Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

Fixing the tubes
Increasing pressure drop
Creating turbulence
Reducing scale deposition

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Heat of mixing of normal liquid is assumed to be zero
Sensible heat changes for vapour & liquid are negligibly small
Molar latent heat of the two components are equal
Reflux is not a saturated liquid

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