Related Questions

The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)
A (ΔT)2
B (ΔT)4
C (ΔT)3
D $$\sqrt {\Delta {\text{T}}} $$
In the free convection regime of pool boiling, the heat flux is proportional to
A $$\Delta {{\text{t}}^{\frac{1}{2}}}$$
B Δt2
C $$\Delta {{\text{t}}^{\frac{5}{4}}}$$
D Δt
Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because
A Convection becomes important
B Conduction becomes important
C Radiation becomes important
D Sub-cooled boiling occurs
Nucleate boiling is promoted
A On polished surfaces
B On rough surfaces
C In the absence of agitation
D None of these
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A Cracking
B Fractional distillation
C Full distillation
D Carbonisation
Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above
Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.
A Boiling point
B Dynamic viscosity
C Kinematic viscosity
D Density
In a boiling curve, the peak heat flux is called the __________ point.
A Nusselt
B Leidenfrost
C Boiling
D Burnout
Boiling of milk in an open vessel is an example of __________ boiling.
A Film
B Sub-cooled
C Saturated nucleate
D None of these

Next steps