Electrical Engineering XYZ MCQs
The polarity of a DC generator can be reversed by:
- Reversing the field electric current and also the direction of rotation
- Reversing the field current
- Increasing the field current
- None of the above
Correct answer: 2. Reversing the field current
Explanation: The field winding in a DC generator creates the magnetic field necessary for induction. By reversing the direction of the electric current flowing through the field winding, the polarity of the magnetic field is reversed. This, in turn, reverses the direction of the induced EMF, leading to a change in polarity of the generated voltage.