Question 273Electricity & Electronics - QMED
70% to passTo effectively clean a commutator in good physical condition, what should be used?
Atrichloride ethylene
Ba canvas wiper
Ckerosene
Da commutator stone
AI Explanation
The correct answer is B) a canvas wiper. To effectively clean a commutator in good physical condition, a canvas wiper should be used. This is the recommended method as it is a soft, abrasive-free material that can gently clean the commutator surface without causing any damage. The other options are not suitable - trichloride ethylene is a harsh chemical that can damage the commutator, kerosene is also a strong solvent that could remove the commutator's protective coating, and a commutator stone is too abrasive and can leave scratches on the surface.
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