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Refrigeration and Air Conditioning

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

Same
Very low
Low
High

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Refrigeration and Air Conditioning
The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

Dalton's law of partial pressures
Avogadro's hypothesis
Newton's law of gases
Kinetic theory of gases

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

NH3
Freon-12
CO2
Freon-22

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Refrigeration and Air Conditioning
In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

Sub-cooled liquid region
Superheated vapour region
Wet vapour region
None of the listed here

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

Halide torch
All of these
Sulphur sticks
Soap and water

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Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Condenser
Expansion valve
Evaporator
Compressor

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