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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Odourless
Colourless
Non-flammable
All of the listed here

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Refrigeration and Air Conditioning
In which of the following refrigeration system, waste heat can be effectively used?

Air refrigeration cycle
Vapour compression cycle
None of the listed here
Vapour absorption cycle

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

5.12
2.15
1.25
1

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Refrigeration and Air Conditioning
During heating and humidification, the final relative humidity of air

None of the listed here
Can be lower or higher than that of the entering air
Is lower than that of the entering air
Is higher than that of the entering air

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

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

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Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

1.2
5
0.2
6

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