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Home Electronics Alternating Current vs Direct Current Comments

  • 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 


  • Alternating Current vs Direct Current problems


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    • 1. The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:

    • Options
    • A. amplitude
    • B. frequency
    • C. wavelength
    • D. period
    • Discuss
    • 2. A test equipment item that has the ability to produce either square, triangular, or sawtooth waveforms is called:

    • Options
    • A. a function generator
    • B. a radio frequency generator
    • C. an audio frequency generator
    • D. a frequency meter or counter
    • Discuss
    • 3. What is the name of a device used to directly measure the frequency of a periodic wave?

    • Options
    • A. oscilloscope
    • B. frequency meter or counter
    • C. audio frequency generator
    • D. radio frequency generator
    • Discuss
    • 4. One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a signal amplitude value is called the:

    • Options
    • A. time/cm control
    • B. position control
    • C. intensity control
    • D. volts/cm control
    • Discuss
    • 5. If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?

    • Options
    • A. 14.14 mV
    • B. 35.4 mV
    • C. 63.7 mV
    • D. 70.7 mV
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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