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The no-load speed of a separately excited dc motor is approximately

  • A.\( V/k\phi \)
  • B.\( V/k\phi I_a \)
  • C.\( I_aR_a/k\phi \)
  • D.zero

Answer: A

With the current nearly zero, the resistive drop vanishes and the speed is set by voltage and flux alone. The drop from that value to the loaded speed is the machine's speed regulation, which is small in a shunt or separately excited machine.

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