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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

Equal to
Greater than
None of the listed here
Less than

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Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Gives noisy operation
Gives quiet operation
Requires little power consumption
Cools below 0°C

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

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Refrigeration and Air Conditioning
During cooling and dehumidification, dry bulb temperature

Increases
None of these
Decreases
Remains constant

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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

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

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

Of evaporator
Of cooling medium
Of freezing zone
At which refrigerant gas becomes liquid

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