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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Slightly above atmospheric pressure
56 bars
Atmospheric pressure
24 bars

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Refrigeration and Air Conditioning
Freon group of refrigerants are

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

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Increases heat transfer rate
Can be avoided by proper design
Results in loss of heat due to poor heat transfer
Is immaterial

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

Remains constant
None of these
Decreases
Increases

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Refrigeration and Air Conditioning
The relative humidity lines on a psychrometric chart are

Horizontal and non-uniformly spaced
Curved lines
Vertical and uniformly spaced
Horizontal and uniformly spaced

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Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

P.F. - 1
1 - B.P.F.
1 + B.P.F.
1/ B.P.F.

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