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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

5°C
20°C
15°C
10°C

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

Two heat exchangers
Four heat exchangers
Three heat exchangers
One heat exchanger

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes vapour
Above which liquid will remain liquid
Above which liquid becomes gas
Above which liquid becomes solid

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Joule cycle
Reversed Carnot cycle
Reversed Brayton cycle
Reversed Otto cycle

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Refrigeration and Air Conditioning
The process, generally used in summer air conditioning to cool and dehumidify the air, is called

Heating and humidification
Humidification
Dehumidification
Cooling and dehumidification

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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
Newton's law of gases
Kinetic theory of gases
Avogadro's hypothesis

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