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RL Circuits

RL Circuits
If a load is purely inductive and the reactive power is 12 VAR, the apparent power is

6 VA
24 VA
12 VA
0 VA

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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

90Ω
200Ω
5.51Ω
55.15Ω

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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

2 V
26.0 V
20 V
18.4 V

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

1
0.2
0.4
0.8

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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
cannot be determined
increases
decreases

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

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