Electrical Engineering · DC Machines
Which combination of factors causes a significant reduction in the insulation resistance of DC machines during continuous full-load operation?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Decreased continuous running hours and enhanced forced ventilation
- 2Reduced ambient operating temperature and perfectly clean surroundings
- 3Intermittent operation with periodic prolonged shutdowns
- 4Winding temperature rise, atmospheric moisture absorption, and accumulation of dust and dirt✓
Correct answer
Winding temperature rise, atmospheric moisture absorption, and accumulation of dust and dirt
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