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#### AC Fundamentals - Circuits And Circuit Theory MCQ

Multiple Choice Questions and Answers on AC Fundamentals, Circuits and Circuit Theory. Which of the following waves has the highest value of peak factor?

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Question 1: For a sine wave with peak value Emax the average value is?

• 1.414 Emax
• 0.707 Emax
• 0.636 Emax
• 0.434 Emax

Question 2: A sine wave has a frequency of 60 Hz. Its angular frequency is ...... radian/second?

• 100 ?
• 25 ?
• 5 ?
• 50 ?

Question 3: Skin effect occurs when a conductor carries current at ...... frequencies ?

• medium
• low
• very low
• high

Question 4: The negative maximum of a cosine wave occurs at?

• 90º
• 180º
• 30º
• 45°

Question 5: In a parallel R-C circuit, the current always ...... the applied voltage?

• none of the above
• lags
• remains in phase with

Question 6: Power factor of the following circuit will be zero?

• resistance
• inductance
• capacitance
• both (a) and (b)
• Answers: both (a) and (b)

Question 7: The EMS value of a sinusoidal A.C. current is equal to its value at an angle of ...... degrees?

• 30
• 45
• 90
• 60

Question 8: The frequency of an alternating current is?

• the number of electrons passing through a point in one second
• the speed with which the alternator runs
• the number of waves passing through a point in one second
• the number of cycles generated in one minute
• Answers: the number of waves passing through a point in one second

Question 9: Form Factor is the ratio of?

• RMS value / average value
• RMS value / peak value
• average value / RMS value
• average value / peak value
• Answers: RMS value / average value

Question 10: ln a series L-C circuit at the resonant frequency the?

• voltage across C is minimum
• current is minimum
• impedance is maximum
• current is maximum

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