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Home ‣ Electrical Engineering ‣ RL Circuits See What Others Are Saying!
  • Question

  • A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3∠0° mA. The source voltage, expressed in polar form, is


  • Options
  • A. 3.84∠20.6° V
  • B. 12.8∠20.6° V
  • C. 0.3∠20.6° V
  • D. 13.84∠69.4° V

  • Correct Answer
  • 3.84∠20.6° V 

    • More questions

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given.


    • Options
    • A. 562 mV, 167 Ω
    • B. 5.62 V, 167 Ω
    • C. 5.62 V, 188 Ω
    • D. 562 mV, 188 Ω
      • Discuss
    • 5. Referring to Problem 15, if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

    • Options
    • A. 6 V
    • B. 597 mV
    • C. 5.97 V
    • D. 0 V
      • Discuss
    • 6. The minimum resistance value for a blue, gray, red, silver resistor is

    • Options
    • A. 612 Ω
    • B. 6,120 Ω
    • C. 6,800 Ω
    • D. 6,460 Ω
      • Discuss
    • 7. Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers

    • Options
    • A. 18 W
    • B. 1.5 W
    • C. 48 W
    • D. 72 W
      • Discuss
    • 8. Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?


    • Options
    • A. 0.16 A
    • B. 0.24 A
    • C. 0.2 A
    • D. 0.04 A
      • Discuss
    • 9. The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

    • Options
    • A. 1,000 V
    • B. 2,000 V
    • C. 31.25 V
    • D. 3,125 V
      • Discuss
    • 10. 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

    • Options
    • A. 1,616 Ω
    • B. 161 Ω
    • C. 3,387 Ω
    • D. 1,771 Ω
      • Discuss

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