in evaporator
before expansion valve
between compressor and condenser
between condenser and
✅ The correct answer is option C.
Heat Transfer
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.
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.
The boiling point of R-12 is about – 30°C.
TRUE
FALSE
✅ The correct answer is option A.
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.
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.
The rato of energy transferred by convection to that by conduction is called
Stanton number
Nusselt number
Biot number
Peclet number
✅ The correct answer is option B.
During humidification process, __________ increases.
wet bulb temperature
relative humidity
dry bulb temperature
specific humidity
✅ The correct answer is option B.
For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.
Correct
Incorrect
✅ The correct answer is option A.
A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.
same
lower
higher
✅ The correct answer is option B.