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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Salty
Scaling
Highly viscous

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Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

Keeping the heat transfer surface clean
None of these
Enhancing the fluid pumping rate
Increasing the tube length

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Heat Transfer
What is the absorptivity of a black body?

0.95
1
0.78

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Heat Transfer
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

Kirchoffs
Stefan-Boltzman
Wien's displacement
Planck's

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Heat Transfer
Which of the following is not used as a medium for high temperature heating ?

liquid metal
dowtherm
mercury
None of the listed here

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

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

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