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Home ‣ Electrical Engineering ‣ RLC Circuits and Resonance See What Others Are Saying!
  • Question

  • A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is


  • Options
  • A. 12.7 Ω
  • B. 127 Ω
  • C. 4,436 Ω
  • D. 6,174 Ω

  • Correct Answer
  • 12.7 Ω 

    • More questions

    • 1. Three 15 mH inductors are in series. The total inductance is

    • Options
    • A. 15 mH
    • B. 30 mH
    • C. 45 mH
    • D. 5 mH
      • Discuss
    • 2. A parallel circuit acts as a current divider.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A capacitor blocks ac but passes dc.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Current is measured in

    • Options
    • A. watts
    • B. volts
    • C. henries
    • D. amperes
      • Discuss
    • 5. The number of kilowatts in 135 milliwatts is

    • Options
    • A. 1.35 × 10?4 kW
    • B. 135 × 10?3 kW
    • C. 0.0135 kW
    • D. 0.00135 kW
      • Discuss
    • 6. When the current through a 12 kΩ resistor is 8 mA, the power is

    • Options
    • A. 7.68 mW
    • B. 768 mW
    • C. 7.68 W
    • D. 76.8 W
      • Discuss
    • 7. In an RL circuit, part of the power is resistive and part is reactive.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The inductance of an iron-core coil decreases if

    • Options
    • A. the number of turns is decreased
    • B. the iron core is removed
    • C. the length of the coil decreases
    • D. none of the above
      • Discuss
    • 9. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 Ω. What is the approximate voltage across the load?

    • Options
    • A. 7.3 V
    • B. 73 V
    • C. 88 V
    • D. 880 V
      • Discuss
    • 10. A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is

    • Options
    • A. 48 µs
    • B. 480 µs
    • C. 2.42 µs
    • D. 24 µs
      • Discuss

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