what is phase to phase to phase to ground fault

1 Answers  

---

what is the effect come when i changed the alternator exciter field winding DC palority(+ve & -ve)which is coming from AVR.

1 Answers   Wartsila,

---

How synchronous motor helps to improve PF? plz explain

1 Answers  

---

why we use REF and Differential Protection in one transformers?my doubt is both protections are operated in internal fault only.why we want to use 2 protections?please clarify.

7 Answers  

---

why voltages are added when batteries are connected in series?

4 Answers  

---

At the starting of dc motor and syn.motor and induction motor high current flowing through the winding. Due to this the windings burnt out. To avoid this different types of starters are used. But incase of transformer what Will be used (At starting no emf is induced in the primary winding)?

0 Answers  

---

In constant power region of 3-phase IM torque-speed characteristics, if frequency increases flux A does not alter B decreases C increases D none of above

0 Answers  

---

Why it need to form a capcitor when it not been in use from three or two year. Plz describe it technically.

0 Answers  

---

How does a digital electronic meter work??????

0 Answers  

---

If u have Powergrid model question papers Please send to below mail ID rajutheprince@gmail.com

0 Answers  

---

Differenciate between circuit wiring and sub main wiring with illustrations

0 Answers   MU,

---

when we switch on the switch and load is not connected at home,is electricity wasted?

1 Answers  

---