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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The central air conditioning system has ___________ overall efficiency as compared to individual systems.

Higher
None of these
Lower
Same

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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
25°C DBT and 40% RH
22°C DBT and 60% RH

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Dry bulb temperature
Specific humidity
Wet bulb temperature
Relative humidity

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Ammonia
Sulphur dioxide
Carbon dioxide
R-12

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Refrigeration and Air Conditioning
Chaperon equation is a relation between

Specific volume and enthalpy
Temperature and enthalpy
Temperature, pressure, specific volume and enthalpy
Temperature, pressure and enthalpy

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

None of these
Dew point temperature
Wet bulb temperature
Dry bulb temperature

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