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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Cools below 0°C
Gives noisy operation
Requires little power consumption
Gives quiet operation

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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

0.67
0.6
0.4
0.376

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

Water will evaporate
A gas will immediately liquefy
A gas will never liquefy
Water will never evaporate

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

Ammonia
R-11
R-22
R-12

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Refrigeration and Air Conditioning
Pressure of water vapour is given by

μ/[1 - (1 - μ) (Ps/Pb)]
0.622 Pv/ (Pb - Pv)
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Normal cooling
None of the listed here
Super-cooling
Sub-cooling or under-cooling

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