Chemical Engineering · all questions

Heat Transfer
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Q21

Crystal size in a continuous crystalliser depends upon the

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Q22

For heat flow through very thick walled cylinder, use____mean radius.

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Q23

In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell)

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Q24

Tube pitch is the __________ of tube diameters and the clearances.

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Q25

The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where,

Δ T

= Temperature drop across condensate film)

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Q26

Multiple effect evaporators ar used to

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Q27

Pick out the wrong statement.

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Q28

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because

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Q29

For a laminar flow of fluid in a circular tube, 'h₁' is the convective heat transfer co-efficient at velocity 'V₁'. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is

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Q30

If h₁ = inner film co-efficient and /h₂ = outer film co-efficient, then the overall heat transfer co-efficient is

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Q31

The unit of heat transfer co-efficient is

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Q32

If average heat transfer co-efficient is

h_{a}

and the local coefficient at the end of the plate is

h_{l}

then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

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Q33

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

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Q34

When vaporisation takes place directly at the heating surface, it is called

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Q35

Which is the most suitable for the con-certration of highly concentrated solution?

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Q36

View factor is important in heat transfer by

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Q37

Thermal diffusivity is the most important in heat transfer by

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Q38

Tube expansion allowances exist in __________ heat exchanger.

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Q39

In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)

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Q40

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is

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