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A load with a very high starting torque requirement and no need for speed control at all is best served by

  • A.an eddy current coupling with adjustable excitation
  • B.a machine chosen for its starting characteristic alone
  • C.a variable-frequency converter of the full machine rating
  • D.a fluid coupling with scoop control

Answer: B

If the speed never has to be varied, paying for a converter or a coupling buys nothing, and a machine with a suitable characteristic and a starter will do. A soft starter may still be worth having to limit the current transient.

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