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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Non-flammable
Odourless
All of the listed here
Colourless

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Refrigeration and Air Conditioning
The mass of water vapour present in __________ is called absolute humidity.

1 kg of dry air
1 m3 of water
1 m3 of dry air
1 kg of wet air

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

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Refrigeration and Air Conditioning
A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called

Dry air
Moist air
Specific humidity
Saturated air

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Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Evaporator
Condenser
Absorber
Condenser, absorber and separator (rectifier)

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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

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

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