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A machine described as having a high slip design will have

  • A.a permanent magnet rotor of high coercivity
  • B.a rotor of relatively high resistance
  • C.a rotor of relatively low resistance and high reactance
  • D.no rotor windings or bars at all in its construction

Answer: B

Raising the rotor resistance moves the torque peak towards standstill and increases the full-load slip, which suits punch presses and hoists needing a soft characteristic. The penalty is greater rotor loss at rated load.

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