railway RRB JE (CBT I + CBT II) Mock Test 2024 Estimation and Costing Estimation Power System Equipment
According to Kelvin’s law, the most economical size of conductor is that for which variable part of annual charge is:
1
less to annual cost of energy wasted
2
equal to annual cost of energy wasted
3
\(\sqrt{2}\) times to annual cost of energy wasted
4
more to annual cost of energy wasted