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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 50% RH
26°C DBT and 60% RH
26°C DBT and 50% RH
20°C DBT and 60% RH

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

increases
decreases
depends on other factors
remains same

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

Sulphur dioxide
R-12
Ammonia
Carbon dioxide

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

Sulphur dioxide
R-12
Ammonia
Carbon dioxide

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

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

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

None of the listed here
Lower than
Same as
Higher than

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