Interested to Buy Any Domain ? << Click Here >> for more details...
if dc excitation is used to produce manetic flux in rotating
machines then ehy it is not used in transformers.
- 4 Answers
- 7843 Views
- I also Faced
- E-Mail Answers
Answer Posted / dileep
actually emf s are two types 1).statically induced emf 2).dynamically induced emf .we r giving dc suply while we are genarating dynamically induced emf's because emf is induced in the conductors wen there is some relative motion between conductor & field .if we r giving ac supply to rotating machines relative motion is zero that s why we r giving dc supply to rotating ma chines & this emf is due to self inductance .. but in case of transformers emf is due to mutual inductance
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
What is the range of the stator resistance of 3 phase induction motor?
give me a clear defination of inductance,and how can u calculate inductance of a motor
Why does increasing the magnetic flux in the main field of a d.c motor cause the armature current to reduce??
State any two nuclear power stations in India, with their generating capacity.
what is the internal working of star delta starter
How is efficiency of DG set calculated? At many places I found the efficiency to be mentioned in percentage. But at some other places I found kWH/ litres. I want to know how dimensionless percentage value is arrived at?
234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,
what is Fault level? why it is calculated? how will u decide same for our plant?
Write a note on materials used as a fuse element.
WE know that for Inductor X=2pifL,In DC f=0,then X=0 so,V=IX=0;But In the DC excitation of rotor of AC generator,DC motor field coil which coils are inductor so why does not applying DC voltage short the rotor coil of AC generator and field coil of motor?If it would then DC source might be damaged but it is not happened. Why does the strand conductor of Electrical power transmission line make twist?
i m in need of current rating chart of heavy duty pvc/xlpe, cu/al cables. can somebody provide me? if yes, plz send me at ashish_patel111@yahoo.com
Difference between on line capacitor and Station type capacitor
Which type of air compressor is used now a days in the market. Keeping in mind of energy efficiency and maintenance points. Relevant documents may also be sent on mentioned email ids.
what is the voltage between earth to neutral in lift.
main difference between ac and dc?
