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Heat Transfer

Heat Transfer
Maximum heat transfer rate is obtained in __________ flow.

Turbulent
Laminar
Transition region
Creeping

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Heat Transfer
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

P and Q
R and S
P and R
P and S

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

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Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Open pan
Long tube
Agitated film
None of these

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Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

26
18
1
7

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Heat Transfer
What is the steam economy in case of a single effect evaporator system?

< 1
>1
1
0.1

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