Refrigeration and Air Conditioning
The relative humidity is defined as

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
The mass of water vapour present in 1 kg of dry air
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

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Refrigeration and Air Conditioning
Dry bulb temperature is the temperature of air recorded by a thermometer, when

Its bulb is surrounded by a wet cloth exposed to the air
It is not affected by the moisture present in the air
None of the listed here
The moisture present in it begins to condense

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Refrigeration and Air Conditioning
The bypass factor for a cooling coil

Decreases with increase in velocity of air passing through it
May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
Remains unchanged with increase in velocity of air passing through it
Increases with increase in velocity of air passing through it

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