InterviewSolution
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InterviewSolution
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When `1A` is passed through three coils `A,B,C` in series the voltage drops are respectively 6,3 and 8 volt on direct current source and 7,5 and 10 volt on Alternating current source Power factor of whole circuit when atlernating current flowA. 0.6B. 0.8C. 0.78D. 1 |
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Answer» Correct Answer - C `R_(A) = 6, R_(B ) = 3, R_(C ) = 8` `Z_(A) = 7, Z_(B) = 5, Z_(C ) = 10` `R` (total) `= 6 + 3 + 8 = 17 Omega` `X_(A) = sqrt(7^(2) - 6^(2)) = 3.6 Omega` `X_(B) = 4 Omega , X_(C ) = 6 Omega` X (total) `= 3.6 + 4 + 6 = 13.6 Omega` Total impedance `= sqrt(R^(2) + X^(2)) = 21.8 m` Power factor `= (R )/(Z) = (17)/(21.8) = 0.78` |
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