Interested to Buy Any Domain ? << Click Here >> for more details...
Why DC excitation is used for alternators? Why cant it be AC?
- 35 Answers
- 78137 Views
- ABB, Ace Info, Alstom, Shalivahana Power, I also Faced
- E-Mail Answers
Answer Posted / shyamalmandirwala
Actually the answer is like this:
When we are giving DC excitation to the AC machine,we are
imposing DC on AC.
In this case the Resulting Frequency (Fr) will be the
difference of the two.
Hence in this case,Fr = 50 - 0 = 50Hz
and hence we get the excitation at desired frequency,where
as if we provide AC excitation, then Fr will become 0Hz &
so no excitating magnetic field will be created...
| Is This Answer Correct ? | 8 Yes | 11 No |
Post New Answer View All Answers
What is the Good Earth resistance value of G.I & Cu. Chemical Earthing & Normal Pipe Earthing?
Can i replace Earth leakage relay to the faulty Earth Faulty Relay
What is an ac motor?
Why a Permanent Magnet Generator has higher frequency as compared to frequency of main alternator?
What is principle of Floroscent tube 36watt.
Write the force balance equation of ideal dashpot element.
What is the restart inhabit setting in ABB spam150c relay (Motor protection relay)
what happen when increase or decrease size of lamp,light.glass.
What it the purpose of parallel phasing transfomers??
how can i find ct ratio of meter by seeing name plate of meter and how it should be used in MF calculation if it shows only-/1???
63MVA,220KV/6.9KV Transformer LV side neutral is connected to Earth pit through NGR. Whether this earth pit required to connect with near by below grouding earth mat or it is to be kept separate?
In Indian Household, generally we receive 220V AC single phase supply. But AC has 2 phases, +ve & -ve. So in +ve half cycle current is flowing...so what happens in the -ve half cycle?? Please illustrate.
i have interview in Pepsi company what type of question will ask please send the question and answeer
In hydel power plants, L.A's, S.C's are placed inside the control panel boards. what is the purpose? [already the total body was earthed to ground.]
what is mean by transition resistance of transformer?
