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A.C. Fundamentals, Circuits and Circuit Theory

Free 110+ A.C. Fundamentals, Circuits and Circuit Theory MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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A.C. Fundamentals, Circuits and Circuit Theory — MCQs for Pakistan government job tests

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A.C. Fundamentals, Circuits and Circuit Theory

Practice questions

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1.In a series L-C circuit operating at its resonant frequency, what is the behavior of the current?

2.In an alternating current (AC) circuit, which of the following statements is always true?

3.How does the time constant of a capacitive circuit change with variations in capacitance and resistance?

4.How does the inductance of a coil change when the supply frequency increases?

5.What is true about the power in an ideal inductive circuit?

6.How does the time constant of an inductive circuit change with variations in inductance and resistance?

7.In an R-L-C circuit operating at resonance, the magnitude of the current primarily depends on which parameter?

8.In a series R-L-C circuit, which component(s) can be adjusted to alter the resonance frequency?

9.What is the formula for the time constant in a series resistor-capacitor (R-C) circuit?

10.When does a purely inductive circuit absorb power from an alternating current source?

11.Which component in an electrical circuit resists variations in voltage?

12.What is the power factor of an electric bulb?

13.In an electrical circuit, the time constant represents the duration in seconds after voltage is applied for the response to reach what fraction of its final value?

14.What is the maximum current that a human body can safely tolerate for over three seconds?

15.In an R-L series circuit with a resistance of 20 Ω and an inductance of 27 H, what is the time constant of the circuit?

16.Which of the following statements accurately describe power behavior in an R-L-C circuit?

17.Given a sinusoidal current with a frequency of 50 Hz and an RMS value of 30 A, which of the following expressions correctly describes this waveform?

18.Which type of coil exhibits a higher resonant frequency?

19.In an alternating current (AC) circuit, what does a relatively small reactive power (kVAR) compared to the active power (kW) signify?

20.An AC circuit has an apparent power of 40 kVA with a power factor of 0.8 lagging. What is the real power consumed by this circuit?

How to prepare with A.C. Fundamentals, Circuits and Circuit Theory MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how A.C. Fundamentals, Circuits and Circuit Theory appears in real exam conditions.

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