Process Equipment and Plant Design
Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the

Ultimate stress to breaking stress
Working stress to ultimate stress
Ultimate stress to working stress
None of these

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Process Equipment and Plant Design
Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.

Higher pressure fluid stream should be routed through the shell side
Lower flow rate fluid should be routed through the shell side
The viscous fluid should be routed through the shell side
The corrosive and fouling fluid should be preferably routed through the tubes

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Both A & B
Economic limit reached, when the plant cost exceeds the saving of steam
Neither A nor B
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference

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