Recent content by smruti

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can a dc generator be converted into an alternator?

in traction applications which motor is best suitable? previoulsy dc series motors were used in traction applications due to there excellent starting torque.but now a days it is being replaced by induction motors.why can't we employ synchronous machine in traction application?

suppose i take the case of inverters/choppers/rectifiers, MOSFET,SCRs Diodes are used as switches.we only control the switch on and off state of these devices to get our desired output.it means all these devices are used only as switches in power electronics circuits?

Why only semiconductor devices in Power electronic circuits will operate as switches?

Now a days in most of the power systems(generation,transmission (HVDC, HVAC) and distribution) we use semiconductor devices for efficient use of power.using power electronic components in power systems does it affect the stability(transient/steady state)?

If you are given a pure sinusoidal wave and a perfect DC is required from it. then what is the best way to get it? should we go for full bridge rectifiers? or any better way is there?

in the calculation of complex power S=VI we sometimes use S=VI* and sometimes as S=V*I.what is the physical significance of these two notations and in which case these two expression has different meaning?

thank you..:)

but the primary winding is supplied with dc...how it will work on dc??

we know that when we give dc supply to a transformer then transformer action doesn't takes place and the primary winding of a transformer gets burnt even when small dc is injected..but how the transformer used in flyback converter works in dc?? what about its construction?

what is the difference between the construction of a power transformer and a pulse transformer used in high frequency application and what about their core and copper losses?

synchronous machine can run at synchronous speed but why can't induction machine run at synchronous speed?

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how it will cause phase difference when the speed will be same? can you please elaborate?