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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
All of the listed here
Non-flammable
Odourless

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called

Dry bulb temperature
Wet bulb temperature
Dew point temperature
None of these

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Refrigeration and Air Conditioning
The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is

0.6
0.4
0.67
0.376

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

(Actual C.O.P.) × (Theoretical C.O.P.)
(Actual C.O.P.) /(Theoretical C.O.P.)
(Theoretical C.O.P.)/ (Actual C.O.P.)
None of these

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

Equal to critical temperature
Reduced to a value below its critical temperature
None of these
Increased to a value above its critical temperature

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

Two heat exchangers
Three heat exchangers
Four heat exchangers
One heat exchanger

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