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Refrigeration and Air Conditioning

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

None of these
Decreases
Increases
Remains constant

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will be higher
Will be lower
Will remain unaffected
May be higher or lower depending upon the nature of non-condensable gases

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

22°C
14°C
5°C
8°C

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Refrigeration and Air Conditioning
The capillary tube, as an expansion device, is used in

All of these
Water coolers
Domestic refrigerators
Room air conditioners

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Refrigeration and Air Conditioning
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

Any value
High, of the order of 25°
Zero
As low as possible (3 to 11°C)

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Operating the machine at higher speeds
Lowering the higher temperature
Operating the machine at lower speeds
Raising the higher temperature

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