When a self-excited DC generator's field has...

Question 1 / 2066636eed28f7522a1c51da3e

Question 1 of 2066636eed28f7522a1c51da3e

When a self-excited DC generator's field has lost its residual magnetism due to a prolonged idle period, it will fail to produce a voltage. Flashing the field is the procedure used to restore the residual magnetism. Using a 12 volt storage battery, how is this performed?

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🔍 Key Concepts

• Self-excited DC generator: which winding provides the magnetizing force? • Difference between armature (A1/A2), series field (S1/S2), and shunt field (F1/F2) leads • Purpose of flashing the field: restoring residual magnetism in the correct direction of polarity

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• Which part of the generator actually creates and maintains the magnetic field that needs residual magnetism? • If you want to re-establish the correct polarity of the field, which pair of leads should the battery current pass through? • How does the direction of current from the battery relate to the desired polarity of the generator’s field?

✅ Before You Answer

• Identify which leads (A, S, or F) belong to the field winding that holds residual magnetism • Confirm that the battery is connected so current flows through the proper winding, not through the armature • Check that the battery polarity is applied to the correct terminal to establish the desired field direction

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Question 1 of 20

The A1 and A2 leads are disconnected from the generator. The A1 lead is connected to the positive terminal of the battery, and the A2 lead is connected to the negative terminal.

The S1 and S2 leads are disconnected from the generator. The S1 lead is connected to the positive terminal of the battery, and the S2 lead is connected to the negative terminal.

The F1 and F2 leads are disconnected from the generator. The F1 lead is connected to the positive terminal of the battery, and the F2 lead is connected to the negative terminal.

Question 1 / 2066636eed28f7522a1c51da3e

Question 1 of 2066636eed28f7522a1c51da3e

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Question 1 of 20

66636eed28f7522a1c51da3e

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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