W/m.k
W/m
W/m.k²
None, A is just a number
✅ The correct answer is option C.
Heat Transfer MCQs
362. With the increase of temperature, the Col-burn jH factor
Increases
Decreases
Remains unchanged
May increase or decrease ; depending on temperature
✅ The correct answer is option A.
363. Which of the following is directly concerned with the heat transfer?
Strouhal number
Sherwood number
Euler number
Grashoff number
✅ The correct answer is option D.
364. Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
Basket type
Horizontal tube
Calendria
None of these
✅ The correct answer is option A.
365. Heat transfer occurs by natural convection because change in temperature causes difference in
Viscosity
Density
Thermal conductivity
Heat capacity
✅ The correct answer is option B.
366. Water is normally used as a coolant in the heat exchange equipments mainly because ofits
Abundance & high heat capacity
Low density
Low viscosity
High fluidity
✅ The correct answer is option A.
367. According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
2f
f
f/2
f/4
✅ The correct answer is option C.
368. Pick out the correct equation.
JH = (St)(Pr)2/3 = f/2
JH = (St)(Pr)1/3 = f/2
JH = (St)2/3(Pr) = f/2
JH = (St)1/3(Pr) = f/2
✅ The correct answer is option A.
369. __________ equation relates the thermal conductivity of a solid to its temperature.
Antonie
Kopp’s
Lee’s
Kistyakowski
✅ The correct answer is option C.
370. Fourier’s law applies to the heat transfer by
Convection
Radiation
Conduction
All of the above
✅ The correct answer is option C.