Why DC excitation is used for alternators? Why cant it be AC?
- 35 Answers
- 69745 Views
- ABB, Ace Info, Alstom, Shalivahana Power, I also Faced
- E-Mail Answers
Answer Posted / b.t.ramakrishna rao
a current carrying conductor placed in a magnetic filed experiences a force
if d.c excitation is provided a constant magnetic field is produced hence the rotor conductors can experience a force.
where as if a.c excitation is given an alternating magnetic field is produced which results zero net magnetic filed,hence the rotor conductors fials to experience a force
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
Why do we require transformer with less specific weight if supply frequency is increased?
What is core CT & it's function?
If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB? Explain in detail.
Why use in ht motore
when will be the iocl interview results i faced interview on 8th september 2008 iam from electrical branch i faced interview for the post of electrical engineer??????????????????????//
How to Calculate Current Rating of SDFU (Switch Disconnector Fuse unit) for Protectionof Capacitor Bank connected to Busbar of 800Amp,in LV side of 11/0.433KV, 250KVA Transformer?
why h parameter are called as hybrid parameter?
whats the existence of reactive power and when it arises?
what is cathodic protaction?
2. What are the parameters of EHT sub-station?
How generator NPS(NEGATIVE PHASE SEQUENCE TEST)TEST WAS DONE? PROCEDURE WITH DETAILS?
difference between Ac and Dc mcb ????
How to test lightning Arrester?
How we calculate the current carrying capacity of H.T. cabel?
Explain the iniluencc of short circuit ratio on the pert'orniancc of synchronous machine.
