3-Phase AC Circuits MCQs With Explanatory Answers
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This Website provides all the important MCQ questions of AC fundamentals and circuits in detail and also provides some important points about the website.
- 180º
- 120º
- none of the above
- 90º
Question 1: When two waves are in phase they have peak values at an interval of?
Answers: none of the above
- unity
- 0.08 lagging
- zero
- 0.8 leading
Question 2: The power factor at resonance in R-L-C parallel circuit is ?
Answers: unity
- Resistance
- Inductance
- Conductance
- Capacitance
Question 3: Which of the following circuit component opposes the change in the circuit voltage ?
Answers: Capacitance
- Triangular wave
- Half wave rectified sine wave
- Square wave
- Sine wave
Question 4: Which of the following waves has the highest value of peak factor?
Answers: Half wave rectified sine wave
- cycle
- hertz/sec
- hertz
- cycle-seo
Question 5: The unit of frequency of an AC signal is ?
Answers: hertz
- 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
Question 6: Poor power factor ?
Answers: result in all above
- R²C
- RC
- R/C
- RC²
Question 7: The time constant of a series R-C circuit is given by ?
Answers: RC
- peak value
- average value
- RMS value
- half peak value
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?
Answers: RMS value
- 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
Question 9: Time constant of a capacitive circuit?
Answers: increases with the decrease of capacitance and increase of resistance
- sine wave
- half wave rectified sine wave
- triangular wave
- square wave
Question 10: For the same peak value which of the following wave will have the highest RMS value?
Answers: square wave
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