Why is DC excitation used in a synchronous alternator instead of AC excitation?
Why is DC excitation used in a synchronous alternator instead of AC?
How power factor of alternator varies with excitation? What is frequency of AC signal generated by alternator? When started on no load, a salient pole synchronous motor pulls in synchronism even before dc excitation applied, why? Why doesn't direct current (DC) give an electric shock, while alternating current (AC) gives a shock? Why does the speed of a synchronous alternator decrease slightly on loading while that of a synchronous motor remain constant even as we load it? Why doesn't the DC current have frequency? Why do we need alternator synchronization in power system grid? Why does a capacitor oppose instantaneous changes in voltage? How does power factor of a synchronous machine changes with changing excitation? Why does an inductor have no effect on DC? Why DC systems don't involve reactive power? What systems use DC to DC high voltage gain? Operating principles of alternator? Is it true that in a DC motor, increasing Voltage increases RPM and increasing current increases torque? How does the commutator convert AC to DC in a DC generator? Why are there ripples in DC to DC converters? What are the advantages of separately excited DC motor? Why alternator output cannot contain even harmonics? Why the input current is independent of output biasing voltage? What's the mean of current move against voltage? What is the relation between RPM current and voltage in a DC motor? Why can't transformers transform DC current? The terminal rated voltage in alternator is phase voltage or line voltage? What are the applications of a separately excited DC motor? It's said that commutators in DC motors or generators convert AC into DC quantity and vice versa. How would it convert DC into AC? Does terminal voltage effect direction of rotation of dc motor? What will be the input and output dc voltage of inverter when we short input and output with a resistor? Does the transformer works with pulsated dc? Is DC voltage equivalent to the AC voltage? If yes, then how? Can pulsating DC be used in a transformer? If not then why?