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InsemMar 20252019 patternBE Electrical

Switchgear and Protection SPPU Insem Question Paper Mar 2025

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

Open the PDFMost repeated Switchgear and Protection questions
Subject code
403148
Pattern
2019 pattern
Exam
Insem
Session
Mar 2025
Max. marks
30
Time
1 Hour
Semester
VIII
Paper code
[6411]-50

Printed for: B.E. (Electrical) (Insem.)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Use of non-programmable scientific calculator is allowed.
  5. Assume suitable data, if necessary.

Questions

  1. Q1

    1. a)

      This part has equations that don’t show as text. Open the PDF to read it.

      [7]
    2. b)

      Explain need of protective relaying? State and explain different types of faults in power system.

      [8]

  2. Q2

    1. a)

      Derive the torque equation of induction type relay.

      Also asked:Feb 2023

      [7]
    2. b)

      What is Relay? Explain trip circuit of circuit breaker with neat diagram.

      Also asked:Feb 2023

      [8]

  3. Q3

    1. a)

      With neat waveform explain i) Restriking volatage, ii) Recovery voltage.

      [7]
    2. b)

      Discuss the theories of arc interruption. 2

      [8]

  4. Q4

    1. a)

      A 3phase, 50Hz, alternator has inductance of 3 mH/ph and capacitance of 0.025 microfarad/ph, the circuit breaker opens when RMS current is of 8000 Amp. Analyse and Determine. i) Frequency of oscillation ii) Peak restriking voltage iii) Maximum value of RRRV

      Also asked:Mar 2024

      [7]
    2. b)

      Explain phenomenon of current interruption in AC circuit breaker. JJJ

      [8]