Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36.
During adiabatic saturation process on unsaturated air __________ remains constant.
relative humidity
dew point temperature
dry bulb temperature
wet bulb temperature
Answer: Option
Explanation:
No answer description is available. Let's discuss.

37.
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
equal to one
greater than one
less than one
equal to Nusselt number
Answer: Option
Explanation:
No answer description is available. Let's discuss.

38.
A perfect black body is one which
is black in colour
absorbs heat radiations of all wave lengths falling on it
reflects all the heat radiations
transmits the heat radiations
Answer: Option
Explanation:
No answer description is available. Let's discuss.

39.
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: Option
Explanation:
No answer description is available. Let's discuss.

40.
The coefficient of performance of Heat Pump is always __________ one.
equal to
less than
greater than
Answer: Option
Explanation:
No answer description is available. Let's discuss.