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The four quadrants of drive operation are defined by the signs of

  • A.voltage and current at the terminals of the motor being considered
  • B.the inertia and the load torque of the driven machine
  • C.the supply frequency and the motor slip in the machine
  • D.speed and torque

Answer: D

Plotting torque against speed divides the plane into four, and the sign of their product tells whether power flows into or out of the machine. That product, rather than either quantity alone, is what distinguishes motoring from braking.

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