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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
Odourless
Non-flammable
All of the listed here

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Refrigeration and Air Conditioning
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Heat stored in the human body
Heat dissipated to the surroundings
Difference of (A) and (B)
Sum of (A) and (B)

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

Lower than
None of these
Higher than
Same as

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Refrigeration and Air Conditioning
Wet bulb temperature is the temperature of air recorded by a thermometer, when

The moisture present in it begins to condense
It is not affected by the moisture present in the air
None of these
Its bulb is surrounded by a wet cloth exposed to the air

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Refrigeration and Air Conditioning
The cooling system used for supersonic aircrafts and rockets is

Bootstrap air cooling system
Reduced ambient air cooling system
Regenerative air cooling system
Simple air cooling system

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Operating the machine at lower speeds
Operating the machine at higher speeds
Raising the higher temperature
Lowering the higher temperature

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