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RL Circuits

RL Circuits
Referring to Problem 23, the reactive power is

10 mVAR
6.76 mVAR
148 mVAR
100 mVAR

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RL Circuits
A 47Ω resistor is in series with an inductive reactance of 120Ω across an ac source. The impedance, expressed in polar form, is

129 angle 68.6°
47 angle 68.6°
129 angle 31.4°
120 angle 68.6°

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RL Circuits
In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is

26.0 V
20 V
18.4 V
2 V

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RL Circuits
If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit

doubles
remains constant
halves
cannot be determined without values

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RL Circuits
When the frequency is decreased, the impedance of a parallel RL circuit

is not a factor
decreases
increases
remains constant

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RL Circuits
To increase the current in a series RL circuit, the frequency

should be constant
cannot be determined without values
should be decreased
should be increased

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