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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Non-flammable
Colourless
Odourless
All of the listed here

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Refrigeration and Air Conditioning
For unsaturated air, the dew point temperature is __________ wet bulb temperature.

Less than
None of these
Equal to
More than

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Commercial refrigerators
Domestic refrigerators
Air conditioning
Gas liquefaction

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Using reagents
Smelling
Sulphur sticks which on detection gives white smoke
Halide torch which on detection produces greenish flame lighting

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

Ammonia
Sulphur dioxide
Carbon dioxide
Fluorine

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Refrigeration and Air Conditioning
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

As low as possible (3 to 11°C)
Zero
High, of the order of 25°
Any value

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