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Home Electronics Alternating Current vs Direct Current Comments

  • Question
  • AC effective voltage is named:


  • Options
  • A. average
  • B. peak
  • C. peak-to-peak
  • D. root mean square

  • Correct Answer
  • root mean square 


  • Alternating Current vs Direct Current problems


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    • 1. If a voltmeter measures a sine wave as 500 mV, what would be its average value?

    • Options
    • A. 159.0 mV
    • B. 318.5 mV
    • C. 353.5 mV
    • D. 451.0 mV
    • Discuss
    • 2. What is the peak-to-peak current value when an ammeter measures a 20 mA value?

    • Options
    • A. 14 mA
    • B. 28 mA
    • C. 40 mA
    • D. 57 mA
    • Discuss
    • 3. Which control should be moved to display more cycles of a signal on an oscilloscope?

    • Options
    • A. horizontal position to left or right
    • B. volts/cm to a smaller number
    • C. vertical position to top or bottom
    • D. time/cm to a higher setting
    • Discuss
    • 4. If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?

    • Options
    • A. 100 Hz
    • B. 1000 Hz
    • C. 10 kHz
    • D. 100 kHz
    • Discuss
    • 5. A rectangular wave that has a duty cycle of 50 percent could be called a:

    • Options
    • A. c wave
    • B. sawtooth wave
    • C. square wave
    • D. triangle wave
    • Discuss
    • 6. What is the name of a device that converts sound waves to electrical waves?

    • Options
    • A. an amplifier
    • B. an antenna
    • C. a filter
    • D. a microphone
    • Discuss
    • 7. What is the average value of a 12 V peak wave?

    • Options
    • A. 3.82 V
    • B. 4.24 V
    • C. 7.64 V
    • D. 9.42 V
    • Discuss
    • 8. If the frequency of a radio wave is increased, then its wavelength will:

    • Options
    • A. increase
    • B. decrease
    • C. remain the same
    • D. cannot tell
    • Discuss
    • 9. A triangle wave consists of repeating:

    • Options
    • A. positive ramps only
    • B. negative ramps only
    • C. positive and negative ramps of equal value
    • D. positive and negative ramps of unequal value
    • Discuss
    • 10. One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a waveform period is called a:

    • Options
    • A. focus control
    • B. time/cm control
    • C. intensity control
    • D. volts/cm control
    • Discuss


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