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RL Circuits

RL Circuits
Which of the following power factors results in less energy loss in an RL circuit?

0.8
0.2
1
0.4

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RL Circuits
A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

1526Ω
152.6Ω
1200Ω
942Ω

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RL Circuits
Referring to Problem 23, the reactive power is

10 mVAR
100 mVAR
148 mVAR
6.76 mVAR

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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
564
0.564
6.76

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

doubles
halves
cannot be determined without values
remains constant

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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

200Ω
90Ω
5.51Ω
55.15Ω

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