why is power supplied in 3 phase only? why not in 2 or 4 phases?

11 Answers  

---

why ac supply neutral should earth not in dc (-)

2 Answers  

---

why transformer not work in dc

16 Answers  

---

What is the method for testing the differential protection stabilty in generator? When the time of starting What will happen if differentail protection connection wrong means?

0 Answers   JSW,

---

Practical condition in 400KV Sub station:- Breaker(open) , isolator(open), Earthing (close) at both end e.g A & B. Now Open A Stn Earthing than Open B stn Earthing (Which have a 50MVA reactor) , AND suddenly show R,Y,B phase 704KV,573KV,118KV respectively. Que is without closing of breaker how it is possible.???? My Whats app No:07621840498 for Further Discussion. Pls experts suggest.

0 Answers  

---

can we run a motor rated 50Hz,415vac,1440RPM At higher speed then rated on name plate with the help of VFD /drive on long term basis.wheater it will effect the motor life

3 Answers  

---

plz explain TSM and PSM.with example suppose ct ratio is 4000/5 and tsm is .15 and plug is at 3.75 if fault current is 8000A.so how i find relay oprating time.

2 Answers   College School Exams Tests, ME,

---

?? how to calculate lighting system ????

1 Answers   L&T, Synergy,

---

What are approaches to tackle sedimentation problem of reservoir?

0 Answers  

---

2 v/500amp/hr to 1.80vpc at 20 degree celsious 2v/5ooamp/hr to 1.75 vpc at 77degree farren .this is the capacity of a battery .what is the meaning of this . can i get a detailed explenation

0 Answers  

---

What is the difference between KW & KVA ?

10 Answers  

---

what is the write prosidure of stringing of 8meter pcc pole.

0 Answers  

---