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Home ‣ Electrical Engineering ‣ Alternating Current and Voltage See What Others Are Saying!
  • Question

  • Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?


  • Options
  • A. Wave A leads wave B by 15°.
  • B. Wave A lags wave B by 15°.
  • C. Wave A leads wave B by 105°.
  • D. Wave A lags wave B by 105°.

  • Correct Answer
  • Wave A leads wave B by 15°. 

    • More questions

    • 1. Generally, the mesh current method results in fewer equations than the node voltage method.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. 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
    • 3. If you know the current anywhere in a series circuit, you know the current everywhere in a series circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. A wiper is the sliding contact in a

    • Options
    • A. switch
    • B. photoconductive cell
    • C. thermistor
    • D. potentiometer
      • Discuss
    • 5. When an additional resistor is connected across an existing parallel circuit, the total resistance

    • Options
    • A. remains the same
    • B. decreases by the value of the added resistor
    • C. increases by the value of the added resistor
    • D. decreases
      • Discuss
    • 6. A lower Q produces a narrower bandwidth.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Voltage leads current by 90° in a capacitor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Voltage is measured in

    • Options
    • A. volts
    • B. farads
    • C. watts
    • D. ohms
      • Discuss
    • 9. A 0.01 µF capacitor equals how many picofarads?

    • Options
    • A. 100 pF
    • B. 1,000 pF
    • C. 10,000 pF
    • D. 100,000 pF
      • Discuss
    • 10. When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. becomes erratic
      • Discuss

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