Answer Posted / ann
For DC machine
when when we energize rotor of the machine .flux is produce this flux is static flux ... when the rotor of the dc machine rotors the flux cuts the stator winding according to Faraday's law a produced emf is produced which cancelled the effect of original emf .the emf is called back emf which oppose the effect of original emf
For ac machines,
both parts of machine are rotating .. when we energize the rotor of synchronous machine with dc supply a rotating emf is induce which cuts the winding of stator in the result back emf induce
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
what is the transformer turn ratio formula and give some examples?
any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?
what is subtransient , transient and steady stateac components
How to design harmonic filter at the project stage without nowing the harmonics levels
detailed procedure how we calculate cost for pcc m10 and rcc m20 including centering and labour excluding steel/ iron
why the pf of semiconductor device is improved the electrical devices
How to know th details about an electrical Drawing ? Please mention the easy method.
what is a types of short circuit and what is a types of distance protection tests
in my industry we are using 3 step up transformers for induction heaters..i.e 415/580v and other are 11/440v.in power consumption does a step trnsformer makes any difference compared to step up?? plz explain
what is the condition for YnD11
plz send me the placement interview question and answers of whizchip(technical and apttitude)..i have an interview in next.
What are the reasons for the parallel operation of transformers?
how power trnafor from 1 point to another point in bus bar ya transmission line( voltage trnasfer from 1 point to another poin)
What is warm / cold start of HT motors. How many warm start & cold start are possible in a day?
what are inductive and capacitive voltage transformers.what are their applications
