Discussion
An auxiliary drive is provided on a cement kiln so that
Answer: D
Correct answer: the kiln can be turned slowly during a power failure
A kiln left stationary while hot sags under its own weight and the refractory is destroyed, so it must keep turning even with the supply lost. The auxiliary drive is small, usually fed from a diesel set or a battery, and turns the kiln at a fraction of a revolution a minute until it has cooled.
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