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.

why dc supply given to ac alternator rotor

3 Answers  

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Alternators are invariably star connected why?

4 Answers  

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what are the types of 3-ph. generator protection

2 Answers  

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what is the difference in operation of 3 phase motor when am forward delta connection and reverse delta connection?

1 Answers   Birla,

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What should be the value of earth resistance for an instrumentation/electronic circuit? As per which IS/IEC Code?

3 Answers   IOCL,

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how we can come to know that motor winding resistance which showing by DMM is right or wrong???is there any chart or something that we will compare & check???

0 Answers  

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what is difference between earth fault& restricted earth fault.

3 Answers  

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Unit of Magnetic Flux Density a) Tesla b) weber c) Hendry d) Farad

3 Answers   Ecil,

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what is meant by MCB and MCCB? and what its full form?

7 Answers   Bajaj, JHM Hotels,

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how system fault level is calculated?

1 Answers   HCL,

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In Indian Railways , how the AC motor is driven? Please explain clearly starting from the overhead 25kV supply.

1 Answers  

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What are electric motors?

0 Answers  

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