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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

2.33
3.33
1.33
4.33

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Refrigeration and Air Conditioning
For unsaturated air, the dew point temperature is __________ wet bulb temperature.

Equal to
Less than
None of these
More than

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

Heated and humidified
Cooled and dehumidified
Cooled and humidified
Heated and dehumidified

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Refrigeration and Air Conditioning
Ammonia is

Highly toxic and inflammable
Toxic and non-inflammable
Non-inflammable
Non-toxic

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Mixture of ice and water under equilibrium conditions
Water at 0°C
Ice at 4°C
Solid and dry ice

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Takes place at constant temperature
Involves no change in volume
Takes place at constant pressure
Takes place at constant entropy

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