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Heat Transfer

Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

X/KA
A/Kx
KA/x
K/Ax

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

1000 - 1500 BTU/hr. ft.2°F
50 -100 Kcal/hr.m².°C
50 -100 W/m² . °K
50 -100 BTU/hr. ft.2°F

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Heat Transfer
Film condensation is promoted on a/an __________ surface.

dirty
oily
coated
clean & smooth

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Heat Transfer
Prandtl and Reynold's analogies are identical for Prandtl number value of

5
0.5
1

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Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Flow of fluid on the tube and shell sides
All of these
Oscillations in the flow of shell/tube sides fluid
Vibrations transmitted through piping and/or supports due to external reasons

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

Evaporators operate under vacuum
None of these
Solution has an elevation of boiling point
Evaporators opreate at atmospheric pressure

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