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Master-slave speed control of two drives means

  • A.the master drive supplies power to the slave drive
  • B.the slave follows a reference derived from the master
  • C.both drives receive the same reference from a common source
  • D.the two drives are mechanically coupled with no electrical link

Answer: B

Taking the slave's reference from the master's actual speed keeps the two in step even while the master is changing speed. A common reference would let them diverge during transients, which on a shared web or load would be unacceptable.

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