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#### AC Fundamentals Circuits and Circuit Theory MCQ

AC circuit MCQ questions with explanation AC circuit objective questions with answers AC circuit multiple choice questions.

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Question 1: Which of the following coil will have large resonant frequency?

• A coil with large distributed capacitance
• A coil with low resistance
• A coil with low distributed capacitance
• A coil with large resistance
• Answers: A coil with low distributed capacitance

Question 2: In a R-L-C circuit?

• all above are correct
• exchange of power takes place between inductor and supply line
• power is consumed in resistance and is equal to I²R
• exchange of power takes place between capacitor and supply line
• Answers: all above are correct

Question 3: The power consumed in a circuit element will be least when the phase difference between the current and voltage is?

• 180º
• 60º
• 90º

Question 4: In a series resonant circuit, the impedance of the circuit is?

• infinite
• minimum
• zero
• maximum

Question 5: Power factor of the following circuit will be unity?

• inductance
• both (a) and (d)
• resistance
• capacitance

Question 6: For 200 V RMS value-triangular wave, the peak voltage will be?

• 222 V
• 200 V
• 282 V
• 346 V

Question 7: Inductance affects the direct current flow?

• at all the time of operation
• at the time of turning on and off
• only at the time of turning off
• only at the time of turning on
• Answers: at the time of turning on and off

Question 8: The product of apparent power and cosine of the phase angle between circuit voltage and current is ?

• instantaneous power
• reactive power
• true power
• volt-amperes

Question 9: The purpose of a parallel circuit resonance is to magnify ?

• voltage
• frequency
• current
• power

Question 10: In a pure resistive circuit?

• current can lead or lag the voltage by 90°
• current leads the voltage by 90º
• current lags behind the voltage by 90º
• current is in phase with the voltage
• Answers: current is in phase with the voltage

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