As a DC armature revolves within a...

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Question 1 of 205eccefa3bacbc34ba4d47e38

As a DC armature revolves within a stationary magnetic field, the reversals of magnetization of the armature core lags the current reversals which produces heat. What is the correct name for this action which is minimized by the use of soft silicon steel?

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🔍 Key Concepts

• Magnetic properties of the armature core in a DC machine • Difference between losses due to current flowing in conductors vs. changing magnetization in iron • Why silicon steel is added to reduce certain core losses

💭 Think About

• Ask which of the listed losses is specifically associated with the lagging of magnetic flux density behind the magnetizing force in iron. • Consider which loss is tied to resistance in copper windings and which are related to the iron core itself. • Think about what effect laminating the core versus changing the core material (e.g., adding silicon) is intended to reduce.

✅ Before You Answer

• Identify which options are core (iron) losses versus winding (copper) losses. • Recall which phenomenon is associated with repeated magnetization and demagnetization cycles in the core material. • Check which type of loss is directly reduced by using soft, high‑grade silicon steel rather than by laminating the core.

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