In case of two wattmeter method of measurement of 3-phase power measurement of balanced load, the power factor angle is

\({\tan ^{ - 1}}\left( {\frac{{{w_1} - {w_2}}}{{{w_1} + {w_2}}}} \right)\)

\({\tan ^{ - 1}}\left( {\frac{{{w_1} + {w_2}}}{{{w_1} - {w_2}}}} \right)\)

\({\tan ^{ - 1}}\left( {\frac{{\sqrt 3 \left( {{w_1} - {w_2}} \right)}}{{{w_1} + {w_2}}}} \right)\)

\({\tan ^{ - 1}}\left( {\frac{{\sqrt 3 \left( {{w_1} + {w_2}} \right)}}{{{w_1} - {w_2}}}} \right)\)

In case of two wattmeter method of measurement of 3-phase power measur

1.	In case of two wattmeter method of measurement of 3-phase power measurement of balanced load, the power factor angle is
A.	\({\tan ^{ - 1}}\left( {\frac{{{w_1} + {w_2}}}{{{w_1} - {w_2}}}} \right)\)
B.	\({\tan ^{ - 1}}\left( {\frac{{\sqrt 3 \left( {{w_1} - {w_2}} \right)}}{{{w_1} + {w_2}}}} \right)\)
C.	\({\tan ^{ - 1}}\left( {\frac{{{w_1} - {w_2}}}{{{w_1} + {w_2}}}} \right)\)
D.	\({\tan ^{ - 1}}\left( {\frac{{\sqrt 3 \left( {{w_1} + {w_2}} \right)}}{{{w_1} - {w_2}}}} \right)\)
Answer» C. \({\tan ^{ - 1}}\left( {\frac{{{w_1} - {w_2}}}{{{w_1} + {w_2}}}} \right)\)

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In case of two wattmeter method of measurement of 3-phase power measurement of balanced load, the power factor angle is

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