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Home Electronics Alternating Current vs Direct Current Comments

  • Question
  • What are the two main applications for ac?


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

  • Correct Answer
  • power, information 


  • Alternating Current vs Direct Current problems


    Search Results


    • 1. 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
    • 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. A sine wave has:

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

    • Options
    • A. thermocouples
    • B. RTDs
    • C. thermistors
    • D. All of the above
    • Discuss
    • 5. The connections to a thermocouple

    • Options
    • A. can produce an unwanted thermocouple effect, which must be compensated for
    • B. produce an extra desirable thermocouple effect
    • C. must be protected, since high voltages are present
    • D. produce an extra desirable thermocouple effect and must be protected, since high voltages are present
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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