Power Electronics SPPU Endsem Question Paper Nov 2025
All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.
- Subject code
- 303142
- Pattern
- 2019 pattern
- Exam
- Endsem
- Session
- Nov 2025
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- V
- Paper code
- [6583]-69
Instructions to the candidates
- Solve Q.1 or Q.2, Q.3 or Q.4, Q. 5 or Q. 6, Q. 7 or Q. 8.
- Figures to the right side indicate full marks.
- Neat diagrams must be drawn wherever necessary.
- Assume suitable additional data, jf necessary.
- Use of non-programmable calculator is allowed.
Questions
Q1
- a)[9]
Draw and explain Single phase semi converter feeding R load with output voltage and current wave forms. Also derive output average and rms voltage equation.
- b)[9]
Explain working of a single phase half controlled bridge converter without freewheeling diode feeding RL load with neat circuit diagram and output voltage and current waveform.
OR- a)
Q2
- a)[4]
A fully controlled single phase bridge rectifier is supplied from a 50 Hz, 230/100 V transformer. The rectifier supplying a highly inductive load of 15 resistor. For a firing angle of 60°, determine the rectified voltage, the rectified current:
- b)[6]
Explain how single phase full converter can operate as rectification and inversion mode with the help of output voltage waveforms with proper firing angle.
- c)[8]
Describe working of circulating current type single phase dual converter with waveforms. 2
- a)
Q3
- a)[3]
Compare Three phase Semi converter and Three phase fully controlled converters based on Number of SCRs, Quadrant of Operation, and Modes of Operation.
- b)[6]
Explain working of two stage AC Voltage regulator with RL Load. Draw output voltage waveforms.
- c)[8]
Draw and explain working of Three phase semi controlled converter connected to R Load with neat circuit diagram and waveforms for firing angle = 30° and =0°
OR- a)
Q4
- a)[3]
Draw single phase AC Voltage regulator with R Load and output voltage waveforms.
- b)[8]
Draw and explain 3 full converter with freewheeling diode for RL load. Draw output voltage and current waveforms for = 30° and = 0°.
- c)[6]
A Three phase full converter operating from three phase, star connected, 415 V, 50 . Hz supply with resistive load. Determine average output voltage for continuous. mode at =65.77° and discontinuous mode at =l26.l2°.
- a)
Q5
- a)[4]
Compare VSI & CSI (4 Points)
- b)[6]
Explain working of single-phase full bridge voltage source Inverter connected to RL load with neat circuit diagram. Draw output voltage and current waveforms.
- c)[8]
Explain sinusoidal pulse width modulation used in inverters. Show four pulses per half cycle of O/P voltage.
OR- a)
Q6
- a)[4]
What is mean by Load Commutated CSI.
- b)[6]
Explain working of single-phase current source inverter with neat circuit diagram. Draw output voltage and current waveforms
- c)[8]
What is the need of controlling o/p voltage of an inverter? Explain briefly and compare various methods employed for the control of o/p voltage in inverter. 3
- a)
Q7
- a)[10]
With the help of neat circuit diagram, six steps of output voltage waveforms, explain the operation of 180º conduction mode 3 voltage source inverter for resistive load.
- b)[7]
Draw circuit diagram of three level flying capacitor converter and explain its principle and working of operation
OR- a)
Q8
- a)[5]
What is necessity of using Multilevel Inverters? Draw circuit diagram of H bridge multilevel Inverter. .
Also asked:May 2024
- b)[6]
Compare multi-pulse and multilevel inverters.
Also asked:May 2024
- c)[6]
This part has equations that don’t show as text. Open the PDF to read it.
- a)