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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

O.P remains unaltered
Increases C.O.P
Decreases C.O.P
Other factors decide C.O.P

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Refrigeration and Air Conditioning
In which of the following refrigeration system, waste heat can be effectively used?

Air refrigeration cycle
Vapour absorption cycle
None of the listed here
Vapour compression cycle

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and dew point temperature, is called

Degree of saturation
Wet bulb depression
Dry bulb depression
Dew point depression

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

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

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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
0.67
0.376
0.4

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Aluminium
Steel
Brass
Copper

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