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Alternating Current vs Direct Current problems


  • 1. A sine wave has:

  • Options
  • A. four quadrants
  • B. two alternations
  • C. one period
  • D. all of the above
  • Discuss
  • 2. 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
  • 3. The current is flowing in what direction?

    Electronics Alternating Current vs Direct Current: 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
  • 4. What are the two main applications for ac?

  • Options
  • A. direct, pulsating
  • B. electric, magnetic
  • C. power, information
  • D. static, dynamic
  • Discuss
  • 5. 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
  • 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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