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HEAT TRANSFER

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

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

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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

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

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

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

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Heat Transfer
In forced convection, the heat transfer depends on

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

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