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English Translations » 电气工程圈 » 【Daily Topic】【Electrical Edition 20170512】

【Daily Topic】【Electrical Edition 20170512】

2017-05-12View Original

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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: What is the method for adjusting the speed of a DC motor? ( ) A. Only change the positive and negative terminals of the power supply to the excitation winding. B. Change the positive and negative terminals of both the excitation winding and the armature winding simultaneously. C. Change the magnitude of the current in the excitation winding. C
Reply #22017-05-12
C. Changing the magnitude of the excitation winding current
Reply #32017-05-12
C. Changing the magnitude of the excitation winding current

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Translated at 2026-07-23 01:50:58

Original: https://bbs.hcbbs.com/thread-1778127-1-1.html

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