What should be included in performing proper...

Question 1 / 205eccefa3bacbc34ba4d4809d

Question 1 of 205eccefa3bacbc34ba4d4809d

What should be included in performing proper maintenance of a D.C. motor's commutator?

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Question 1 of 20

5eccefa3bacbc34ba4d4809d

What should be included in performing proper maintenance of a D.C. motor's commutator?

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🔍 Key Concepts

• Purpose of a commutator in a D.C. motor (providing current to the armature and allowing reversal of current direction) • Proper surface condition of the commutator for good brush contact (smooth, clean, correct film) • Typical maintenance practices: machining/undercutting vs. cleaning vs. coating or lubricating electrical contact surfaces

💭 Think About

• Think about what kind of surface the brushes need to run on for minimum wear and sparking: should it be oily, varnished, bare shiny copper, or have a specific type of film? • Which of these actions is normally done only during major overhaul or machining, and which is done as part of routine preventive maintenance? • Is the thin oxide ‘patina’ on copper usually helpful or harmful for electrical sliding contact surfaces like a commutator?

✅ Before You Answer

• Verify which choice describes routine cleaning or conditioning rather than a one‑time machining/overhaul procedure. • Check if any option would insulate the commutator surface from the brushes (oil film or varnish) – that would be undesirable. • Consider whether removing a normal, smooth brown contact film is recommended, or whether that film is actually beneficial for commutation.

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Question 1 of 20

What should be included in performing proper maintenance of a D.C. motor's commutator?

side-cutting the copper segments and undercutting the mica

coating the copper surface with light machine oil for the first four hours of operation

applying a thin coat of electrical varnish monthly

removing the chocolate brown oxide film from the commutator face

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Question 1 / 205eccefa3bacbc34ba4d4809d

Question 1 of 205eccefa3bacbc34ba4d4809d

What should be included in performing proper maintenance of a D.C. motor's commutator?

Back

Question 1 of 20

5eccefa3bacbc34ba4d4809d

What should be included in performing proper maintenance of a D.C. motor's commutator?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed