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It has been determined that the source of audible noise for a radio is due to the power supply voltage. How can an inductor be configured to eliminate this noise?


A) An inductor will not affect the noise.
B) Connect the inductor in series with the radio power wire.
C) Connect the inductor in parallel with the radio.
D) both B and C

E) None of the above
F) All of the above

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If a 25 mH inductor drops 50 V while operating at 400 Hz, what is XL?


A) 6.28 kΩ
B) 62.8 kΩ
C) 628 Ω
D) 62.8 Ω

E) A) and B)
F) C) and D)

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In an inductive AC circuit, the phase relationship between the voltage and the current is such that the:


A) voltage is lagging the current.
B) voltage is 360 degrees out of phase with voltage.
C) current is 180 degrees out of phase with voltage.
D) current is lagging the voltage.

E) B) and C)
F) None of the above

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Inductors in series or parallel combine just like resistors in series or parallel.

A) True
B) False

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When a DC voltage is first applied to an inductor, the initial circuit current is zero.

A) True
B) False

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What is the time constant for a 50 mH inductor and 5 kΩ resistor connected in series?


A) 10 µs
B) 250 s
C) 100 s
D) 10 ms

E) C) and D)
F) A) and B)

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