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

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

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Process Equipment and Plant Design
In a bag filter, the pressure drop increases directly as the

Viscosity of the gas and inversely as density of the gas
None of these
Density of the gas and inversely as viscosity of the gas
Density of the gas, but is independent of the viscosity of the gas

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