Why we use Carbon & graphite mixxed brushes in the DC motor?

Answer Posted / prasad

THE PURPOSE OF CARBON BRUSHES ARE TO POLISHING THE SURFACE
OF THE COMMUTATOR AND TO REDUCE THE REACTENCE AT THE
COMMUTATOR.

Is This Answer Correct ?    6 Yes 6 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what maximum range of star & delta in hp or kw ?

1265


Can anyone provide with a SLD for HT panel installation for a 33KV line and distribution end has three 1.5MV transformers. Is it suitable to use OCB or VCB and also provide me the suitable rating and its connection diagram.

2881


what is Fan Control Cubicle

1873


WHAT WOULD BE THE FORMULA OF WIRE GAUGE FOR A FULL LOAD CURRENT

1682


What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

982






a starter used for squirrel cage induction motor?

1204


I have 2 KW electric water heater.I am gonna use it in controlling water temp.so I needed to increase or decrease the heating capacity.is there any electrical-electronic circuit for varying the resistance & so current?

2567


hi can anyone pls tell me the eee interview core questions asked in l&t

1539


What is the tension required for the 25000 CFM AHU belt

2045


how to calculate magnetic force genrated by a coil ?

1719


why single phase to grd test in HV cable?why not 2 phase at a time?

1807


TCS IS IT COMPANY THEN WHY DO THEY NEED ELECTRICAL &ELECTRONICS ENGINEERS?

1466


What is CCT (Correlated Color Temperature) ?

1493


how we can calculate 2 phase welding transformer rating or total power?

1398


What is voltage ratio of a transformer?

627