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

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

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Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant
Both B & C
Both will absorb equal amount of radiation from the surrounding in the beginning
Both the spheres will emit equal amount of radiation per unit time in the beginning

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