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

Why Ferranti effect is occoured in leading power factor load in a overhead transmission line?

1 Answers  

---

which MPU register provides the address from which the next instruction byte is to be fetch?

1 Answers  

---

why semiconductor fuse used in drive ,not ordinary?

4 Answers   EAP, Essar,

---

What the reson for frequant instantaneous ground over current fault in our sync. Generator... 15 triping in 24 hr...

1 Answers   HCPL, Jhunjhunwala Vanaspati Jhoola, Regen Powertech,

---

CAN ANYBODY PL TELL ME WAT FACTORS CAN CAUSE UNDERVOLTAGE ON A BUS??? PL LIST ALL THE REASONS WITH SOME EXPLAINATION

3 Answers  

---

how to test the ht machines?

0 Answers   ONGC,

---

what is the difference between indoor & Out door substations

5 Answers   HSBC,

---

What are the types of excitation system?

0 Answers  

---

How we can calculate the capacity the Air Condition capacity? like 1 or 1.5 ton's, What is the means of volume of Ton's in capacity of Air Compressor? Why in ton's,? not any other Volume?

2 Answers  

---

How to make vector group test of transformer?

2 Answers  

---

why rotor current reading is taken & why not stator?

4 Answers  

---

what is the consuption rating of motor in one day

1 Answers  

---