engineering recuitment RVUNL JEn (RSEB) Mock Tests 2025 Electrical and Electronics Measurements Measurement of Power Measurement of AC Power
Measurement of power factor for balanced load by two wattmeters for lagging power factor is:
1
\(\tan \phi = \sqrt 3 \left( {\frac{{{W_1} + {W_2}}}{{{W_1} - {W_2}}}} \right)\)
2
\(\tan \phi = - \sqrt 3 \left( {\frac{{{W_1} - {W_2}}}{{{W_1} + {W_2}}}} \right)\)
3
\(\tan \phi = \sqrt 3 \left( {\frac{{{W_1} - {W_2}}}{{{W_1} + {W_2}}}} \right)\)
4
\(\tan \phi = - \sqrt 3 \left( {\frac{{{W_1} + {W_2}}}{{{W_1} - {W_2}}}} \right)\)
5
None of the above