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RL Circuits

RL Circuits
Referring to Problem 23, the reactive power is

6.76 mVAR
10 mVAR
148 mVAR
100 mVAR

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

0.8
1
0.2
0.4

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

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RL Circuits
To increase the current in a series RL circuit, the frequency

should be decreased
should be constant
cannot be determined without values
should be increased

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

halves
cannot be determined without values
remains constant
doubles

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

increases
decreases
cannot be determined
is not affected

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