non-toxic
non-flammable
non-explosive
high boiling point
✅ The correct answer is option D.
Heat Transfer
The unit of overall coefficient of heat transfer is
W/m2K
W/m2
W/mK
W/m
✅ The correct answer is option A.
The __________ point of ammonia is -77.7°C.
freezing
boiling
✅ The correct answer is option A.
The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called
coefficient of performance of refrigeration
coefficient of performance of heat pump
relative coefficient of performance
refrigerating efficien
✅ The correct answer is option A.
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to
-0.33333333333333
-0.66666666666667
1
-1
✅ The correct answer is option A.
An evaporator is also known as
freezing coil
cooling coil
chilling coil
all of these
✅ The correct answer is option D.
In case of liquids and gases, the heat transfer takes place according to
conduction
convection
radiation
none of these
✅ The correct answer is option B.
The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
mean radiant temperature
effective temperature
dew point temperature
none of these
✅ The correct answer is option B.
The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.
low
high
✅ The correct answer is option B.
The conditioned air supplied to the room must have the capacity to take up
room sensible heat load only
room latent heat load only
both room sensible heat and latent heat loads
none of the above
✅ The correct answer is option C.