Related Questions

The burnout heat flux in the nucleate boiling regime is not a function of the
A Liquid density
B Vapour density
C Temperature difference
D Heat of evaporation
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
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
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
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)
A Δt
B Δt2
C Δt3
D $$\sqrt {\Delta {\text{t}}} $$
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
A Nucleate
B Local
C Pool
D Saturated
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
In a boiling curve, the peak heat flux is called the __________ point.
A Nusselt
B Leidenfrost
C Boiling
D Burnout

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