if dc motor can operate by ac supply ? if its possible means how ?

how DC is differ from AC ? what are the difference between them ?exept (P-N)&(+__-)

what is meant by skin effect ?

what is the function of switch gear ?

Exxaro,

Where we give genset o/p in home & industrial applications ?

what is the difference between core & shell type transformer ?& where we use those transformers ?

BNCET,

where we use 1 phase & 3 phase supply ?what is major advantage using 3 phase over than single phase ?

i need 24v dc from 230v ac supply how we can getit ? what are the devices &its rating requied for that ? plzz i need answer urgently .thank u

IF ANY MATERIAL AVAILABLE IN MARKET FOR MOTOR PROTECTION INSTEAD OF OLR & CONTACTOR ?

HOW WE CAN REDUCE THE CIRCUIT COMPLEX OF STAR-DELTA STARTER .BECAUSE NOW WE USING ONE TIMER RELAY & THREE CONTACTOR FOR MAIN,STAR & DELTA ?IF ANY IDEAS PLZ POST.THANK U

WHAT TYPE OF DC MOTOR IS USING FOR ELECTRIC TRAIN ?HOW ITS FUNCTIONING ?

Why power factor does not occur in DG set ?

what is meant by displacement & magnitude ?

what is use of thermistor ?

define frequency ?

KPTCL,