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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?

Carbon dioxide
Sulphur dioxide
Fluorine
Ammonia

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Refrigeration and Air Conditioning
The capacity of a domestic refrigerator is in the range of

3 to 5 TR
0.1 to 0.3 TR
5 to 7 TR
1 to 3 TR

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
Carbon dioxide
R-12
Ammonia

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-30°C
-33.3°C
-77.7°C
-10.5°C

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Carbon dioxide
Brine
Freon
Ammonia

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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,

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

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