engineering recuitment JVVNL Technical Helper 2022 Mock Test Electrician and Wireman Electrical Machines DC Generators

DC जनरेटरचे ब्रश कोणत्या सामग्रीपासून बनवले जातात?

1
कांस्य
2
गनमेटल
3
कार्बन आणि ग्रॅफाइट
4
झिंक कार्बाइड
5
तांबे
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