Why DC excitation is used for alternators? Why cant it be AC?
- 35 Answers
- 69686 Views
- ABB, Ace Info, Alstom, Shalivahana Power, I also Faced
- E-Mail Answers
Answer Posted / ashokreddyreguri
Rotor of the alternator is given dc supply so constant
magnetic poles are formed.These constant magnetic poles
produce constant flux.The rotor of the alternator is
rotated by using prime mover,so constant poles are
rotated,so these rotating magnetic poles produce rotating
magnetic field.When this rotating magnetic field cuts three
phase stator conductors produces three phase supply.
| Is This Answer Correct ? | 28 Yes | 6 No |
Post New Answer View All Answers
If a current -8+6sin6t is flowing three ammeter, one is a centre zero PMMC meter, one is true rms meter and one is moving iron meter. What are the reading of these three meter respectively?
we have a rewind motor of 2Hp,2800Rpm, 220Volt AC. how can we choose the running capacitor for this motor, any formula for that?
we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.
please explain to me how to calculate current,voltage,resistance with formula??
how will reduce the voltage. if 12volt/250ma transformer toreduce 6 volt
what is V.L.F. testing of power cable? do you know the voltage ratings, like for what rating and size of cable what rating of V.L.F. testing is used?
Draw the equivalent circuit of crystal oscillator?
defination of transistor controlled series capacitor
High speed earth switch operation with diagram
What is genrally the % Impedance of a Dg set? How can we calculate Earthing conductor size for a DG set?
is there any device that works properly accept relay, it may be fuse but if i want fuse of 33kv 300 amp it is avaliable, pls give me details
ACB & VCB how do work and saftes and how can maintenance in this and parts name show with picture
I have finish diploma electronics and five years experience in electrical field in ht service how can i get c licensce or other electrical certificate
advantages & disadvantages of Lagging and leading power factor .
bsnl tta exam question
