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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
When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle

is not affected
increases
decreases
cannot be determined

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RL Circuits
A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 angle 0° mA. The source voltage, expressed in polar form, is

13.84 angle 69.4° V
0.3 angle 20.6° V
12.8 angle 20.6° V
3.84 angle 20.6° V

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RL Circuits
A 140Ω resistor is in parallel with an inductor having 60 inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is

55.15Ω
5.51Ω
90Ω
200Ω

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

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RL Circuits
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance

does not change
cannot be determined without values
decreases
increases

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