Refrigeration and Air Conditioning
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

Effective temperature
Mean radiant temperature
Dew point temperature
None of the listed here

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Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

None of these
Is suitable only for constant load systems
Maintains different temperatures in evaporator in proportion to load
Ensures the evaporator completely filled with refrigerant of the load

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Refrigeration and Air Conditioning
The relative humidity is defined as

The mass of water vapour present in 1 kg 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 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 m3 of dry air

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