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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Specific humidity
Dew point temperature
Dry bulb temperature
Wet bulb temperature

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Refrigeration and Air Conditioning
Vertical lines on pressure-enthalpy chart show constant

Temperature lines
Total heat lines
Entropy lines
Pressure lines

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Rubber
Aluminium
Iron
Lead

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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 humidified
Heated and dehumidified
Heated and humidified
Cooled and dehumidified

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Saturated liquid
Liquid
Sub-cooled liquid
Wet vapour

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Refrigeration and Air Conditioning
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

Humidity ratio
Degree of saturation
Absolute humidity
Relative humidity

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