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HEAT TRANSFER

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

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

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

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

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Heat Transfer
The Graetz number is concerned with the

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

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

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

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Heat Transfer
In forced convection, the heat transfer depends on

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

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