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Heat Transfer

Heat Transfer
Maximum heat transfer rate is achieved in __________ flow.

Counter-current
Laminar
Co-current
Turbulent

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Heat Transfer
A 2-4 heat exchanger involves

Both counter and parallel-flow of the fluids
Only parallel-flow of fluids
Only counter-flow of fluids
Smaller pressure drop compared to 1-2 exchanger

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Heat Transfer
The most conducive surface for dropwise condensation to occur is the __________ surface.

Oily
Glazed & polished
Smooth
Coated

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Heat Transfer
Dropwise condensation of steam on cooling surface is promoted

When both the steam and the tube are clean
Only in presence of air
An oily surface
None of these

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Heat Transfer
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?

Yellow paint
White paint
Grey paint
Black paint

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Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

none of the listed here
there exists an unsteady state
heat transfer co-efficient over the entire heat exchanger is not constant
the heat capacity is not constant and there is a phase change.

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