Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Less than arithmetic mean value
Both B & C
More than geometric mean value
More than arithmetic mean value

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

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

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