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Heat Transfer

Heat Transfer
Correction is applied to LMTD for __________ flow.

Parallel
None of these
Counter
Cross

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Heat Transfer
Peclet number (Pe) is given by

Pe = Nu.Re
Pe = Re/Pr
Pe = Re.Pr
Pe = Pr/Re

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Heat Transfer
The thermal boundary layer at NPr > 1

And the hydrodynamic boundary layer are identical
Disappears
Is thinner than hydrodynamic boundary layer
Is thicker than hydrodynamic boundary layer

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Heat Transfer
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

0.85
0.45
0.55
0.35

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Heat Transfer
In a single effect evaporator, the economy is

1
None of these
< 1
> 1

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Heat Transfer
_______ paint has the maximum absorption coefficient.

Grey
Yellow
Black
White

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