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Heat Transfer

Heat Transfer
Graetz number is given by

kL/mCp
kμ/mCp
mCp/kL
mCp/kμ

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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
All of these
Oscillations in the flow of shell/tube sides fluid

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Heat Transfer
Radiation heat transfer rates does not depend upon the

type of absorbing surface
surface area and temperature of the heat source
none of the listed here
distance between the heat source and the object receiving the heat

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Heat Transfer
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

Catchall
Bleed point
Baffle
Vent

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Heat Transfer
Evaporator tubes are generally

Inclined
Vertical
Random
Horizontal

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Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

goes through a minimum
goes through a maximum.
continues to increase
continues to decrease

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