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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following is not a desirable property of a refrigerant?

Low boiling point
High risibility with oil
Good electrical conductor
Large latent heat

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Refrigeration and Air Conditioning
The dehumidification process, on the psychrometric chart, is shown by

Vertical line
Horizontal line
Inclined line
Curved line

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Refrigeration and Air Conditioning
Freon group of refrigerants are

Toxic
Inflammable
Nontoxic and non-inflammable
Non-inflammable and toxic

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
Carbon dioxide
Ammonia
R-12

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

1 kW
2 kW
3 kW
4 kW

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

Increases
None of these
Remains constant
Decreases

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