What is the function of powdered coke  and control lamp ?

Dear Student

In process of extraction of Aluminium the molten electrolyte is covered with layer of powder coke to prevent oxidation and loss of heat due to radiation.
 A control lamp is kept in the circuit for electrolysis of alumina to know the concentration of electrolyte. If the electrolyte is strong then bulb will continue to glow brightly. As the concentration of electrolyte decreases the intensity of bulb decreases as well.

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