Answer / abhay mishra

RRA stands for Rotating Rectifier Assembly.... which converts the AC into DC which is given to the field winding of synchronous generator i.e. alternator.

I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)

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why the transformer is not operates on two phase?

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The unit of electrical charge is the

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Are same transformer be employed for step up and step down services?

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why the field winding of synchronous machine is excited by dc source

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