uniformly spaced
Horizontal and non-uniformly spaced

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Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

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

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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

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

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MORE MCQ ON Refrigeration and Air Conditioning

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