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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Salty
Highly viscous
Corrosive
Scaling

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Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

43.75
35.5
48.25
81.25

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Heat Transfer
Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger?

Fouling characteristic
Corrosiveness
None of these
Viscosity

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Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

May increase or decrease; depends on the solid
Remains unchanged
Decreases
Increases

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

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

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Heat Transfer
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

Tube diameter & pitch
Baffle spacing & shell diameter
Viscosity, density & mass velocity of shell side fluid
None of these

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