In order to definitively determine whether...

Study

Question 1 of 205eccefa4bacbc34ba4d482ef

In order to definitively determine whether or not fuse "3", shown in the illustration is blown using an on-line testing technique, across what points would you connect the voltmeter leads? See illustration EL-0062.

Back

Question 1 of 20

5eccefa4bacbc34ba4d482ef

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

• On-line fuse testing means checking voltage with the circuit ENERGIZED, not removing the fuse • Difference between the line side (top) and load side (bottom) of each fuse in the 3‑phase fused disconnect • How a blown fuse affects voltage at the bottom terminal when a 3‑phase motor and other phases are still energized (backfeed/ghost voltage)

💭 Think About

• For each answer choice, imagine fuse 3 is GOOD: what voltage should you expect on your meter between those two points in a normal 3‑phase system? Now imagine fuse 3 is BLOWN: would the reading be clearly different, or could it look the same because of backfeed through the motor and the other two fuses? • Which pair of test points makes your voltmeter effectively read the voltage drop across fuse 3 itself (or something obviously equivalent), rather than just measuring between two live phases that will look the same whether the fuse is good or bad? • If fuse 3 is blown, what happens to the bottom of fuse 3 compared with the tops of the fuses that are still connected directly to the source? Does that help you get a full line‑to‑line voltage across the open fuse?

✅ Before You Answer

• Identify clearly which terminals are on the line side vs. load side of each fuse in the illustration. • For each option, ask: if fuse 3 were blown, would I definitely see full line voltage across fuse 3, and if it were good, would I see zero (or very small) voltage? • Watch for choices that only compare line-to-line points that are always energized, regardless of whether fuse 3 is good or blown; those will NOT let you know the condition of fuse 3.

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

Quick actions

— No credit card needed