Question

The string efficiency of a string insulator with bottom unit having a 40% of the total voltage is 62.5%. The number of units in the string insulator is _____

• A. 4

Answer 1

The correct option is A 4

$\eta =\frac{voltageacrossthestring}{n\times voltageacrossthebottomunit}$

$\frac{62.5}{100}=\frac{V}{n\times \left(0.4V\right)}$

$n=4units$