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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

56 bars
Atmospheric pressure
24 bars
Slightly above atmospheric pressure

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

Freon-22
Freon-12
NH3
CO2

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Refrigeration and Air Conditioning
The material of pipe lines for a system using Freon as a refrigerant should be

Steel
Copper
Brass
Aluminium

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

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

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Refrigeration and Air Conditioning
Accumulators should have adequate volume to store refrigerant charge at least

0.5
0.25
0.75
0.1

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Rubber
Lead
Iron
Aluminium

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