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Heat Transfer

Heat Transfer
Economy of an evaporator is influenced by the

Both B & C
Feed temperature
Steam pressure
Number of effect

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Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α ≠ 1, ε ≠ 1
α ≠ 1, ε = 1
α = 1; ε ≠ 1
α = 1; ε = 1

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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

0.45
0.85
0.35
0.55

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Heat Transfer
The thermal boundary layer at NPr > 1

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

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Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Passes through a maxima
Decreases
Increases
Remains constant

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Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

1
> 1
Between 1 & 2
< 1

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MORE MCQ ON Heat Transfer

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