361. The heat transfer takes place according to
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kirchhoff’s law
✅ The correct answer is option C.
Heat Transfer, Refrigeration and Air Conditioning MCQs
362. Thermal conductivity of water __________ with rise in temperature.
remains same
decreases
increases
may increase or decrease depending upon temperature
✅ The correct answer is option D.
363. The optimum effective temperature for human comfort is
higher in winter than in summer
lower in winter than in summer
same in winter and summer
not dependent on season
✅ The correct answer is option B.
364. The amount of radiation mainly depends upon the
nature of the body
temperature of the body
type of surface of the body
all of these
✅ The correct answer is option D.
367. Defrosting of a refrigerator may be done by stopping the compressor for a short period.
Correct
Incorrect
✅ The correct answer is option A.
369. 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
✅ The correct answer is option A.
370. The heat transfer by conduction through a thick sphere is given by
✅ The correct answer is option B.