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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Sulphur dioxide
R-12
Carbon dioxide
Ammonia

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-11
Ammonia
R-12
R-22

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

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

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using Freon is detected by

Halide torch
All of these
Soap and water
Sulphur sticks

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Refrigeration and Air Conditioning
In a psychrometric chart, specific humidity (moisture content) lines are

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

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Refrigeration and Air Conditioning
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

All of these
Lack of cooling water
Water temperature being high
Dirty condenser surface

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