Power in AC Circuits
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PHXII07:ALTERNATING CURRENT

356188 The power factor of an \(R - L\) circuit is \(1/\sqrt 2 \). If the frequency of \(AC\) is doubled, then what will be the power factor?

1 \(1 / \sqrt{3}\)
2 \(1 / \sqrt{5}\)
3 \(1 / \sqrt{7}\)
4 \(1 / \sqrt{11}\)
PHXII07:ALTERNATING CURRENT

356189 The power factor of \(R-L\) circuit is \(\frac{1}{{\sqrt 3 }}\). If the inductive reactance is \(2\Omega \). The value of resistance is

1 \(0.5\Omega \)
2 \(\frac{1}{{\sqrt 2 }}\Omega \)
3 \(2\Omega \)
4 \(\sqrt 2 \Omega \)
KCET - 2020
PHXII07:ALTERNATING CURRENT

356190 For the circuit shown in the figure the rms value of voltages across \(\mathrm{R}\) and coil are \(E_{1}\) and \(E_{2}\), respectively.
The power (thermal) developed across the coil is
supporting img

1 \(\dfrac{E-E_{1}^{2}-E_{2}^{2}}{2 R}\)
2 \(\dfrac{E^{2}}{2 R}\)
3 \(\dfrac{E-E_{1}^{2}}{2 R}\)
4 \(\dfrac{\left(E-E_{1}\right)^{2}}{2 R}\)
PHXII07:ALTERNATING CURRENT

356191 In an \(AC\) circuit with voltage \(V\) and current \(I\), the power dissipated is

1 Depends on the phase between \(V\) and \(I\)
2 \(\frac{1}{2}VI\)
3 \(\frac{1}{{\sqrt 2 }}VI\)
4 \(VI\)
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PHXII07:ALTERNATING CURRENT

356188 The power factor of an \(R - L\) circuit is \(1/\sqrt 2 \). If the frequency of \(AC\) is doubled, then what will be the power factor?

1 \(1 / \sqrt{3}\)
2 \(1 / \sqrt{5}\)
3 \(1 / \sqrt{7}\)
4 \(1 / \sqrt{11}\)
PHXII07:ALTERNATING CURRENT

356189 The power factor of \(R-L\) circuit is \(\frac{1}{{\sqrt 3 }}\). If the inductive reactance is \(2\Omega \). The value of resistance is

1 \(0.5\Omega \)
2 \(\frac{1}{{\sqrt 2 }}\Omega \)
3 \(2\Omega \)
4 \(\sqrt 2 \Omega \)
KCET - 2020
PHXII07:ALTERNATING CURRENT

356190 For the circuit shown in the figure the rms value of voltages across \(\mathrm{R}\) and coil are \(E_{1}\) and \(E_{2}\), respectively.
The power (thermal) developed across the coil is
supporting img

1 \(\dfrac{E-E_{1}^{2}-E_{2}^{2}}{2 R}\)
2 \(\dfrac{E^{2}}{2 R}\)
3 \(\dfrac{E-E_{1}^{2}}{2 R}\)
4 \(\dfrac{\left(E-E_{1}\right)^{2}}{2 R}\)
PHXII07:ALTERNATING CURRENT

356191 In an \(AC\) circuit with voltage \(V\) and current \(I\), the power dissipated is

1 Depends on the phase between \(V\) and \(I\)
2 \(\frac{1}{2}VI\)
3 \(\frac{1}{{\sqrt 2 }}VI\)
4 \(VI\)
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PHXII07:ALTERNATING CURRENT

356188 The power factor of an \(R - L\) circuit is \(1/\sqrt 2 \). If the frequency of \(AC\) is doubled, then what will be the power factor?

1 \(1 / \sqrt{3}\)
2 \(1 / \sqrt{5}\)
3 \(1 / \sqrt{7}\)
4 \(1 / \sqrt{11}\)
PHXII07:ALTERNATING CURRENT

356189 The power factor of \(R-L\) circuit is \(\frac{1}{{\sqrt 3 }}\). If the inductive reactance is \(2\Omega \). The value of resistance is

1 \(0.5\Omega \)
2 \(\frac{1}{{\sqrt 2 }}\Omega \)
3 \(2\Omega \)
4 \(\sqrt 2 \Omega \)
KCET - 2020
PHXII07:ALTERNATING CURRENT

356190 For the circuit shown in the figure the rms value of voltages across \(\mathrm{R}\) and coil are \(E_{1}\) and \(E_{2}\), respectively.
The power (thermal) developed across the coil is
supporting img

1 \(\dfrac{E-E_{1}^{2}-E_{2}^{2}}{2 R}\)
2 \(\dfrac{E^{2}}{2 R}\)
3 \(\dfrac{E-E_{1}^{2}}{2 R}\)
4 \(\dfrac{\left(E-E_{1}\right)^{2}}{2 R}\)
PHXII07:ALTERNATING CURRENT

356191 In an \(AC\) circuit with voltage \(V\) and current \(I\), the power dissipated is

1 Depends on the phase between \(V\) and \(I\)
2 \(\frac{1}{2}VI\)
3 \(\frac{1}{{\sqrt 2 }}VI\)
4 \(VI\)
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PHXII07:ALTERNATING CURRENT

356188 The power factor of an \(R - L\) circuit is \(1/\sqrt 2 \). If the frequency of \(AC\) is doubled, then what will be the power factor?

1 \(1 / \sqrt{3}\)
2 \(1 / \sqrt{5}\)
3 \(1 / \sqrt{7}\)
4 \(1 / \sqrt{11}\)
PHXII07:ALTERNATING CURRENT

356189 The power factor of \(R-L\) circuit is \(\frac{1}{{\sqrt 3 }}\). If the inductive reactance is \(2\Omega \). The value of resistance is

1 \(0.5\Omega \)
2 \(\frac{1}{{\sqrt 2 }}\Omega \)
3 \(2\Omega \)
4 \(\sqrt 2 \Omega \)
KCET - 2020
PHXII07:ALTERNATING CURRENT

356190 For the circuit shown in the figure the rms value of voltages across \(\mathrm{R}\) and coil are \(E_{1}\) and \(E_{2}\), respectively.
The power (thermal) developed across the coil is
supporting img

1 \(\dfrac{E-E_{1}^{2}-E_{2}^{2}}{2 R}\)
2 \(\dfrac{E^{2}}{2 R}\)
3 \(\dfrac{E-E_{1}^{2}}{2 R}\)
4 \(\dfrac{\left(E-E_{1}\right)^{2}}{2 R}\)
PHXII07:ALTERNATING CURRENT

356191 In an \(AC\) circuit with voltage \(V\) and current \(I\), the power dissipated is

1 Depends on the phase between \(V\) and \(I\)
2 \(\frac{1}{2}VI\)
3 \(\frac{1}{{\sqrt 2 }}VI\)
4 \(VI\)