When brush pressure is too what, mechanical wear is the result and higher brush temperatures can promote wear?

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Multiple Choice

When brush pressure is too what, mechanical wear is the result and higher brush temperatures can promote wear?

Explanation:
Brush contact pressure must be kept within a design range. When the pressure is too heavy, the brush is pressed harder against the commutator, which increases friction. That extra rubbing causes mechanical wear of the brush material itself and also wears the commutator surfaces. The added friction also generates more heat at the contact, and higher temperatures accelerate wear, degrade the brush material, and can lead to glazing or other damage. So, excessive pressure directly links to greater mechanical wear and heat-driven wear mechanisms.

Brush contact pressure must be kept within a design range. When the pressure is too heavy, the brush is pressed harder against the commutator, which increases friction. That extra rubbing causes mechanical wear of the brush material itself and also wears the commutator surfaces. The added friction also generates more heat at the contact, and higher temperatures accelerate wear, degrade the brush material, and can lead to glazing or other damage. So, excessive pressure directly links to greater mechanical wear and heat-driven wear mechanisms.

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