The GATE Grind

GATE Power Electronics: Single-phase and three-phase voltage and current source inverters, sinusoidal pulse width modulation – Previous Year Questions

13 GATE previous year questions on Single-phase and three-phase voltage and current source inverters, sinusoidal pulse width modulation (Power Electronics, Electrical Engineering) with answers and explanations, from every paper.

  1. GATE 2017 EE Q34 (1 mark, Numerical answer) – In the converter circuit shown below, the switches are controlled such that the load voltage v o(t) is a 400 Hz square wave. [Figure: A full-bridge…
  2. GATE 2017 EE Q35 (1 mark, Numerical answer) – A 3-phase voltage source inverter is supplied from a 600 V DC source as shown in the figure below. For a star connected resistive load of 20 per…
  3. GATE 2015 EE Q43 (2 marks, Numerical answer) – The single-phase full-bridge voltage source inverter (VSI), shown in figure, has an output frequency of 50 Hz. It uses unipolar pulse width modulation…
  4. GATE 2016 EE Q54 (2 marks, Numerical answer) – The switches T1 and T2 in Figure (a) are switched in a complementary fashion with sinusoidal pulse width modulation technique. The modulating voltage…
  5. GATE 2016 EE Q60 (2 marks, Multiple choice) – A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate…
  6. GATE 2019 EE Q35 (1 mark, Numerical answer) – The output voltage of a single-phase full bridge voltage source inverter is controlled by unipolar PWM with one pulse per half cycle. For the…
  7. GATE 2020 EE Q32 (1 mark, Numerical answer) – A single-phase inverter is fed from a 100 V dc source and is controlled using a quasi-square wave modulation scheme to produce an output waveform,…
  8. GATE 2021 EE Q65 (2 marks, Numerical answer) – A single-phase full-bridge inverter fed by a 325 V DC produces a symmetric quasi-square waveform across 'ab' as shown. To achieve a modulation index…
  9. GATE 2022 EE Q58 (2 marks, Numerical answer) – Consider an ideal full-bridge single-phase DC-AC inverter with a DC bus voltage magnitude of 1000 V. The inverter output voltage v(t) shown below, is…
  10. GATE 2022 EE Q60 (2 marks, Numerical answer) – A 3-phase grid-connected voltage source converter with DC link voltage of 1000 V is switched using sinusoidal Pulse Width Modulation (PWM) technique.…
  11. GATE 2024 EE Q63 (2 marks, Numerical answer) – A single-phase full bridge voltage source inverter (VSI) feeds a purely inductive load. The inverter output voltage is a square wave in 180 conduction…
  12. GATE 2025 EE Q46 (2 marks, Multiple choice) – The 3-phase modulating waveforms (v a(t), v b(t) and v c(t)), used in sinusoidal PWM in a Voltage Source Inverter (VSI) are v a(t)=0.8( t) V v…
  13. GATE 2026 EE Q47 (2 marks, Multiple choice) – Consider the single-phase voltage source inverter circuit feeding an inductive load (L). Assume that the power MOSFET switches are ideal. S 1 and S 2…