Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)3/2
(1.2)2/3
(1.2)5/3
(1.2)3/5

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

There is no central downtake
Downtake is formed by the annular space between the bundle and the shell
It is used for high viscosity liquor having large rate of scaling
The tube bundle is suspended on bracket

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