why we use carbon brush in exciter&genrator?

Answers were Sorted based on User's Feedback

why we use carbon brush in exciter&genrator?..

Answer / hemanshu

beacause carbon contact resistance is too low 0.7 ohm. so its use for exitation of motor & generator.

Is This Answer Correct ?    0 Yes 0 No

why we use carbon brush in exciter&genrator?..

Answer / kawsar ahmed

We use carbon brush with commutator and slip ring, because carbon has negative coefficient of heat. That means when heat increase carbon brush resistance do not increase.
Another reason is carbon friction loss is less then other element.

Is This Answer Correct ?    0 Yes 0 No

why we use carbon brush in exciter&genrator?..

Answer / ramesh

Brushes are used in Exciter to facilitate current in
revolving rotor where Field winding is placed. In generators
for Rotor earth fault and as earth to remove any static
current induced in the rotor.

Is This Answer Correct ?    1 Yes 2 No

why we use carbon brush in exciter&genrator?..

Answer / raul

brushes r the means of supplying the direct current from
the commutator to the external load ........n the contact
resistance is an important factor which plays an important
role. in dc generators, carbon brushes also helps in
improving commutation

Is This Answer Correct ?    0 Yes 1 No

why we use carbon brush in exciter&genrator?..

Answer / sreeknp

normally brushes are of carbon it is a semiconductor its
resistance decreases with temperature, then self lubricant
this is the reason

Is This Answer Correct ?    0 Yes 2 No

Post New Answer

More Electrical Engineering Interview Questions

what modulation is used in landline telephone signals?

2 Answers  


2 Answers  

in 6.6 kv vaccum circuit breaker vaccum bottole vaccum capacity ????

0 Answers   Divis Laboratories,

Define protection core in CTs Ex. 5P10, 5P20 etc.

1 Answers   HPL,

This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

2 Answers  

What is meant by sotf,lbb,power swing,pole discrepency,auto reclose?

1 Answers   TCS, TNEB Tamil Nadu Electricity Board, Electrical, Omega, Bunge,

A power transformer 4MVA/11KV/0.415Kv has been out of use in 12years. what maintenance actions/test need to be carried out before energizing.

0 Answers  

what is negative,positive abd zero sequence current explain clearly

1 Answers   Jindal,

What is mean demand of the Plant?

2 Answers  

What are the criteria shall be considers for sizing Fuse and MCB? If the rated current is 10Amps what should be the fuse size / MCB Size?

0 Answers  

what is let through energy of mccb

2 Answers  


1 Answers   BPL,

  • Civil Engineering Interview Questions Civil Engineering (5038)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4248)
  • Electrical Engineering Interview Questions Electrical Engineering (16423)
  • Electronics Communications Interview Questions Electronics Communications (3525)
  • Chemical Engineering Interview Questions Chemical Engineering (959)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (192)
  • Bio Engineering Interview Questions Bio Engineering (95)
  • Metallurgy Interview Questions Metallurgy (360)
  • Industrial Engineering Interview Questions Industrial Engineering (253)
  • Instrumentation Interview Questions Instrumentation (2962)
  • Automobile Engineering Interview Questions Automobile Engineering (328)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (90)
  • Marine Engineering Interview Questions Marine Engineering (107)
  • Power Plant Engineering Interview Questions Power Plant Engineering (170)
  • Textile Engineering Interview Questions Textile Engineering (198)
  • Production Engineering Interview Questions Production Engineering (0)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (89)
  • Engineering AllOther Interview Questions Engineering AllOther (1375)