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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
0.4
0.2
1

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RL Circuits
When the frequency of the voltage applied to a series RL circuit is increased, the phase angle

does not change
decreases
increases
cannot be determined without values

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RL Circuits
A 47Ω resistor is in series with an inductive reactance of 120Ω across an ac source. The impedance, expressed in polar form, is

129 angle 68.6°
47 angle 68.6°
129 angle 31.4°
120 angle 68.6°

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RL Circuits
Referring to Problem 23, the reactive power is

100 mVAR
148 mVAR
10 mVAR
6.76 mVAR

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

increases
cannot be determined without values
does not change
decreases

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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

not a factor
decreased
increased
doubled

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