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RC Circuits problems

  • 1. In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

  • Options
  • A. 200 mA
  • B. 100 mA
  • C. 282 mA
  • D. 141 mA
    • Discuss
  • 2. A positive angle of 30° is equivalent to a negative angle of

  • Options
  • A. ?30°
  • B. ?330°
  • C. ?60°
  • D. ?180°
    • Discuss
  • 3. In the complex plane, the number 4 + j3 is located in the

  • Options
  • A. first quadrant
  • B. second quadrant
  • C. third quadrant
  • D. fourth quadrant
    • Discuss
  • 4. A 12 kΩ resistor is in series with a 0.02 µF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3∠0° mA, what is the source voltage expressed in polar form?

  • Options
  • A. 45.6 V
  • B. 411.3 V
  • C. 0.411 V
  • D. 4.11 V
    • Discuss
  • 5. Point +4 on the complex plane is

  • Options
  • A. 4 units above the origin on the j axis
  • B. 4 units below the origin on the j axis
  • C. 4 units right of the origin on the real axis
  • D. 4 units left of the origin on the real axis
    • Discuss
  • 6. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

  • Options
  • A. R = XC
  • B. R > XC
  • C. R < XC
  • D. R = 5XC
    • Discuss
  • 7. A 2 kΩ resistor and a 0.002 µF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

  • Options
  • A. 84.5 mW
  • B. 845 mW
  • C. 13 mW
  • D. 130 mW
    • Discuss
  • 8. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

  • Options
  • A. increases
  • B. decreases
  • C. does not change
  • D. decreases to zero
    • Discuss
  • 9. A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is

  • Options
  • A. 212 Ω
  • B. 2.12 mS + j3.14 mS
  • C. 3.14 mS + j2.12 mS
  • D. 318.3 Ω
    • Discuss
  • 10. In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is

  • Options
  • A. 3 V
  • B. 27 V
  • C. 19.2 V
  • D. 1.9 V
    • Discuss

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