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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

All of these
R-12
Ammonia
CO?

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Refrigeration and Air Conditioning
In S.J. unit, one ton of refrigeration is equal to

420 kJ/ min
210 kJ/ min
840 kJ/ min
21 kJ/ min

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

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

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

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

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

8 bar
15 bar
30 bar
2 bar

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

20°C DBT and 80% RH
25°C DBT and 100% RH
22°C DBT and 60% RH
25°C DBT and 40% RH

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