What is a useful instrument for checking...

Question 1 / 205eccefa3bacbc34ba4d47f3d

Question 1 of 205eccefa3bacbc34ba4d47f3d

What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents?

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Question 1 of 20

5eccefa3bacbc34ba4d47f3d

What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents?

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🔍 Key Concepts

• 3-phase AC motor currents and how to detect imbalance in each phase • How a clamp-on measuring device works around individual conductors • Difference between instruments that measure current vs those that measure insulation resistance or frequency

💭 Think About

• Ask yourself: which instrument can easily measure the current in each of the three individual phase conductors without breaking the circuit? • Which option is specifically designed to measure current magnitude in a live conductor by encircling it, rather than touching bare metal? • Which instruments in the list are used for other purposes such as checking frequency or insulation resistance, not load current balance?

✅ Before You Answer

• Verify which choice is actually an ammeter-type device intended for current measurements in each phase line. • Eliminate any instruments whose primary function is to measure frequency or insulation resistance instead of load current. • Check which device is commonly used on ships by electricians to quickly compare phase currents under normal running conditions.

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Question 1 of 20

What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents?

vibrating-reed frequency meter

hand or battery-operated megger

D'Arsonval iron-vane probe

clamp-on ammeter

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Question 1 / 205eccefa3bacbc34ba4d47f3d

Question 1 of 205eccefa3bacbc34ba4d47f3d

What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents?

Back

Question 1 of 20

5eccefa3bacbc34ba4d47f3d

What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents?

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