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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Remains constant
None of these
Decreases
Increases

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Refrigeration and Air Conditioning
Vertical lines on pressure-enthalpy chart show constant

Pressure lines
Total heat lines
Temperature lines
Entropy lines

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Refrigeration and Air Conditioning
Which of the following cycles uses air as the refrigerant?

Bell Coleman
Ericson
Carnot
Stirling

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Refrigeration and Air Conditioning
While designing the refrigeration system of an aircraft, the prime consideration is that the

Mass of refrigerant circulated in the system is low
Power per TR is low
Mass of the refrigeration equipment is low
System has high C.O.P.

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

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

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

R-12
Sulphur dioxide
Carbon dioxide
Ammonia

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