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Home ‣ Electronics ‣ Alternating Current vs Direct Current Comments
  • Question

  • The phase difference between sine waves of different frequencies is:


  • Options
  • A. equal to their frequency differences
  • B. the difference in their fixed time displacement
  • C. the same throughout time
  • D. constantly changing

  • Correct Answer
  • the difference in their fixed time displacement 

    • Alternating Current vs Direct Current problems

    Search Results

    • 1. What are the two main applications for ac?

    • Options
    • A. direct, pulsating
    • B. electric, magnetic
    • C. power, information
    • D. static, dynamic
      • Discuss
    • 2. The current is flowing in what direction?


    • Options
    • A. clockwise
    • B. counterclockwise
    • C. in both directions at the same time
    • D. 50% of the time clockwise and 50% of the time counterclockwise
      • Discuss
    • 3. What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?

    • Options
    • A. 3 ms
    • B. 16 ms
    • C. 4 ms
    • D. 20 ms
      • Discuss
    • 4. A sine wave has:

    • Options
    • A. four quadrants
    • B. two alternations
    • C. one period
    • D. all of the above
      • Discuss
    • 5. Temperature sensing can be achieved by the use of

    • Options
    • A. thermocouples
    • B. RTDs
    • C. thermistors
    • D. All of the above
      • Discuss
    • 6. Test equipment selection enables the technician to both generate signals and:

    • Options
    • A. change circuit conditions
    • B. inject signals
    • C. sense circuit conditions
    • D. change signal frequencies
      • Discuss
    • 7. What is the rms voltage value of an ac signal whose peak oscilloscope display uses 3 major divisions above the zero setting? (V/cm = 5)

    • Options
    • A. 5.3 V
    • B. 10.6 V
    • C. 15.0 V
    • D. 21.2 V
      • Discuss
    • 8. Signal comparisons may be most easily seen when using which item of test equipment?

    • Options
    • A. spectrum analyzer
    • B. multimeter
    • C. function generator
    • D. dual trace oscilloscope
      • Discuss
    • 9. If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:

    • Options
    • A. direct
    • B. alternating
    • C. pulsating
    • D. repetitive
      • Discuss
    • 10. 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
      • Discuss

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