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Heat Transfer

Heat Transfer
According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

2f
f/2
f
f/4

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Heat Transfer
Which of the following is not used as a medium for high temperature heating ?

mercury
dowtherm
liquid metal
None of the listed here

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Heat Transfer
In the free convection regime of pool boiling, the heat flux is proportional to

Δt1/2
Δt2
Δt
Δt5/4

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Heat Transfer
Economy of an evaporator is influenced by the

Number of effect
Steam pressure
Feed temperature
Both B & C

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Heat Transfer
In forced convection, the heat transfer depends on

Re, Pr
Re, Gr
mainly Gr
none of the listed here

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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

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

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