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InsemAug 20252019 patternTE Electrical

Power Electronics SPPU Insem Question Paper Aug 2025

All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Power Electronics questions
Subject code
303142
Pattern
2019 pattern
Exam
Insem
Session
Aug 2025
Max. marks
30
Time
1 Hour
Semester
I
Paper code
[6579]-334

Printed for: T.E. (Electrical Engineering) (Insem)

Instructions to the candidates

  1. Solve Q.1 or Q.2, Q.3 or Q.4.
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherever necessary.
  4. Assume suitable data, if necessary.
  5. Use of electronic packet calculator and smith chart is allowed.

Questions

  1. Q1

    1. a)

      Describe different protections provided to SCR against i) Over voltage ii) Overcurrent iii) dv/dt iv) di/dt v) Thermal

      [7]
    2. b)

      Define following term with respect to SCR and show them on VI and Turn on Characteristics. i) Latching Current ii) Holding Current iii) delay time iv) rise time

      [8]

  2. Q2

    1. a)

      Draw neat diagram of class D commutation and explain its working.

      [7]
    2. b)

      Explain four mode operation of TRIAC.

      Also asked:Oct 2024

      [8]

  3. Q3

    1. a)

      With neat constructional diagram, explain operation of MOSFET. Draw Output and transfer characteristics of MOSFET.

      [7]
    2. b)

      List different voltage control techniques of chopper. Explain any two in detail.

      [8]

  4. Q4

    1. a)

      A chopper circuit is operating on a TRC control mode at a frequency of 2kHz on a 230V dc supply. For output voltage of 170V, find conduction and blocking period of the step down chopper.

      [7]
    2. b)

      What is four quadrants (class E) operation of chopper? Describe with diagram operation of it in each quadrant. 

      [8]