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  • Question
  • What is the angular difference between +j4 and ?j4?


  • Options
  • A. 30°
  • B. 90°
  • C. 180°
  • D. 270°

  • Correct Answer
  • 180° 


  • RC Circuits problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 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. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. A positive angle of 30° is equivalent to a negative angle of

    • Options
    • A. ?30°
    • B. ?330°
    • C. ?60°
    • D. ?180°
    • Discuss
    • 10. 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


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