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Heat Transfer

Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

1
< 1
Between 1 & 2
> 1

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Heat Transfer
For hot feed, forward feeding as compared to backward feeding results in __________ economy.

Increased
None of these
Decreased
No effect on

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Heat Transfer
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

Maximum
Zero
Minimum
Infinity

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Heat Transfer
Economy of a multiple effect evaporator depends upon the

Both A and B
Heat balance consideration
Neither A nor B
Rate of heat transfer

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

20
10
30
1

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Heat Transfer
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

Painting the surface black
Painting the surface white (with aluminium paint)
Roughening the surface
Giving the surface a mirror finish

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