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

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

- 1.414 Emax
- 0.707 Emax
- 0.636 Emax
- 0.434 Emax

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

**Answers:** 0.636 Emax

- 100 ?
- 25 ?
- 5 ?
- 50 ?

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

**Answers:** 100 ?

- medium
- low
- very low
- high

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

**Answers:** high

- 90º
- 180º
- 30º
- 45°

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

**Answers:** 180º

- none of the above
- lags
- leads
- remains in phase with

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

**Answers:** leads

- resistance
- inductance
- capacitance
- both (a) and (b)

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

**Answers:** both (a) and (b)

- 30
- 45
- 90
- 60

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

**Answers:** 45

- 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

**Question 8:** The frequency of an alternating current is?

**Answers:** the number of waves passing through a point in one second

- RMS value / average value
- RMS value / peak value
- average value / RMS value
- average value / peak value

**Question 9:** Form Factor is the ratio of?

**Answers:** RMS value / average value

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

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

**Answers:** current is maximum

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**Correct: **0 **Wrong: **0

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