equal to one
greater than one
less than one
equal to Nusselt number
is black in colour
absorbs heat radiations of all wave lengths falling on it
reflects all the heat radiations
transmits the heat radiations
the mass of water vapour present in 1 m3 of dry air
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.
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
equal to
less than
greater than
none of these
compressor
condenser
evaporator
expansion valve