Alternating Current Vs Direct Current(Engineering > Electrical Engineering ) Questions and Answers

Question 1.  What are the two main applications for ac?
  1.    direct, pulsating
  2.    electric, magnetic
  3.    power, information
  4.    static, dynamic
Explanation:-
Answer: Option C. -> power, information
Question 2.  What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?
  1.    3 ms
  2.    16 ms
  3.    4 ms
  4.    20 ms
Explanation:-
Answer: Option A. -> 3 ms
Question 3.  What voltage will an ac voltmeter display?
  1.    rms
  2.    average
  3.    peak
  4.    peak-to-peak
Explanation:-
Answer: Option A. -> rms
Question 4.  The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:
  1.    amplitude
  2.    frequency
  3.    wavelength
  4.    period
Explanation:-
Answer: Option C. -> wavelength
Question 5.  What is the peak value of a household appliance that uses a 230 V ac source?
  1.    163 V
  2.    230 V
  3.    325 V
  4.    480 V
Explanation:-
Answer: Option C. -> 325 V
Question 6.  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:
  1.    time/cm control
  2.    position control
  3.    intensity control
  4.    volts/cm control
Explanation:-
Answer: Option D. -> volts/cm control
Question 7.  If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:
  1.    direct
  2.    alternating
  3.    pulsating
  4.    repetitive
Explanation:-
Answer: Option C. -> pulsating
Question 8.  Test equipment selection enables the technician to both generate signals and:
  1.    change circuit conditions
  2.    inject signals
  3.    sense circuit conditions
  4.    change signal frequencies
Explanation:-
Answer: Option C. -> sense circuit conditions
Question 9. . A sine wave reaches maximum positive voltage at:
  1.    90°
  2.    0°
  3.    –90°
  4.    360°
Explanation:-
Answer: Option A. -> 90°
Question 10.  Why is ac current transfer more effective than dc current transfer over long distances?
  1.    due to the height of power lines
  2.    due to the use of ac generators
  3.    due to step-up and step-down transformers reducing I2R losses
  4.    due to very high voltages
Explanation:-
Answer: Option C. -> due to step-up and step-down transformers reducing I2R losses
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