Chemical Engineering Basics
The basic function of the drum in a boiler is to

Act as a storage for feed water
Separate steam from water
Act as a storage for steam
Remove settling impurities from steam

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Chemical Engineering Basics
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

Decreasing the surface area of the electrodes
Increasing the concentration of zinc sulphate solution
Increasing the concentration of copper sulphate solution
Increasing the surface area of the electrodes

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