Which of the following factors improve commutation in a dc machine ?
- High contact resistance of brushes
- High inductance of the coils undergoing commutation
- Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor
- Narrow width for the commutation bars
Select the correct answer using the codes given below : Codes :
A. 1, 2, and 3
B. 1 and 3
C. 2, 3 and 4
D. 1, 2 and 4
Show Answer
Answer: B
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