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A multi-motor drive is used where

  • A.no control of speed is required anywhere in the installation
  • B.several parts of one machine need independent control
  • C.a single machine can be driven adequately by one motor of modest rating
  • D.the machine is small enough to be driven from a line shaft with belting

Answer: B

Rolling mills, paper machines and travelling cranes all have sections whose speeds must be coordinated yet separately adjustable. Each section gets its own motor and the control system holds the required relationship between them.

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