railway RRB JE (CBT I + CBT II) Mock Test 2024 Power Systems Transmission and Distribution Overhead Insulators
If voltage across the string is denoted by 'a' the number of discs on the string is denoted by 'b' and the voltage across disc nearest to the conductor is depicted by 'c' then the string efficiency is given by
1
abc
2
a / b
3
a / (bc)
4
(ab) / c