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Which of these determines the quadrant in which a drive is operating?

  • A.The signs of its speed and its torque
  • B.The magnitude of its speed alone
  • C.The magnitude of the load torque alone
  • D.The moment of inertia of its rotating parts

Answer: A

The pair of signs locates the operating point in the torque-speed plane, and their product gives the direction of power flow. Magnitudes decide how far out along the axes the point lies but not which quadrant it is in.

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