Question { 2155 }

why we store only dc in batteries ?

Answer

Battery store energy which is produced by basically by chemical reaction. Due to chemical reaction positive and negative ions are liberated from electrodes are deposited using electrolyte. In some electrode looses electrons so becomes positively charged and other electrode gains electrons and hence becomes negatively charged. So it has fixed charge. So when external load is connected across the electrodes DC current will flow

Question { Pretech Plast, 1634 }

Whai isPCC and MCC Difference?

Answer

PCC is basically the power distribution board. Power distributed to various systems by using its outgoing feeders. Each individual feeders are protected by individual circuit breaker.

MCC is the panel used as starters for many constant speed application motor. So it is having starters circuits like DOL, RDOL, Star-Delta etc