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Heat Transfer

Heat Transfer
Steam economy in case of a triple effect evaporator will be

Between 0 and 1
1
> 1
< 1

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Heat Transfer
The number of kg vaporised per kg of steam fed to the evaporator is defined as

Rate of evaporation
Rate of vaporisation
Economy
Capacity

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Heat Transfer
The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter (D) as

(D)-1.8
(D)1.8
(D)-0.2
(D)0.2

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Heat Transfer
Economy of a multiple effect evaporator is not influenced much by the

temperature of the feed
boiling point elevations
ratio of the weight of the thin liquor to thick liquor
rate of heat transfer

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Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Super
Sensible
Both B & C
Latent

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = 2k/h
r = h/k
r = k/2h
r = k/h

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MORE MCQ ON Heat Transfer

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