When a megohmmeter is used to test the...

Question 1 / 205eccefa4bacbc34ba4d48404

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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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'?

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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 20

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

good insulation

the capacitance of the windings

the leakage of the current along the surface of dirty insulation

the dielectric-absorption effect of the insulation

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Question 1 / 205eccefa4bacbc34ba4d48404

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

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

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