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The efficiency of the transmission between motor and load

  • A.affects the referred inertia but not the referred torque of the load
  • B.increases the referred load torque during motoring
  • C.decreases the referred load torque during motoring by the same proportion
  • D.has no effect on the referred load torque at the motor shaft in either direction

Answer: B

Losses in the gearing must be supplied by the motor, so the referred torque is the ideal value divided by the efficiency. During braking the sense reverses and the losses help to retard the load, so the efficiency multiplies instead.

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