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For the speed of a running drive to fall, the torque developed by the motor must be

  • A.reverses in direction while remaining equal to the load torque in magnitude
  • B.is less than the load torque
  • C.exceeds the load torque at the speed the drive has currently reached
  • D.is exactly equal to the load torque at every speed within its range

Answer: B

A deficit of torque leaves the load torque to retard the inertia, and the drive slows until a new balance is found. Deliberately creating such a deficit, by reducing the motor torque or by braking, is how a drive is brought to rest.

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