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Home ‣ Electronics ‣ Alternating Current vs Direct Current See What Others Are Saying!
  • Question

  • Power companies supply ac, not dc, because:


  • Options
  • A. it is easier to transmit ac
  • B. there is no longer a need for dc
  • C. dc is more dangerous
  • D. there are not enough batteries

  • Correct Answer
  • it is easier to transmit ac 

    • More questions

    • 1. What is the percent of regulation if Vnl = 20 V and Vfl = 19.8 V?

    • Options
    • A. 0%
    • B. 1%
    • C. .1%
    • D. 5%
      • Discuss
    • 2. The impedance is 1177 Ω.


    • Options
    • A. True
    • B. False
      • Discuss
    • 3. What is the total inductance, assuming no mutual inductance?


    • Options
    • A. 12 mH
    • B. 6 mH
    • C. 0.73 mH
    • D. 0 mH
      • Discuss
    • 4. A voltage is induced in a transformer secondary winding by the action of the:

    • Options
    • A. secondary magnetic field
    • B. primary turns ratio
    • C. primary magnetic field
    • D. secondary counter emf
      • Discuss
    • 5. Current will cause a magnetic field in a conductor as follows:

    • Options
    • A. An ac current causes a fixed polarity magnetic field.
    • B. A dc current causes a fixed polarity magnetic field.
    • C. A dc current causes an alternating magnetic field.
    • D. An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
      • Discuss
    • 6. If you wanted to decrease the inductance of a coil, you might increase the:

    • Options
    • A. number of turns
    • B. permeability of the core
    • C. spacing between turns
    • D. area of the coil
      • Discuss
    • 7. A 24 V peak source is connected across a 900 µH inductor. If the frequency of the source is 22 kHz, what is the reactive power?

    • Options
    • A. 2.3 VAR
    • B. 4.6 VAR
    • C. 9.3 VAR
    • D. 0 VAR
      • Discuss
    • 8. An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like

    • Options
    • A. a short
    • B. an open
    • C. a resistor
    • D. a voltage source
      • Discuss
    • 9. A henry value divided by a circuit resistive value provides the:

    • Options
    • A. counter emf value
    • B. induced voltage amplitude
    • C. rise or decay time constant
    • D. quality factor of the coil
      • Discuss
    • 10. You could decrease the time constant of an RL circuit by

    • Options
    • A. adding a resistor in parallel with the circuit resistance
    • B. adding an inductor in series with the circuit inductance
    • C. decreasing the amplitude of the input voltage
    • D. exchanging the position of the resistor and inductor in the circuit
      • Discuss

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