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RC Circuits problems

  • 1. A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is

  • Options
  • A. Z = 47 Ω + j150 Ω
  • B. Z = 47 Ω ? j150 Ω
  • C. Z = 197 Ω
  • D. Z = 103 Ω
    • Discuss
  • 2. In the complex plane, the number 14 ? j5 is located in the

  • Options
  • A. first quadrant
  • B. second quadrant
  • C. third quadrant
  • D. fourth quadrant
    • Discuss
  • 3. The complex number 40∠ 55° is equivalent to

  • Options
  • A. 55 + j55
  • B. 40 + j40
  • C. 45.88 + j65.52
  • D. 22.94 + j32.76
    • Discuss
  • 4. The complex number 6 + j6 is equivalent to

  • Options
  • A. 6∠45°
  • B. 36∠45°
  • C. 8.48∠45°
  • D. 8.48∠90°
    • Discuss
  • 5. A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?

  • Options
  • A. 129 Ω
  • B. 12.9 Ω
  • C. 167 Ω
  • D. 73 Ω
    • Discuss
  • 6. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is

  • Options
  • A. 19.52 W
  • B. 195.2 W
  • C. 275 W
  • D. 25 W
    • Discuss
  • 7. A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is

  • Options
  • A. 0 Hz
  • B. 12 kHz
  • C. 6 kHz
  • D. 18 kHz
    • Discuss
  • 8. What is the angular difference between +j4 and ?j4?

  • Options
  • A. 30°
  • B. 90°
  • C. 180°
  • D. 270°
    • Discuss
  • 9. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is

  • Options
  • A. 9.2 mA
  • B. 92 mA
  • C. 4.6 mA
  • D. 460 mA
    • Discuss
  • 10. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

  • Options
  • A. increases
  • B. decreases
  • C. remains the same
  • D. doubles
    • Discuss

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