Answer / sanjeet

due to residual magnetic present in the rotor core

Answer / gopaul

initially we need three phase supply from the grid for
excitation.we have to start the motor as a generator,and
then by using the external energy we have to increase the
speed of the motor above syn speed.after that it starts
working as a induction generator

Answer / mina adeeb

yes i agree, it generates power due to the residual flux
in the rotor but without excitation i can't get high power
because a small flux

In India why is the supply frequency 50hz? I need a particular answer for it..

3 Answers  

---

1 HP = how many Kva

5 Answers  

---

why synchronous motor has zero starting ?

8 Answers   NTPC,

---

to improve the existing power factor whether capacitors have to be added in series or parallel.and why

3 Answers  

---

3 phase supply is there Total kw 100 howmuch cable put the load

3 Answers  

---

What, in the construction of a transformer, controls KVA? For example 600/208/120 V transformer can be 10kVA or 45kVA!!! What do we change in the construction of a Transformer in order to change the rating but not the voltage.

1 Answers  

---

What are the conditions to be satisfied before connecting two DC generators in parallel?

9 Answers   Bhel, Godrej,

---

In separetly excited m/c,we excite the field by a dc source,what not with ac source?

2 Answers  

---

How a ship getting grounded

2 Answers   Deltin Jaqk,

---

how to reduce power loss when the tranmission under long distance?

19 Answers  

---

why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it is multiplied with sqrt2 ie 6.35 KV*sqrt2=8.9 kv we will select 9kv.my question is why we are multiplying with sqrt 2?

1 Answers   KSPL,

---

What are effect of radio system in DCS Distributed control system ?

1 Answers   Sabic,

---