Brushes of D.C. machines are made of Options: A . &nbspCarbon B . &nbspSoft copper C . &nbspHard copper D . &nbspAll of above

Brushes of D.C. machines are made of

Question

Brushes of D.C. machines are made of

Options:

A . Carbon

B . Soft copper

C . Hard copper

D . All of above

Answer: Option A

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Question 1. Lap winding is composed of....

Question 2. Wave winding is composed of....

Question 3. The commutator segments are connected to the armature conductors by means of....

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Question 5. Open circuited armature coil of a D.C. machine is....

Question 6. In lap winding, the number of brushes is always....

Question 7. The number of brushes in a commutator depends on....

Question 8. Which of the following generating machine will offer constant voltage on all loads?....

Question 9. D.C. generator generally preferred for charging automobile batteries is....

Question 10. To avoid formation of grooves in the commutator of a D.C. machine....

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