Q.1
14 Marks(a)
What is a fault? What are the causes and effects of a fault?
(b)
Explain the protective zone with respect to protective system.
(c)
Derive the expression for the torque of an induction disc type relay.
Gujarat Technological UniversitySummer 2025 examination
GTU 2170908 Switch Gear and Protection Summer 2025 Question Paper & PDF
B.E. · Electrical Engineering · Semester 7 · Subject code 2170908
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 2:30 PM – 5:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Define following terms
i)Reliability
ii)Selectivity
iii)Reach.
(b)
Classify: measurement CT and protective CT
(c)
Explain the construction and working of the numerical relay.
OR
(c)
Explain working principle of Percentage Differential Protection.
Q.3
14 Marks(a)
What are the drawbacks of over-current protection?
(b)
Explain magnetizing inrush phenomenon of transformer.
(c)
Write short note on Buchholz relay.
OR
(a)
Explain the effect of Arc Resistance on Reach of MHO relay.
(b)
Explain Three step distance protection.
(c)
Explain Restricted Earth Fault Protection of power transformer.
Q.4
14 Marks(a)
Explain: Single phasing and ground fault of induction motor protection.
(b)
How protection against single phasing is provided?
(c)
Explain phase comparison relaying (unit scheme).
OR
(a)
Enlist the various equipment used for carrier aided protection of transmission lines.
(b)
Explain protection of generator against unbalanced loading
(c)
List and explain different protections used for an induction motor.
Q.5
14 Marks(a)
Discuss the effect of natural frequency on TRV.
(b)
Explain Re-striking voltage transient characteristics of CB.
(c)
Discuss constructional features and working of Air CB.
OR
(a)
Discuss Slepian’s theory of arc extinction.
(b)
Explain current chopping.
(c)
Explain SF6 circuit breaker with neat sketch diagram.
More Switch Gear and Protection papers
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Other Semester 7 subjects
BE Electrical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Switch Gear and Protection (Summer 2025, B.E. · Electrical Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.