Switchgear and Protection SPPU Endsem Question Paper Nov 2025
All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.
- Subject code
- 403148
- Pattern
- 2019 pattern
- Exam
- Endsem
- Session
- Nov 2025
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- VIII
- Paper code
- [6584]-104
Printed for: B.E. (Electrical Engineering)
Instructions to the candidates
- Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
- Figures to the right indicate full marks.
- Neat diagrams must be drawn wherever necessary.
- Assume suitable additional data, if necessary.
- Use of a non-programmable calculator is allowed.
Questions
Q1
- a)[4]
Explain the following ratings of the circuit breaker. i) Making Capacity ii) Symmetrical Breaking capacity
- b)[6]
Explain the Vacuum Circuit breaker with a neat diagram.
Also asked:May 2025
- c)[8]
A 22 KV, 600MVA, 5 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 short time current rating iv) The peak making current
OR- a)
Q2
- a)[6]
Explain with a neat diagram puffer type SF6 circuit breaker.
Also asked:May 2023
- b)[4]
Describe the following concerned with the circuit breaker i) short time current ii) asymmetrical breaking capacity
- c)[8]
A Vacuum circuit breaker is rated as 3 phase,1600 A, 2000 MVA, 33 KV, 1 second. Determine i) Beaking current ii) Making current iii) STC iv) Rated normal current 2
- a)
Q3
ORQ4
- a)[3]
Draw block diagram of Static Relay.
Also asked:May 2025
- b)[6]
Explain Antialising Filter.
- c)[8]
Describe PMU with its block diagram.
- a)
Q5
- a)[4]
i) Enlist the faults occurring in the alternator. ii) What do you mean by incipient faults in case of transformer.
- b)[6]
Explain the single phasing problem associated with 3-phase Induction Motor and hence suggest suitable protection scheme for it.
- c)[8]
Explain the following abnormal condition with its protection schemes. i) Loss of prime mover ii) Loss of Excitation
OR- a)
Q6
- a)[4]
State abnormal conditions occurring in the Induction motor.
Also asked:May 2025
- b)[6]
With a neat diagram describe the protection scheme for magnetizing inrush protection for the transformer.
- c)[8]
Explain the transverse percentage differential protection scheme for synchronous generators.
- a)
Q7
- a)[3]
Describe the impedance relay for distance protection.
- b)[6]
Explain the effect of Arc resistance on i) Impedance relay ii) MHO relay
- c)[8]
With neat diagram explain three stepped distance protection scheme.
OR- a)
Q8