29) Thermal conductivity of water __________ with rise in temperature.

Answer is:

may increase or decrease depending upon temperature

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30) During adiabatic saturation process on unsaturated air __________ remains constant.

Answer is:

wet bulb temperature

31) The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Answer is:

equal to one

32) A perfect black body is one which

Answer is:

absorbs heat radiations of all wave lengths falling on it

33) Degree of saturation or percentage humidity is

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

Answer is:

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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