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#### 3-Phase AC Circuits MCQs With Explanatory Answers

This Website provides all the important MCQ questions of AC fundamentals and circuits in detail and also provides some important points about the website.

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Question 1: When two waves are in phase they have peak values at an interval of?

• 180º
• 120º
• none of the above
• 90º
• Answers: none of the above

Question 2: The power factor at resonance in R-L-C parallel circuit is ?

• unity
• 0.08 lagging
• zero

Question 3: Which of the following circuit component opposes the change in the circuit voltage ?

• Resistance
• Inductance
• Conductance
• Capacitance

Question 4: Which of the following waves has the highest value of peak factor?

• Triangular wave
• Half wave rectified sine wave
• Square wave
• Sine wave
• Answers: Half wave rectified sine wave

Question 5: The unit of frequency of an AC signal is ?

• cycle
• hertz/sec
• hertz
• cycle-seo

Question 6: Poor power factor ?

• overloads alternators, transformers and distribution lines
• results in more power losses in the electrical system
• reduces load handling capability of electrical system
• result in all above
• Answers: result in all above

Question 7: The time constant of a series R-C circuit is given by ?

• R²C
• RC
• R/C
• RC²

Question 8: According to which of the alternating current values in the cross-sectional area of a conductor with regard to the heating effect is selected?

• peak value
• average value
• RMS value
• half peak value
• Answers: RMS value

Question 9: Time constant of a capacitive circuit?

• increases with the decrease of capacitance and increase of resistance
• increase with increase of capacitance and increase of resistance
• increases with the increase of capacitance and decrease of resistance
• increases with the decrease of capacitance and decrease of resistance
• Answers: increases with the decrease of capacitance and increase of resistance

Question 10: For the same peak value which of the following wave will have the highest RMS value?

• sine wave
• half wave rectified sine wave
• triangular wave
• square wave
• Answers: square wave

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