If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is
A. 115 V
B. 200 V
C. 230 V
D. 460 V
Show Answer
Answer: A
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The correct answer is A. The back EMF for maximum power developed is half of the applied voltage, which is 115 V.
In a DC machine, the back electromotive force (EMF) is the voltage generated in the armature winding due to the rotation of the armature in the magnetic field. The back EMF opposes the applied voltage and determines the amount of current flowing through the armature.
For maximum power developed in a DC machine, the armature current should be at its maximum value. This occurs when the back EMF is equal to half of the applied voltage.
Therefore, if the applied voltage to the DC machine is 230 V, the back EMF for maximum power developed would be half of that, which is 115 V.