131. During humidification process, __________ increases.
wet bulb temperature
relative humidity
dry bulb temperature
specific humidity
✅ The correct answer is option B.
Heat Transfer, Refrigeration and Air Conditioning MCQs
132. For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.
Correct
Incorrect
✅ The correct answer is option A.
133. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
the better insulation must be put inside
the better insulation must be put outside
one could place either insulation on either side
one should take into a
✅ The correct answer is option A.
134. The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to
bright green
yellow
red
orange
✅ The correct answer is option A.
136. The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called
Kinetic theory of gases
Newton’s law of gases
Dalton’s law of partial pressures
Avogadro’s hypothesis
✅ The correct answer is option C.
137. The radiation emitted by a black body is known as
black radiation
full radiation
total radiation
all of these
✅ The correct answer is option D.
138. In mechanical refrigeration system, the refrigerant has the maximum temperature
in evaporator
before expansion valve
between compressor and condenser
between condenser and
✅ The correct answer is option C.
139. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
heat dissipated to the surroundings
heat stored in the human body
sum of (a) and (b)
difference of (a) and
✅ The correct answer is option C.