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

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Refrigeration and Air Conditioning
During sensible cooling of air, specific humidity

Increases
Decreases
Remains constant
None of the listed here

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

2 bar
8 bar
30 bar
15 bar

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

Heated and dehumidified
Heated and humidified
Cooled and humidified
Cooled and dehumidified

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Isentropic compression process
Constant pressure expansion process
Constant pressure cooling process
Isentropic expansion process

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Refrigeration and Air Conditioning
During sensible heating of air _________ decreases.

Specific humidity
Relative humidity
Dry bulb temperature
Wet bulb temperature

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