Fundamentals of Electrical Engineering Unit 2 – Steady State Analysis of Single Phase AC Circuits: important questions for AKTU
Unit 2 (Steady State Analysis of Single Phase AC Circuits) questions that AKTU repeats most often. This unit carries about 26 marks per paper. Start with the repeated questions, then the most asked topics.
Most repeated Unit 2 questions
- Consider the tank circuit shown and calculate: (a) Resonant frequencies ω(rad/s) and f(Hz). (b) Q of the circuit at resonance. (c) Voltage across the circuit at resonance. (d) Currents through the inductor and resistor at resonance. (10 marks, 2022, Resonance in AC Circuits) – also asked in 2022, 2023, 2024, 2025, 2026
- Derive mathematically dynamic impedance (ZD) offered by RLC parallel circuit under resonance. Also, draw its phasor diagram. (10 marks, 2022, Resonance in AC Circuits) – also asked in 2022, 2023, 2024, 2025, 2026
- Two coils having resistance 5Ω and 10Ω and inductances 0.04H and 0.05H respectively are connected in parallel across a 200V, 50Hz supply. Calculate: (i) Conductance, susceptance and admittance of each coil. (ii) Total current and power factor. (iii) Power absorbed. (10 marks, 2022, Parallel RLC AC Circuits) – also asked in 2022, 2023, 2024, 2025, 2026
Most important Unit 2 topic
- Resonance in AC Circuits (Unit 2: Steady State Analysis of Single Phase AC Circuits) – asked 15 times in 2022, 2023, 2024, 2025, 2026
Most asked Unit 2 topics
- Resonance in AC Circuits – asked 15 times
- AC Power and Power Factor – asked 11 times
- AC Waveform Fundamentals – asked 7 times
More Unit 2 previous year questions
- Define the expression for form factor and peak factor. (2 marks, 2026, AC Waveform Fundamentals)
- What is the condition for series resonance? What happens to the impedance of a series RLC circuit at resonance? (2 marks, 2026, Resonance in AC Circuits)
- A resistance of 75Ω, an inductance of 0.35H and a capacitance of 150μF are connected in series across a 230V, 50Hz supply. Calculate (i) the resultant current (ii) the phase angle between the resultant current and the supply voltage (iii) power factor of the circuit. (7 marks, 2026, Single Phase RLC Circuits)
- What is meant by bandwidth of a resonant circuit? Draw the resonance curve of a series RLC circuit and prove the bandwidth is ω₂ - ω₁ = R/L. (7 marks, 2026, Resonance in AC Circuits)
- Derive the relation between Phase Voltage & Line voltage for Star connected three phase supply system. A 3 phase, 400-volt supply is connected to a 3 phase star connected balanced load. The line current is 20 amps and the power consumed by the load is 12 KW. Calculate the phase impedance of the load, phase current and power factor. (7 marks, 2026, Three Phase Balanced Circuits)
Unit 2 syllabus topics
- AC Waveform Fundamentals
- Single Phase RLC Circuits
- AC Power and Power Factor
- Resonance in AC Circuits
- Three Phase Balanced Circuits