Physics · Electrical DC Machines
In a DC machine without interpoles, in order to improve commutation as armature reaction shifts the magnetic neutral axis, the brush shift angle must be:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Varied continually with changes in the load current✓
- 2Kept strictly constant at a fixed angle
- 3Maintained exactly at zero degrees relative to the geometric neutral axis
- 4Shifted in the direction opposite to rotation for a generator
Correct answer
Varied continually with changes in the load current
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