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Heat Transfer

Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

43834
4
2
43832

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Heat Transfer
Increasing the liquor level in the evaporator results in the

increase in liquor film co-efficient
increased true temperature drop
decreased effect of hydrostatic head
decreased capacity

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

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

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

K/Ax
KA/x
A/Kx
X/KA

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Heat Transfer
Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.

Viscous
Inertial
Elastic
None of these

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

f/4
f/2
2f
f

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