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InsemOct 20242019 patternTE Electrical

Power Electronics SPPU Insem Question Paper Oct 2024

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
Oct 2024
Max. marks
30
Time
1 Hour
Semester
I
Paper code
[6360]-34

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

Instructions to the candidates

  1. Solve Q1 or Q2; Q3 or Q4.
  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 non-programmable calculator is allowed.

Questions

  1. Q1

    1. a)

      Draw & explain switching characteristics of SCR.

      [7]
    2. b)

      Explain four modes of operation of TRIAC.

      Also asked:Aug 2025

      [8]

  2. Q2

    1. a)

      Explain over voltage & over current protections for SCR.

      [7]
    2. b)

      Define the following terms in SCR. i) Forward break over voltage ii) Latching current iii) Holding current iv) I 2 t rating

      [8]

  3. Q3

    1. a)

      Draw VI characteristics of MOSFET & explain its control.

      [7]
    2. b)

      Explain Class E chopper feeding RLE load in detail.

      [8]

  4. Q4

    1. a)

      What is time ratio control in dc chopper? Explain the use of TRC for controlling the output voltage in choppers.

      [7]
    2. b)

      Explain with a diagram step up chopper and derive the expression for the output voltage. A step up chopper with a pulse width of 150 ms is operating at 220 V dc supply. Compute the load voltage if the blocking period of the device is 40 ms. 

      [8]