When a megohmmeter is used to test...

Question 1 / 270705eccefa4bacbc34ba4d48408

Question 1 of 270705eccefa4bacbc34ba4d48408

When a megohmmeter is used to test insulation, what condition causes the gradual rise of the pointer reading as a result of continued cranking?

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Question 1 of 27070

When a megohmmeter is used to test insulation, what condition causes the gradual rise of the pointer reading as a result of continued cranking?

🔍 Key Concepts

• Megohmmeter (megger) operation and what its pointer indicates • How insulation behaves electrically over time when a test voltage is applied • Difference between surface leakage, inductance, and dielectric absorption in insulation testing

💭 Think About

• Think about which phenomenon would make the resistance value appear to increase gradually (pointer rising) as you keep cranking, instead of jumping immediately to a steady value. • Consider what happens inside the insulation material itself when a DC test voltage is applied for several seconds, and how that differs from current leaking on the surface. • Ask yourself: which option describes a time‑dependent effect within the bulk insulation, not just a static resistance or reactance?

✅ Before You Answer

• Verify which choice refers to a property of the insulation material itself, not the winding or external dirt. • Check which phenomenon is specifically associated with time-dependent charging and polarization in insulation when using a DC megohmmeter. • Eliminate any option that would mainly cause a steady, immediate reading rather than a gradual rise as cranking continues.

Question 1 of 27070

When a megohmmeter is used to test insulation, what condition causes the gradual rise of the pointer reading as a result of continued cranking?

good conductor resistance

the leakage of current along the surface of dirty insulation

the inductive reactance of the windings

the dielectric-absorption effect of the insulation

Question 1 / 270705eccefa4bacbc34ba4d48408

Question 1 of 270705eccefa4bacbc34ba4d48408

When a megohmmeter is used to test insulation, what condition causes the gradual rise of the pointer reading as a result of continued cranking?

Back

Question 1 of 27070

When a megohmmeter is used to test insulation, what condition causes the gradual rise of the pointer reading as a result of continued cranking?