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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

12 VA
6 VA
24 VA
0 VA

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

doubles
cannot be determined without values
halves
remains constant

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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
3.84 angle 20.6° V
0.3 angle 20.6° V
12.8 angle 20.6° V

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

increases
decreases
cannot be determined without values
does not change

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

remains constant
is not a factor
increases
decreases

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

cannot be determined
is not affected
increases
decreases

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