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HEAT TRANSFER

Heat Transfer
It is not preferable to use superheated steam in evaporators, because of its very

high temperature
high pressure
low film co-efficient
none of the listed here

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Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

0.5-50
0.38-0.78
5-50
100-1000

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Heat Transfer
The Graetz number is concerned with the

absorption with chemical reaction
heat transfer in laminar flow
heat transfer in turbulent flow
mass transfer between a gas and a liquid

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Heat Transfer
Solid angle subtended by the finite surface at the radiating element is

called the view factor.
proportional to the square of the distance between surfaces
called the angle of vision
expressed in terms of radians

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Heat Transfer
In forced convection, the heat transfer depends on

Re, Gr
none of the listed here
Re, Pr
mainly Gr

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