Brush holders should be evenly _______ or _______ around the commutator.

Brush holders should be evenly _______ or _______ around the commutator.

• A. Spaced and Quartered
• B. Aligned and Spaced
• C. Evenly arranged
• D. Mounted and rotated

Answer: (A)

Distributing the brush holders evenly around the commutator is essential for even wear and smooth operation. Spacing them evenly and quartering them means placing the brushes at four equal angular positions around the circle (about 90 degrees apart). This balances the current paths, so each brush takes a similar load and contacts different commutator segments in a balanced way. The result is uniform wear, reduced sparking and pitting, and less torque ripple. If brushes were only on one line or merely “evenly arranged” without the deliberate four-way (quartered) positioning, wear would be uneven and sparking could increase.

Distributing the brush holders evenly around the commutator is essential for even wear and smooth operation. Spacing them evenly and quartering them means placing the brushes at four equal angular positions around the circle (about 90 degrees apart). This balances the current paths, so each brush takes a similar load and contacts different commutator segments in a balanced way. The result is uniform wear, reduced sparking and pitting, and less torque ripple. If brushes were only on one line or merely “evenly arranged” without the deliberate four-way (quartered) positioning, wear would be uneven and sparking could increase.