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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Freon-11
CO2
Freon-22
Air

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

R-12
Sulphur dioxide
Ammonia
Carbon dioxide

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Refrigeration and Air Conditioning
As relative humidity decreases, the dew point temperature will be ___ wet bulb temperature.

Lower than
Same as
Higher than
None of the listed here

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

A gas will immediately liquefy
Water will never evaporate
Water will evaporate
A gas will never liquefy

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

25°C DBT and 100% RH
25°C DBT and 40% RH
22°C DBT and 60% RH
20°C DBT and 80% RH

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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

Low
Very low
Same
High

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MORE MCQ ON Refrigeration and Air Conditioning

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