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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

O.P remains unaltered
Other factors decide C.O.P
Decreases C.O.P
Increases C.O.P

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Refrigeration and Air Conditioning
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

Equally
Less
More
Unpredictable

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Constant pressure cooling process
Isentropic expansion process
Isentropic compression process
Constant pressure expansion process

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Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Increases
None of these
Decreases
Remains constant

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Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Greater than
Equal to
None of these
Less than

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

Lowers compressor capacity because vapour is lighter
All of these
Lowers evaporation temperature
Increases power required per ton of refrigeration

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