Motor starter or controller contacts may...

Question 1 / 270705eccefa4bacbc34ba4d4850f

Question 1 of 270705eccefa4bacbc34ba4d4850f

Motor starter or controller contacts may become welded together under what condition?

Question 1 of 27070

Motor starter or controller contacts may become welded together under what condition?

🔍 Key Concepts

• Electric motor starters and contactors – how contacts open/close under load • Arcing and heat buildup when starting large motors • Effect of high current vs. mechanical motion/pressure on contact surfaces

💭 Think About

• Which option would cause enough heat at the contact surface to actually fuse (weld) metal together, rather than just cause wear? • Think about what happens to current when a large motor first starts – is it higher or lower than running current, and how does that affect contacts? • Which options are mainly about mechanical movement, and which are mainly about electrical load and heating?

✅ Before You Answer

• Identify which choice directly involves very high current through the contacts rather than just how fast they move • Consider which situation would create sustained intense arcing/heat at the instant of closing • Eliminate any options that don’t clearly connect to overheating of the contact surfaces

Question 1 of 27070

Motor starter or controller contacts may become welded together under what condition?

open too quickly and arc

close under excessive pressure

open or close too quickly

close under excessive starting current