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Heat Transfer

Heat Transfer
Peclet number (Pe) is given by

Pe = Nu.Re
Pe = Re/Pr
Pe = Re.Pr
Pe = Pr/Re

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Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Is easy to operate and maintain
All of these
Is more economical
Occupies smaller space

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Heat Transfer
In natural convection heat transfer, the correlating parameter is the

Bond number
Eckert number
Graetz number
Grashoff number

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Heat Transfer
Which area is used in case of heat flow by conduction through a cylinder ?

None of the listed here
Arithmetic mean area
Geometric mean area
Logarithmic mean area

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Heat Transfer
In a cooling tower, water becomes cool by

Loosing latent heat
Loosing sensible heat
Vaporisation due to heat loss to air
Heat transfer to surroundings

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Heat Transfer
According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

f/4
f
f/2
2f

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