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.

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

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Process Equipment and Plant Design
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

To reduce the induced vibration in the tubes
To increase the residence time of shell side fluid
To increase the tube side heat transfer co-efficient by inducing turbulence
To provide support to the tube bundle

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