Power Electronics SPPU Endsem Question Paper May 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
- May 2025
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- V
- Paper code
- [6403]-62
Printed for: T.E. (Electrical)
Instructions to the candidates
- Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
- Neat diagrams must be drawn wherever necessary.
- Figures to the right indicates full marks.
- Use of Calcuator is allowed.
- Assume Suitable data if necessary.
Questions
Q1
- a)[6]
Describe working of single phase semi converter with RL load. Draw waveforms of load voltage, load current.
Also asked:May 2024
- b)[6]
A single phase fully controlled converter is supplied from 230V, 50Hz source. The load consists of R= 10 and a large inductance so as to render the load current constant. For a firing delay of 45º determine : i) Average output voltage ii) Average output current.
- c)[6]
Describe working of circulating current type single phase dual converter with waveforms.
OR- a)
Q2
- a)[6]
Compare- single phase Fully controlled converter and single phase semi converter on following points. i) Output voltage waveform for R load ii) Output voltage waveform for RL load iii) Average output voltage for R & RL load
- b)[6]
Draw and explain single phase fully controlled converter feeding R-L load with output voltage and current waveform.
- c)[6]
A single phase half controlled bridge converter feeds a load comprising of a resistance of 10 ohm and a large inductance to provide a constant and ripple free current. Calculate the average value of output voltage and current. Firing angle is 45° and input ac voltage is 120V, 50Hz. 2
- a)
Q3
- a)[5]
Draw output voltage waveform for three phase fully controlled converter with R load for = 60°.
- b)[5]
A three phase fully controlled converter is fed from 3 phase, 400V, 50Hz source and is connected to a resistive load of 10 ohm per phase. Calculate the average value of load voltage and current for a firing angle of 30º.
- c)[8]
Describe working of three phase Semi converter with output waveforms for firing angle of 60° with RL load
OR- a)
Q4
- a)[5]
Explain single phase ac regulator feeding RL load. Draw output voltage waveform.
- b)[5]
Derive expression for RMS output voltage ( V rms ) and current ( I rms ) of single phase ac voltage regulator feeding R load.
- c)[8]
Draw neat diagram of two stage AC voltage regulator and explain its working for R load.
- a)
Q5
- a)[5]
State different voltage control techniques used in single phase inverter. Elaborate any one method in detail.
- b)[5]
Explain Sinusoidal Pulse width modulation with necessary waveforms.
Also asked:Nov 2023
- c)[7]
This part has equations that don’t show as text. Open the PDF to read it.
OR- a)
Q6
- a)[5]
Compare VSI and CSI
- b)[5]
With neat circuit diagram and waveforms, explain operation of single phase current source inverter.
- c)[7]
Explain working of single phase full bridge voltage source inverter. Draw all waveforms. 3
- a)
Q7
ORQ8
- a)[10]
Explain working of three phase six step voltage source inverter in 120º mode of operation. For star connected load draw output voltage waveforms. Show devices conducting in each step.
- b)[7]
List different harmonic elimination techniques used in inverter. Explain any two methods in detail.
- a)