The mechanical power is developed by a DC motor is maximum when

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Electrical Engineering XYZ MCQs

The mechanical power is developed by a DC motor is maximum when:

  1. Back EMF is equal to half of applied voltage
  2. Back EMF is equal to applied voltage
  3. Back EMF is equal to twice of applied voltage
  4. None of above

Correct answer: 1. Back EMF is equal to half of applied voltage

Explanation: The mechanical power developed by a DC motor can be calculated as P = VI – EbI, where V is the applied voltage, I is the current, and E_b is the back electromotive force (EMF). The power is maximized when Eb = V/2. This condition allows for the optimal balance between voltage, current, and the motor’s operational characteristics, ensuring that the motor utilizes the electrical input effectively to produce the maximum mechanical power output. When Eb = V/2, the current drawn is maximum under safe operating conditions, leading to the highest mechanical power output.

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