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Heat Transfer

Heat Transfer
Peclet number (Pe) is given by

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

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Heat Transfer
In a forward feed multiple effect evaporator unit

Viscosity of liquid is highest in first effect
No pump is required to withdraw the product from the last effect
Transfer from effect to effect is done by pumps
None of these

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Heat Transfer
A __________ evaporator employs an annular downtake.

Long tube vertical
Horizontal
None of these
Basket type

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

Black paint
White paint
Grey paint
Yellow paint

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Heat Transfer
The equivalent diameter for pressure drop is __________ that for heat transfer

greater than
equal to
smaller than
None of the listed here

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Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

More
Less
Either more or less ; depends on the nature of vapor
Some

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