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Heat Transfer

Heat Transfer
Planck's distribution law is valid for __________ bodies

black
all of the listed here
white
coloured

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Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

All of these
Oscillations in the flow of shell/tube sides fluid
Vibrations transmitted through piping and/or supports due to external reasons
Flow of fluid on the tube and shell sides

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

0.0035
0.025
3.5
5.6

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Same
Different
Never different
Linearly related

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Heat Transfer
Maximum heat transfer rate is achieved in __________ flow.

Co-current
Turbulent
Counter-current
Laminar

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Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

Decreases
May increase or decrease; depends on the solid
Increases
Remains unchanged

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