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RL Circuits

RL Circuits
Referring to Problem 23, the reactive power is

10 mVAR
100 mVAR
6.76 mVAR
148 mVAR

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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

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

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

cannot be determined without values
remains constant
halves
doubles

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RL Circuits
The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is

not a factor
decreased
increased
doubled

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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

20 V
2 V
26.0 V
18.4 V

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RL Circuits
A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is

55.7
0.564
6.76
564

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