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Heat Transfer

Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

High
Low
Extremely low
No

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Heat Transfer
Air is best heated with steam in a heat exchanger of

double pipe type with fin on air side
double pipe type with fin on steam side
shell and tube type
plate type

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Heat Transfer
All analogy equations connecting friction factor and heat transfer co-efficient apply only to

Wall or skin friction
Both A and B
Turbulent flow
Form friction

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Heat Transfer
The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter (D) as

(D)0.2
(D)-0.2
(D)1.8
(D)-1.8

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Heat Transfer
Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

There is no internal heat generation
Boundary surfaces are isothermal
Constant temperature gradient exists
Material is anisotropic

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Heat Transfer
__________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.

None of these
Single pass, fixed tube sheet
U-tube
Three pass, fixed tube sheet

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