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RL Circuits

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

0.4
0.2
1
0.8

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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

decreased
increased
not a factor
doubled

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RL Circuits
Referring to Problem 23, the reactive power is

148 mVAR
10 mVAR
100 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

564
6.76
0.564
55.7

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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
halves
doubles
remains constant

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RL Circuits
A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is

8.74 A
874 A
8.74 mA
874 mA

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