Alternating Current vs Direct Current Questions and Answers

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Showing 10 of 17 questions
Q1
What are the two main applications for ac?
  • A direct, pulsating
  • B electric, magnetic
  • C power, information
  • D static, dynamic
Answer: Option C
Q2
The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:
  • A amplitude
  • B frequency
  • C wavelength
  • D period
Answer: Option C
Q3
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:
  • A time/cm control
  • B position control
  • C intensity control
  • D volts/cm control
Answer: Option D
Q4
If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:
  • A direct
  • B alternating
  • C pulsating
  • D repetitive
Answer: Option C
Q5
What voltage will an ac voltmeter display?
  • A rms
  • B average
  • C peak-to-peak
Answer: Option A
Q6
What is the peak value of a household appliance that uses a 230 V ac source?
  • A 163 V
  • B 230 V
  • C 325 V
  • D 480 V
Answer: Option C
Q7
What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?
  • A 3 ms
  • B 16 ms
  • C 4 ms
  • D 20 ms
Answer: Option A
Q8
Test equipment selection enables the technician to both generate signals and:
  • A change circuit conditions
  • B inject signals
  • C sense circuit conditions
  • D change signal frequencies
Answer: Option C
Q9
Why is ac current transfer more effective than dc current transfer over long distances?
  • 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
Answer: Option C
Q10
Which percentages of full-amplitude rise time are used for a pulse wave?
  • A 0 to 50 percent
  • B 0 to 100 percent
  • C 5 to 95 percent
  • D 10 to 90 percent
Answer: Option D

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