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A drive selected on running torque alone may fail to

  • A.achieve the efficiency claimed for it at its rated operating point
  • B.operate within the temperature limits of its insulation
  • C.start its load at all
  • D.reach the correct steady speed once it is running under load

Answer: C

Breakaway friction and the inertia of the load both demand torque in excess of the running value, and a machine chosen without allowance for them may stall on starting. Starting duty is therefore assessed separately from running duty.

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