Answer / p.k.ghosh

We know that for an A/c circuit Kw=Kva*P.f & the load power
factor is unknown to the manufacturer.So the rating of the
alternator is mention by Kva. Now for D.c circuit p.f=1 ,
Hence generator(D.C) is rated as Kv*A*1=Kw.

Answer / srivalli

Losses in an alternator are dependent of load power factor so it is rated as KW instead of KVA

. The string effcy in AC sys is 80% Then for same power, the string effcy in dc sys is a) less than 80% b) 80% c) more than 80% d) zero

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Hi all, please could anybody give me a suggestion about Electrical designs and calculations .. what text book should i follow as i am a trainee engineer and here work going not so favorable to me so please help me friends .. A small discription about my work which is going here is all about Electrical designs like cable sizing, lighting, lightning, Gensets sizing, motor sizing, transformer sizing, generator sizing, circuit breakers, PDB MCC PCC SLDB MLDB panels, Single line diagrams mainly, substation desings, cable routing and layouts, reactive power compensations, power factor improvement, voltage drop calculations, power generations, power transmission, power distributions all calculations i need .. please please if anybody experienced with this problem and got a solution then please help me .. just i need an apt text book for these all calculations and designs ..

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To avoid arcing what we connect in earthing.

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