Why the brushes used in dc machines are made of carbon not from other metal?

3 Answers  

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Will a load of 15A work if we connect it between one phase and earth?

4 Answers  

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How to identify Motor leads in their order coming out from winding without tag (U1, V1, W1 & U2, V2, W2)?

6 Answers   ABB,

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at present how many 765 kv lines are there in india?

5 Answers   Emco,

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Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more

0 Answers  

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if we want ot select cable size with reference to load current it take than what is the formula and it is same for aluminium or copper?

3 Answers  

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Why two phase welding machine is used instead of three phase welding machine.

0 Answers   Merck,

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What are the advantages of a three-phase system over a single-phase system?

0 Answers  

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. How to calculate the Short Circuit Impedance in Transformer? How to calculate the Short Circuit Impedance in Transformer?

0 Answers  

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wats the procedure to calculate no of batteries for ups?

1 Answers  

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How is the air circuit breaker quenching the arc. If it is by air means, where is it come from?

1 Answers  

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Explain few advantages of electric traction system?

0 Answers  

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