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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
Non-flammable
Odourless
All of the listed here

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Refrigeration and Air Conditioning
The vertical and uniformly spaced lines on a psychrometric chart indicates

Specific humidity
Dry bulb temperature
Wet bulb temperature
Dew point temperature

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Refrigeration and Air Conditioning
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

50
Zero
20
100

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Low side float valve
Thermostatic expansion valve
High side float valve
Automatic expansion valve

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

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Refrigeration and Air Conditioning
The desirable property of a refrigerant is

All of these
High latent heat of vaporisation
Low boiling point
High critical temperature

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