Page 70 – Full Length GATE Pattern Mock Test (Power Electronics)
Total Marks: 50
Duration: 45–60 Minutes
🔹 Section A – 1 Mark MCQs (10 × 1 = 10 Marks)
Q1. Buck converter gain is: A) D B) 1/(1−D) C) −D/(1−D) D) 1/D Q2. IGBT is voltage controlled device. (True/False) Q3. Boost converter operates in CCM when inductor current: A) Zero B) Negative C) Never zero D) Sinusoidal Q4. Inversion occurs in full converter when α > ? Q5. Natural frequency of LC circuit equals? Q6. MOSFET is preferred at: A) Low frequency B) High frequency C) High voltage 10kV D) HVDC Q7. Ripple decreases when switching frequency: A) Decreases B) Increases Q8. Buck-Boost polarity: A) Same B) Opposite Q9. ESR introduces: A) Pole B) Zero Q10. DCM gain depends on: A) Only D B) D, R, L, fs🔹 Section B – 2 Marks Numerical (10 × 2 = 20 Marks)
Q11. Buck converter Vin=24V, D=0.5, R=12Ω Find output power. Q12. Boost converter Vin=20V, D=0.6 Find Vo. Q13. Buck-Boost Vin=30V, D=0.4 Find Vo. Q14. Inductor ripple Vin=40V, D=0.5, L=200µH, fs=50kHz Q15. Critical inductance R=10Ω, D=0.5, fs=25kHz Q16. Rectifier Vm=325V, α=60° Q17. Inverter fundamental RMS Vdc=200V Q18. Natural frequency L=100µH, C=100µF Q19. Energy stored L=150µH, I=6A Q20. MOSFET conduction loss Rds=0.25Ω, I=5A🔹 Section C – 3 Marks Tough Problems (5 × 3 = 15 Marks)
Q21. Identify CCM/DCM Vin=24V, D=0.6, L=30µH, R=8Ω, fs=50kHz Q22. SEPIC duty range Vin=15–30V, Vo=20V Q23. Boost efficiency 90% Vin=24V, Vo=48V, Io=4A Find input current. Q24. Buck small-signal order & natural frequency L=200µH, C=50µF Q25. Full converter inversion mode Vm=325V, α=120° Find output.🔹 Answer Key (Brief)
Q1-A Q2-True Q3-C Q4-90° Q5-1/√LC Q6-B Q7-Increases Q8-Opposite Q9-Zero Q10-B Q11-24W Q12-50V Q13-−20V Q14-2A Q15-50µH Q16-103V Q17-180V Q18-10000 rad/s Q19-2.7mJ Q20-6.25W Q21-Compare Lcritical Q22-D=0.4–0.57 Q23-~8.9A Q24-Second order Q25-−103V
Mock Test Strategy
✔ Attempt easy MCQs first ✔ Numerical → check units carefully ✔ Always test CCM/DCM ✔ Keep 5 minutes for review
Power Electronics Full Length Mock – Shaktimatha Learning
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