Fluid Mechanics
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is

< Δp
Δp
Δp²
> Δp

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Fluid Mechanics
Turbine impeller

Does not produce tangential current
Is effective over wide range of viscosities
Produces only tangential current
Produces only radial current

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