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The no-volt release of a dc starter protects against

  • A.a reversal of the direction of rotation
  • B.an over-speed caused by a weakened field
  • C.an unattended restart after a supply failure
  • D.an excessive current during the starting period

Answer: C

Losing the supply releases the arm, so the starting resistance is back in circuit when power returns and the machine cannot restart without an operator. It also releases if the field circuit fails on a three-point starter.

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