Answer / coolsunil56

dc excitation is given to rotor so that it gets magnetised and gets locked with magnetic revolving field of statorand start rotating with same speed means at synchronous speed.

Answer / k.sri405

dc can produced flux but it is constant in nature so magnet
have constant pole. that's why this pole gets locked with
the poles of stator

Answer / kundanmalani1990

Excitaion r use to the pole r converte to the parmanet magnet so the excitation r use

Answer / naveen

D.C Supply in alternater  used for genarating magnatic field in roter ,But nature of field would be Stationary Not fluctuating, when Roter get speed from prime mover  its Induced VOLTAGE AND CURRENT in Armature. 

Answer / vamsi

ac alternator is not a salf stator so dc supply for self
motor,dc can not produce flux.

how to change the load sharing between two synchronized identical alternators when both are running with Diesel engine? assume both are feeding to same feeder?

1 Answers   BARC,

how to calculate efficiency of voltage and current controlled welding transformer?

1 Answers  

why we generate 11kv power supply in generating station?

1 Answers   DBG, NTPC,

What is the meaning of dedicated earthing?

0 Answers   Dabur,

What is the dc grounding system and what is diff between AC/DC grounding system?

0 Answers  

Why we use Fuse in transformer in secondary side.Why we dont use fuse in primary side?

1 Answers   Care,

what are the units of cable insulation?

3 Answers  

Witch do depand of Power factor and theory of power factor?

0 Answers  

What is surge impedence and surge loading....???

1 Answers  

why effective resistance should be more than static resistance in transmission line?

0 Answers  

WHAT IS ELECTRICAL MAINTAINTENCE ?

0 Answers  

if we put a energy meter in 500 kvar capacitor bank ,then how much units show in energy meter per day.

2 Answers