Interested to Buy Any Domain ? << Click Here >> for more details...
Why dc voltage used to excite alternator field in stead of ac?
- 4 Answers
- 8150 Views
- I also Faced
- E-Mail Answers
Answer Posted / kj
When a wire is moved through a magnetic field it produces a
voltage across the wire. To produce an ac output the wire
must move past a north pole and then a south pole in
continuing sequence.
A dc voltage on the field will maintain the poles with the
same polarity. An ac voltage will cause the polarity to
reverse 100 times a second (50Hz) and this will not be
usable for generating the ac output voltage.
Usually an ac voltage is used but it is rectified either as
half wave or full wave before being put into the field.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
Why 15Amp. MCB is suitable to carry load of 1.5Ton Ac please Explain?
what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?
State thevenin’s theorem?
Why reactive power is needed in a power system? How is it being absorbed or delivered by alternators? For reactive power control we are changing excitation but reactive power absorbing or delivering related to stator. How these two are interlinked? i want a detailed explanation with necessary expressions and figures?
How to do maintenance of transformer feeder.
Which capacitor is preferred for high voltage and frequency?
how a resistor resists to flow the current?how an inductor oppses the sudden change in current?how a capacitor opposes a DC voltage.
In case of HV test on medium voltage cables, BS is asking for 4 U0 where as IEC is asking for 3.5 U0. Can any one advise me how this 3.5 times or 4 times U0 is derived?
Match the following a)(X'+Y') b)X'Y' C)XY 1)NAND 2)NOR 3)Carry
What are test values for an 63 KVA and 100 Kva Distribution Transformers for the following typical tests 1)Magnetic balance 2)Short circuit test 3)Open Circuit test 4)Vector group confirmation test .please give me the standard values for all the above tests.
I want formula to calculate cable size as per load given in length & amp. I searched many sites but didn't right answer. Please reply me asap.
what is the advantages og idmt relay over magnetic relay??
What are safety device in vcb and acb?
why swityard is necessrry requirement in any bis power distributin systems?
HOW DOES THE ELECTRONIC ENERGY METER WORKS?
