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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

100
20
50
Zero

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

100 kJ/kg
125 kJ/kg
50 kJ/kg
25 kJ/kg

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Refrigeration and Air Conditioning
The air cooling system mostly used in transport type aircrafts is

Simple evaporative air cooling system
Bootstrap air cooling system
Simple air cooling system
All of the listed here

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Refrigeration and Air Conditioning
The humidification process, on the psychrometric chart is shown by

Inclined line
Curved line
Horizontal line
Vertical line

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Refrigeration and Air Conditioning
One of the purposes of sub cooling the liquid refrigerant is to

Reduce compressor overheating
Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Reduce compressor discharge temperature
Increase cooling effect

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Refrigeration and Air Conditioning
In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

Evaporator
Condenser
Expansion valve
Compressor

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