Answer / aravind

the reason for using carbon brushes is it has resistance which is good enough for avoiding sparking during commutaion.This feature is also present in copper but frequently carbon is used

Answer / niranjan reddy

because the carbon is of less cost. and as frequent wear and
tear will occur to the brush due to rotation of the
motor...carbon is most economical.
and frm conduction point of view also it is good..so carbon
is used

what is the formula for building wiring to get the main breaker.

1 Answers  

---

How much inductance or resistance require as a starter in series with induction motor of specific capacity(e.g. 5 hp) ? What is formula for it ?

0 Answers   Reliance,

---

Reversal of corrent feature in MCCB- What is reversalof current -explain broadly.

1 Answers  

---

What is clock position of Transformer?what are the clock positions are there?and what is different of them?

0 Answers   Synergy,

---

Why there are semi conductor layers on conductor and XLPE insulation of HT cables

1 Answers  

---

---

what will happen if phases are not shorted with neutral in transformer impedance test? and if neutral is not connected with ground?

1 Answers  

---

what is diff kav & kvarh?

3 Answers  

---

Why the suply frequency in INDIA is 50HZ

5 Answers   HCL,

---

Why the underground cables will Punchar? or what is the reason to burst the underground cables?

1 Answers  

---

What is maximum power transfer theorem?

0 Answers  

---

Whats the difference between three phase and single phase?

4 Answers  

---

why armature is placed in stator but not in rotor in synchronous generator ?

2 Answers   Student,

---