Answer / bala

carbon is a NTC(negative temp coefficient)material. its
resistance decrease while temp gets rise. also carbon gives
wear for give smooth rotation without friction. so its used to
give smooth rotation and less resistance in electricity..!

In an ACB shunt trip coil and undervoltage coil operated normally( breaker open and charged). But closing coil not operating untill manually discharge and recharging. Any help.

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what is dc transformer? how it work?

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what is the speed of the darkness?

3 Answers   Wipro,

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