Forced convection
Steady state conduction
Monochromatic radiation
None of these
✅ The correct answer is option D.
Heat Transfer MCQs
The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.
Colburn
Reynolds
Prandtl
None of these
✅ The correct answer is option A.
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then
hf = hd
hf > hd
hf < hd
hf could be greater or smaller than hd
✅ The correct answer is option C.
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a
Boiler
Heat exchanger
Recuperator
Regenerator
✅ The correct answer is option B.
Thermal conductivity of a gas at low density, __________ with increase in temperature.
Decreases
Increases
Remains unchanged
May increase or decrease; depends on the gas
✅ The correct answer is option B.
The equation, Nst = f/2, is the __________ analogy.
Colburn
Reynolds
Prandtl
None of these
✅ The correct answer is option B.
Tubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping
Both the tube sheets fixed
Both the tube sheets floating
The top tube sheet floating and bottom tube sheet fixed
The top tube sheet fixed and the bottom tube-sheet floating
✅ The correct answer is option A.
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
Grashoff
Reynolds
Both A & B
Prandtl & Grashoff
✅ The correct answer is option D.
What is the absorptivity of a black body?
1
0
0.78
0.95
✅ The correct answer is option A.
Kg of liquid evaporated per hour in an evaporator is defined as its
Capacity
Economy
Steam load
None of these
✅ The correct answer is option A.