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  • Question

  • If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is


  • Options
  • A. 50 mA
  • B. 70 mA
  • C. 120 mA
  • D. 40 mA

  • Correct Answer
  • 70 mA 

    • More questions

    • 1. 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
      • Discuss
    • 2. For the given circuit, find VTH for the circuit external to RL.


    • Options
    • A. 4.69∠51.3° V
    • B. 4.69∠38.7° V
    • C. 469∠38.7° mV
    • D. 6∠0° V
      • Discuss
    • 3. The two basic components of a Thevenin equivalent ac circuit are

    • Options
    • A. the equivalent voltage source and the equivalent series impedance
    • B. the equivalent voltage source and the equivalent series resistance
    • C. the equivalent voltage source and the equivalent parallel impedance
    • D. the equivalent voltage source and the equivalent parallel resistance
      • Discuss
    • 4. Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?


    • Options
    • A. 226 mW
    • B. 2.26 mW
    • C. 4.24 mW
    • D. 424 mW
      • Discuss
    • 5. Determine VTH if R1 is changed to 3.3 kΩ.


    • Options
    • A. 0.574∠16.7° V
    • B. 4.63∠16.7° V
    • C. 4.63∠39.5° V
    • D. 0.463∠39.5° V
      • Discuss
    • 6. Referring to the given circuit, find ZTH if R is 15 kΩ and RL is 38 kΩ.


    • Options
    • A. 89.82 ∠?51.3° kΩ
    • B. 19.2 ∠?38.3° kΩ
    • C. 9.38∠?51.3° kΩ
    • D. 180 ∠?38.3° kΩ
      • Discuss
    • 7. Referring to the given circuit, what is ZTH if R1 is changed to 220 Ω?


    • Options
    • A. 225∠12.1° Ω
    • B. 225∠77.9° Ω
    • C. 46∠77.9° Ω
    • D. 46∠12.1° Ω
      • Discuss
    • 8. What is the highest frequency contained in a pulse that has a rise and fall time equal to 10 microseconds (10 µs)?

    • Options
    • A. 35 kHz
    • B. 3.5 kHz
    • C. 10 kHz
    • D. 100 kHz
      • Discuss
    • 9. For a given wirewound core, an increase in current through the coil

    • Options
    • A. reverses the flux lines
    • B. decreases the flux density
    • C. increases the flux density
    • D. causes no change in flux density
      • Discuss
    • 10. In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is

    • Options
    • A. 6 A
    • B. 424 mA
    • C. 4.24 A
    • D. 42.4 A
      • Discuss

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