Process Equipment and Plant Design
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

Is always less than arithmetic mean value, but more than geometric mean value
Is always more than arithmetic mean value and the geometric mean value
Is always less than arithmetic average value
May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current

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

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

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