Answer / abdul hameed

first we need DC current in the rotor second we need AVR this device controlled the the voltage which feeding the rotor.this
method is suitably for brush and brush less generator

Answer / vinod

EXTERNAL DC SOURCE

Answer / siddhu

In an alternator the rotor acts as a field winding it produces rotating flux when excited with dc current by an external dc source when this flux cuts the armature, current is induced in it.

what is meant by differential protection of transformer

1 Answers  

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Why Indian Electricity frequency desined 50 Cycles as developed countrys are using high frequency with low voltage

1 Answers  

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How to calculate Earth busbar size & what is the procedure we make for determine that?

1 Answers  

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wich type of cable is selected for wiring of 20hp motor?

5 Answers   Alchemist,

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what is the diff.between neutral and earth?

4 Answers  

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STATE WORKING OF VACCUM CIRCUIT BRAKER?

0 Answers   ABB, BEML,

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explain why the armature voltage changes when the field rheostat is varied in self excited DC generator

2 Answers  

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why capacitance effect is predominant in underground cable transmission and inductance effect is predominant in over head line transmission?

0 Answers  

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what is impedence voltage

1 Answers   Thermax,

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Which of the following loss varies with the load A hystresis loss B eddy current loss C copper loss D core loss

1 Answers  

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I have 1500KVA transformer ,How much Maximum KW Load is allowed?

15 Answers   GKC Projects Limited GKCPL,

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explain why tap changer is always connected to high voltage winding side of the transformer.

10 Answers   IOCL, UPPCL,

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