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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For unsaturated air, the dew point temperature is __________ wet bulb temperature.

Less than
Equal to
None of these
More than

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

cooling below 0°C
noisy operation
quiet operation
very little power consumption

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Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

NH3
Freon-22
CO2
Freon-12

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Refrigeration and Air Conditioning
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Sum of (A) and (B)
Heat stored in the human body
Difference of (A) and (B)
Heat dissipated to the surroundings

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m/hK
m/h
m²/h
m²/hK

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Non-frosting evaporator
Frosting evaporator
Defrosting evaporator
None of these

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