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EndsemMay 20252019 patternBE Electrical

Switchgear and Protection SPPU Endsem Question Paper May 2025

All 8 questions from this SPPU endsem 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
Endsem
Session
May 2025
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6404]-114

Printed for: B.E. (Electrical Engineering)

Instructions to the candidates

  1. Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherever necessary.
  4. Assume suitable additional data, if necessary.
  5. Use of non-programmable calculator is allowed.

Questions

  1. Q1

    1. a)

      Explain following ratings of circuit breaker. i) Symmetrical Breaking Capacity ii) Rated Insulation Level

      Also asked:Nov 2025 ·Nov 2024 ·May 2024

      [4]
    2. b)

      With neat diagram explain Vacuum circuit breaker.

      Also asked:Nov 2025

      [6]
    3. c)

      An 11 KV, 500 MVA, 3 sec circuit breaker suddenly closes on occurring of fault. Determine i) The symmetrical breaking current ii) The asymmetrical breaking current assuming 50% DC component iii) The peak making current iv) The short time current rating

      Also asked:Nov 2025 ·Nov 2024

      [8]

  2. Q2

    1. a)

      Explain following ratings of circuit breaker. i) Making Capacity ii) Breaking Capacity

      Also asked:Nov 2025 ·Nov 2024 ·May 2024

      [4]
    2. b)

      With neat diagram explain Air-Blast circuit breaker.

      Also asked:Nov 2024

      [6]
    3. c)

      A Vacuum circuit breaker is rated as 3 phase,1600 A, 2000 MVA, 33 KV, 1 second. Determine i) Breaking current ii) Making current iii) STC iv) Rated normal current 2

      Also asked:Nov 2025 ·May 2024 ·Nov 2023 ·May 2023

      [8]

  3. Q3

    1. a)

      Draw block diagram of Static Relay.

      Also asked:Nov 2025

      [3]
    2. b)

      Explain in short Phasor Measurement Unit (PMU).

      [6]
    3. c)

      Compare Static Relay with Electromagnetic relay with respective, Construction ,working Principle, advantage and limitations.

      [8]

  4. Q4

    1. a)

      Discuss three merits of Static Relay.

      Also asked:Nov 2025

      [3]
    2. b)

      Explain anti-alising Filter.

      [6]
    3. c)

      Explain with block diagram of Numerical relay.

      Also asked:Nov 2025 ·Nov 2024

      [8]

  5. Q5

    1. a)

      Explain current differential Relay.

      Also asked:Mar 2024

      [4]
    2. b)

      Explain Merz-price Protection of Transformers.

      [6]
    3. c)

      Explain the magnetic inrush current phenomenon in transformer & how to overcome it.

      [8]

  6. Q6

    1. a)

      Draw neat block diagram of Buchholz relay.

      [4]
    2. b)

      State abnormal conditions occur in Induction motor.

      Also asked:Nov 2025

      [6]
    3. c)

      Explain protection against single phasing in 3 phase induction motor.

      [8]

  7. Q7

    1. a)

      Explain Mho Relay.

      [3]
    2. b)

      Explain the effect of Arc resistance on. i) Distance relay ii) MHO relay

      Also asked:Nov 2025 ·Nov 2024 ·May 2024 ·Nov 2023 ·May 2023

      [6]
    3. c)

      Write a short note on Wide Area Measurement (WAM) System.

      Also asked:Nov 2023

      [8]

  8. Q8

    1. a)

      Draw flowchart of Numerical algorithm.

      Also asked:Nov 2024

      [3]
    2. b)

      Explain time graded system protection of three phase feeders using overcurrent relay.

      [6]
    3. c)

      State four advantages and four disadvantages of PLCC. 

      Also asked:Nov 2025

      [8]