What should be used in the cleaning of a...

Question 1 / 270705eccefa3bacbc34ba4d4809c

Question 1 of 270705eccefa3bacbc34ba4d4809c

What should be used in the cleaning of a D.C. propulsion motor's commutator face?

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Question 1 of 27070

Q

What should be used in the cleaning of a D.C. propulsion motor's commutator face?

🔍 Key Concepts

• Material compatibility with copper commutators • Effects of abrasive materials on electrical equipment • Purpose of commutator maintenance (smoothing, not scoring)

💭 Think About

• Which material will clean and smooth the commutator without embedding conductive or magnetic particles into the surface? • Which of these options is specifically designed for use on electrical rotating machinery, rather than general-purpose polishing? • What could happen to brushes and commutator segments if a material that sheds hard grit is used?

✅ Before You Answer

• Eliminate any choice that can leave embedded metal or abrasive particles in the commutator surface • Consider which material is standard practice in electrical maintenance manuals for D.C. motors • Ask whether the material will round and smooth the surface instead of scratching or grooving it

Question 1 of 27070

Q

What should be used in the cleaning of a D.C. propulsion motor's commutator face?

A

a canvas wiper

B

emery cloth

C

abrasive dressing stones

D

sandpaper

Question 1 / 270705eccefa3bacbc34ba4d4809c

Question 1 of 270705eccefa3bacbc34ba4d4809c

What should be used in the cleaning of a D.C. propulsion motor's commutator face?

Back

Question 1 of 27070

Q

What should be used in the cleaning of a D.C. propulsion motor's commutator face?

🔍 Key Concepts

• Material compatibility with copper commutators • Effects of abrasive materials on electrical equipment • Purpose of commutator maintenance (smoothing, not scoring)

💭 Think About

• Which material will clean and smooth the commutator without embedding conductive or magnetic particles into the surface? • Which of these options is specifically designed for use on electrical rotating machinery, rather than general-purpose polishing? • What could happen to brushes and commutator segments if a material that sheds hard grit is used?

✅ Before You Answer

• Eliminate any choice that can leave embedded metal or abrasive particles in the commutator surface • Consider which material is standard practice in electrical maintenance manuals for D.C. motors • Ask whether the material will round and smooth the surface instead of scratching or grooving it