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A cumulatively compounded dc motor suits

  • A.position control axes requiring the finest resolution
  • B.loads that must be driven at exactly synchronous speed
  • C.punch presses and rolling mills with fluctuating loads
  • D.constant-speed duty where no torque surge occurs

Answer: C

The falling speed under a load peak lets the flywheel effect of the rotating mass supply part of the surge, and the shunt winding keeps the light-load speed in bounds. It is the classic machine for a load that comes in bursts.

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