Refrigeration and Air Conditioning
The capillary tube is not used in large capacity refrigeration systems because

Capacity control is not possible
It is made of copper
Required pressure drop cannot be achieved
Cost is too high

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Refrigeration and Air Conditioning
In a saturated air-water vapour mixture, the

Dew point temperature is lower than wet bulb temperature
Dry bulb temperature is higher than dew point temperature
Dry bulb temperature is higher than wet bulb temperature
Dry bulb, wet bulb and dew point temperature are same

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Refrigeration and Air Conditioning
The relative humidity is defined as

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
The mass of water vapour present in 1 kg of dry air
The mass of water vapour present in 1 m3 of dry air
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

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Refrigeration and Air Conditioning
Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

0.622 Pv / (Pb - Pv)
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
μ/[1 - (1 - μ) (Ps/Pb)]
None of these

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