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

  • Why is ac current transfer more effective than dc current transfer over long distances?


  • Options
  • A. due to the height of power lines
  • B. due to the use of ac generators
  • C. due to step-up and step-down transformers reducing I2R losses
  • D. due to very high voltages

  • Correct Answer
  • due to step-up and step-down transformers reducing I2R losses 

    • More questions

    • 1. 64 hexadecimal equals 100 decimal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The negative and positive charge symbols are assigned (in that order) to the:

    • Options
    • A. proton and electron
    • B. electron and proton
    • C. atom and nucleus
    • D. electron and element
      • Discuss
    • 3. Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.

    • Options
    • A. does not change
    • B. doubles for every 1 kHz increase in frequency
    • C. increases
    • D. decreases
      • Discuss
    • 4. 

      The total power in the given circuit is ___.


    • Options
    • A. 4.8 mW
    • B. 18 mW
    • C. 7.2 mW
    • D. 30 mW
      • Discuss
    • 5. Inductance is proportional to the cross-sectional area of a coil.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. End around carry is an operation in 1's complement subtraction where a 1 is added to the sum of the 1's complement of both numbers.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A circuit that uses an amplifier with passive filter elements is called a(n):

    • Options
    • A. relaxation oscillator
    • B. signal generator
    • C. differential amplifier
    • D. active filter
      • Discuss
    • 8. A wire with a smaller cross-sectional area will produce:

    • Options
    • A. less heat
    • B. more conductance
    • C. less resistance
    • D. more heat
      • Discuss
    • 9. A TRIAC will control AC voltage during the positive half cycle only.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. As frequency increases

    • Options
    • A. both series and parallel RC impedance decrease
    • B. series RC impedance decreases and parallel RC impedance increases
    • C. series RC impedance increases and parallel RC impedance decreases
    • D. both series and parallel RC impedance increase
      • Discuss

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