When a megohmmeter is used to test the...

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Question 1 of 205eccefa4bacbc34ba4d48404

When a megohmmeter is used to test the insulation of a large motor, what causes the initial dip of the pointer toward 'zero'?

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5eccefa4bacbc34ba4d48404

When a megohmmeter is used to test the insulation of a large motor, what causes the initial dip of the pointer toward 'zero'?

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🔍 Key Concepts

• Megohmmeter operation – what the meter actually measures when you first apply voltage to a large motor winding • Capacitance of motor windings – how a long length of conductor wound in coils behaves electrically • Insulation behavior over time – difference between a brief transient effect and true leakage or absorption

💭 Think About

• When you first connect and crank a megohmmeter on a large motor, is the current you see at that instant steady, or does it quickly change? What kind of electrical behavior causes a brief surge that then dies away? • Think of the motor windings like two plates separated by insulation. In that model, what happens the moment you apply a DC voltage across them? • Which of the choices would cause a continuous low-resistance reading, and which would only affect the meter for a short time at the start of the test?

✅ Before You Answer

• Identify which option would create a momentary charging current instead of a continuous leakage current. • Decide which effect is inherent in all large windings, even if the insulation is perfectly clean and dry. • Eliminate any choices that describe long-term or steady leakage problems, since the question asks about the initial dip toward zero.

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Question 1 of 205eccefa4bacbc34ba4d48404

When a megohmmeter is used to test the insulation of a large motor, what causes the initial dip of the pointer toward 'zero'?

Back

Question 1 of 20

5eccefa4bacbc34ba4d48404

When a megohmmeter is used to test the insulation of a large motor, what causes the initial dip of the pointer toward 'zero'?

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

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