Question { L&T, 146433 }

what is name of transformer oil ?

Answer

Chemical name of Transformer oil is Hydrotreated Light Nepthanic Distillate

Question { 4615 }

STATE WORKING OF SF6 C.B.?

Answer

In case of SF6 CB SF6gas is used as arc quenching medium in.
when CB trip the male-female contact (we can say fix and
moving contact otherwise) gets opened at the same time SF6 gas
at particular pressure enters between the contacts and quench
the arc, also act as a coolant and insulating medium.

Question { HP, 51107 }

what is voltage rise and voltage drop?

Answer

Voltage rise: in case of transmission line suppose line is
charged on no load. Due to its capacitive effect( farrenty
effect) voltage gets rise at receiving end more than rated
voltage.

Voltage drop: due active power loss or resistance of the line
IR drop occurs which result in getting less voltage at
receiving end less than rated voltage another reason is if we
apply heavy load voltage drop occurs

Question { 6426 }

why we use negative feedback in control system.

Answer

In case of negative feedback system the gain we get is more
than one

Question { 4770 }

what is power transformer?

Answer

Transformer used at EHV or above level by transmission utility for transmitting of power from EHV level to HV level is called "power transformer". The transformer used between two different EHV level is called inter-connector transformer

Question { 4417 }

In case of dc circuit Whether dc current will pass through capacitor after it gets charged?

Answer

I think current will pass as leakage current practically as there is losses occurs in Capacitor