Answer / nikhil s shah

Carbon brushes are used to connect external circuits in a
motor or any other machine to the rotor (moving part of the
machine) through the commutator. You can also say that
these brushes transfer electric current to moving part of
the motor or machine.....

Answer / ajayk

yes reason is commutation
but then .we can also use
metal brushes.why dont we
use then. Reason is 1.carbon
has high resistance which
decreases the time constant
of sparking transients during
commutation,so less sparking
and 2.they are cheap too and
long lasting.

Answer / kj

The other reason is that carbon powder is also a lubricant.
This reduces the wear on the commutator.

what is advertised hop count

0 Answers  

---

Which type of transformer used in lighting load?

2 Answers   IMFA,

---

Which type starter is used for synchronous motor?

2 Answers   Equate,

---

what is the efficiency of thyristor

0 Answers  

---

what is stray loss in transformer?

19 Answers   Vijai Electricals,

---

Why we use parllel operation of alternator

1 Answers  

---

How to take vector group test of a transformer? Suppose we dont know the vector group of transformer, how to check its vector group through test? I have 3 transformer DYn11 & DYno& Ynd11, how to confirm its vector group?

1 Answers  

---

how to calculate cable bending angle in a trench?

2 Answers   Eastern Cement,

---

How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.

0 Answers   Grasim,

---

Why dc shunt motor in lathe, compound motor in rolling mills

1 Answers  

---

Explain the Term in CT Name Plate – Class: 5P10

6 Answers  

---

What are the types of the glands and difference between single and double compression type of cable Glands.

0 Answers   ABC, All Trades Electrical,

---