# RLC Circuits – Exercise – 1

RLC Circuits » Exercise – 1

1. A 10 Ω resistor, a 90 mH coil, and a 0.015 μF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is ________.

(a) 1,616 Ω
(b) 161 Ω
(c) 3,387 Ω
(d) 1,771 Ω

Explanation
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2. A 12 Ω resistor, a 40 μF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is ________.

(a) 28.1 Hz
(b) 281 Hz
(c) 2,810 Hz
(d) 10 kHz

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3. A 15 Ω resistor, a 220 μH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

(a) 138 MHz
(b) 10,866 Hz
(c) 1,907 Hz
(d) 138 kHz

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4. In a series RLC circuit that is operating above the resonant frequency, the current ________.

(a) lags the applied voltage
(c) is in phase with the applied voltage
(d) is zero

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5. A resistor of 3 kΩ, a 0.05 μF capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?

(a) 636 Ω
(b) 3,769 Ω
(c) 433 Ω
(d) 4,337 Ω

Explanation
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