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Home Electrical Engineering Inductors See What Others Are Saying!
  • Question
  • The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately


  • Options
  • A. 6.9 µH
  • B. 14 µH
  • C. 2.2 µH
  • D. 155 µH

  • Correct Answer
  • 6.9 µH 


  • More questions

    • 1. A phasor represents

    • Options
    • A. the magnitude and a quantity direction
    • B. the width of a quantity
    • C. the phase angle
    • D. the magnitude of a quantity
    • Discuss
    • 2. The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency

    • Options
    • A. must be increased
    • B. must be decreased
    • C. is held constant
    • D. has no effect
    • Discuss
    • 3. A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

    • Options
    • A. 5.14 MHz
    • B. 514 kHz
    • C. 5.03 MHz
    • D. 503 kHz
    • Discuss
    • 4. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is

    • Options
    • A. 1 A
    • B. 7 A
    • C. unknown
    • D. the larger of the two
    • Discuss
    • 5. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is

    • Options
    • A. 12.5 Ω
    • B. 200 Ω
    • C. 20 KΩ
    • D. 50 Ω
    • Discuss
    • 6. Eight-tenths coulomb passes a point in 4 s. The current in amperes is

    • Options
    • A. 1.6 A
    • B. 16 A
    • C. 2 A
    • D. 0.2 A
    • Discuss
    • 7. The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage

    • Options
    • A. decreases
    • B. increases
    • C. remains the same
    • D. becomes zero
    • Discuss
    • 8. The complex number 6 + j6 is equivalent to

    • Options
    • A. 6∠45°
    • B. 36∠45°
    • C. 8.48∠45°
    • D. 8.48∠90°
    • Discuss
    • 9. Generally, the mesh current method results in fewer equations than the node voltage method.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. 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
    • Discuss


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