Alternating Current vs Direct Current Questions

• A sine wave has:
• What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?
• The current is flowing in what direction?
• What are the two main applications for ac?
• The phase difference between sine waves of different frequencies is:
• Test equipment selection enables the technician to both generate signals and:
• 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)
• Signal comparisons may be most easily seen when using which item of test equipment?
• If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:
• Power companies supply ac, not dc, because:
• If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?
• 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:
• What is the name of a device used to directly measure the frequency of a periodic wave?
• A test equipment item that has the ability to produce either square, triangular, or sawtooth waveforms is called:
• The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:
• Why is ac current transfer more effective than dc current transfer over long distances?
• A rectangular wave that has a duty cycle of 50 percent could be called a:
• If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?
• Which control should be moved to display more cycles of a signal on an oscilloscope?
• What is the peak-to-peak current value when an ammeter measures a 20 mA value?