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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Non-flammable
Colourless
All of the listed here
Odourless

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 1
9: 1
1: 9
1: 3

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

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

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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)

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

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Refrigeration and Air Conditioning
During dehumidification process, _________ remains constant.

Specific humidity
Dry bulb temperature
Relative humidity
Wet bulb temperature

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Refrigeration and Air Conditioning
During sensible cooling,

Specific humidity increases
Wet bulb temperature increases
Relative humidity remains constant
Partial pressure of vapour remains constant

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