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
The tube bundle is suspended on bracket
It is used for high viscosity liquor having large rate of scaling

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Process Equipment and Plant Design
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

More than that for fluid flow
Less than that for fluid flow
Same as that for fluid flow
D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)

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Process Equipment and Plant Design
Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.

3 times the thickness
6% of I.D.
Either A or B, whichever is larger
Either A or B, whichever is smaller

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