AC Circuit objective questions (mcq) and answers


11.  When an alternating current passes through an ohmic resistance the electrical power converted into heat is


   A. Apparent power

   B. True power

   C. Reactive power

   D. None of the above


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B. True power

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12.  In an AC circuit ( sine wave ) with R and L in series


   A. Voltage across R and L 180o out of face

   B. The voltage across R lags the voltage across L by 90o

   C. The voltage across R leads the voltage across L by 90o

   D. Voltage across R and L are in phase


✔ View Answer


B. The voltage across R lags the voltage across L by 90o

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13.  In AC circuit the power curve is a sine wave having


   A. Double the frequency of voltage

   B. Same frequency as that of voltage

   C. Half the frequency of the voltage

   D. Three times the frequency of the voltage


✔ View Answer


A. Double the frequency of voltage

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14.  A parallel AC circuit in resonance will


   A. Have current in each section equal to the line current

   B. Have a high-voltage developed across each inductive and capacitive section

   C. Act like a resister of low value

   D. Have a high impedance


✔ View Answer


D. Have a high impedance

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15.  The square waveform of current has following relation between r.m.s. value and average value


   A. r.m.s. value is equal to average value

   B. r.m.s. value of current is greater than average value

   C. r.m.s. value of current is less than average value

   D. None of the above


✔ View Answer


A. r.m.s. value is equal to average value

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