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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

4.88
1.49
None of these
1

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Heat Transfer
Natural convection is characterised by

Prandtl number
Peclet number
Grashhoff number
Reynolds number

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

4000
4600
9000
3000

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Heat Transfer
Double pipe heat exchangers are preferably useful, when

High viscosity liquid is to be cooled
A corrosive liquid is to be heated
Requirement of heat transfer area is low
Overall heat transfer co-efficient is very high

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

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Heat Transfer
Reynold's analogy states that

Nst α NRe
Nst α f
NNu α f
NRe α f

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