Answer Posted / nishant2110

Noise in transformr is caused by MAGNETOSTRICTION.

magnetostriction is process of slight changing physical size
of magnetic material when kept in varying magnetic field.

Since gap due to bad insulation and bad stacking factor give
sufficient place for core to vibrate in between due to
change in its size

if the armature current in a dc generator is ac ( sinusoidal ) why doesnt the sjhape af armature mmf a sinusoidal (ni) ? armature mmf in case of a dc machine is triangular.

1984

---

What happens if we give the supply to the rotor of induction motor and make its terminal shorted?

4079

---

what is active power & reactive power?

2194

---

Define norton equivalent circuit?

1055

---

what reactive how to maintain

1848

---

I have 2500KVA transformer delta/star,13.8KV/380V provided with LV 4000A breaker. Already I have 2300KW motor feeder with a full load 90%. Is it possible to connect another 1600A from that breaker? If so how the calculation is done?

3816

---

Usage of flywheel diode in relays

1931

---

what is mind in cable

2075

---

What are the protections for safe running of electric generator?

2272

---

what is the difference between switch yard to residential area.and how much required it.

1776

---

hi there i am highly enthusiastic about discussing electrical concepts , and hence i wud lyk to invit al do intrested to join me at gtalk and hav a dscussun of the concepts , ad me as a freind . my email id is rakesh.2k99@gmail.com

2103

---

Sir, I have applied for the of Jr.engineer(Electrical & Electronics) & ASST. LOCO PILOT at ALL RRB BOARDS. please send me all RRB Boards solved papers in the year of 2001 tO till date. i requested send me the papers to my id as soon as possible (jet_0991@yahoo.com). (This is very urgent) Thank You,

1848

---

Convert a star connected network into a delta connected network.

1123

---

What is an order of a system.

1346

---

Give some example of fault limiting devices?

1367

---