Motor controller or starter contacts may...

Question 1 / 270705eccefa3bacbc34ba4d480af

Question 1 of 270705eccefa3bacbc34ba4d480af

Motor controller or starter contacts may become pitted and welded together under certain circumstances. What would be the primary cause?

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Question 1 of 27070

Motor controller or starter contacts may become pitted and welded together under certain circumstances. What would be the primary cause?

🔍 Key Concepts

• Electrical arcing when contacts open or close • Effect of speed and pressure of contact movement on heat and pitting • Difference between what happens when contacts open vs close under load

💭 Think About

• When is an electrical arc more likely to be long-lasting and destructive: during a fast, firm contact action or a slow, gentle one? • How does breaking current under load affect the surface of contacts compared to just making the connection? • Which condition would most increase heat at the contact point and tend to weld metal surfaces together?

✅ Before You Answer

• Identify which options involve slow vs. fast movement of the contacts • Determine which action is happening under load (current flowing) and whether the load is being made or broken • Consider which situation would create sustained arcing and heat right at the contact faces

Question 1 of 27070

Motor controller or starter contacts may become pitted and welded together under certain circumstances. What would be the primary cause?

open under loaded conditions

close slowly with light pressure

open too quickly and arc

close quickly with proportionate pressure