Question 513Electricity & Electronics - QMED

The correct answer is D) radial mount. In a bidirectional motor, the brush holder needs to be able to accommodate the motor's ability to rotate in both forward and reverse directions. A radial mount brush holder is the appropriate choice, as it allows the brushes to maintain contact with the commutator in either direction of rotation. The other options would not be suitable for a bidirectional motor. A trailing mount brush holder would only work in one direction, while a leading mount or both leading and trailing mount would not provide the necessary flexibility for the brushes to maintain contact in both directions of rotation.