railway RRB JE (CBT I + CBT II) Mock Test 2024 Power Systems Transmission and Distribution Power Factor Correction
When shunt capacitors are used for improving the power factor, _________ is the most economic power factor when kVA demand is constant.
1
\(\cos \left[\tan ^{-1}\left(\frac{\text { annual return per } \mathrm{kW} \text { of installation }}{\text { annual charges per kVAr of capacitors }}\right)\right]\)
2
\(\cos \left[\tan ^{-1}\left(\frac{\text { annual charges per kVAr of capacitors }}{\text { annual return per } \mathrm{kW} \text { of installation }}\right)\right] \)
3
\(\cos \left[\cot ^{-1}\left(\frac{\text { annual charges per kVAr of capacitors }}{\text { annual return per } \mathrm{kW} \text { of installation }}\right)\right] \)
4
\(\cos \left[\cot ^{-1}\left(\frac{\text { annual return per } \mathrm{kW} \text { of installation }}{\text { annual charges per kVAr of capacitors }}\right)\right] \)