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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Salty
Scaling
Highly viscous

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Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

None, A is just a number
W/m
W/m.k
W/m.k²

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Heat Transfer
The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

None of these
Stefan-Boltzman's
Wien's displacement
Planck's

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Heat Transfer
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

Δt
Δt³
Δt²
√Δt

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Heat Transfer
The equation, Nst = f/2, is the __________ analogy.

Colburn
Reynolds
Prandtl
None of these

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Heat Transfer
Pick out the correct equation.

JH = (St)2/3(Pr) = f/2
JH = (St)(Pr)1/3 = f/2
JH = (St)(Pr)2/3 = f/2
JH = (St)1/3(Pr) = f/2

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