Engine: Electricity

1. A The wear rate on brushes is proportional to the brush pressure; in other words, the greater the brush pressure the greater the rate of brush wear.
2. B The wear rate on brushes is inversely proportional to the brush pressure; in other words, the lower the brush pressure the greater the rate of brush wear.
3. C There is an optimal pressure range that results in minimal brush wear. Brush pressures above the optimal range cause excessive electrical wear, and brush pressures below the optimal range cause excessive mechanical wear.
4. D There is an optimal pressure range that results in minimal brush wear. Brush pressures above the optimal range cause excessive mechanical wear, and brush pressures below the optimal range cause excessive electrical wear.

Tip: press A-D to answer