Gujarat Technological UniversitySummer 2026 examination

GTU 2170908 Switch Gear and Protection Summer 2026 Question Paper & PDF

B.E. · Electrical Engineering · Semester 7 · Subject code 2170908
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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.1

14 Marks
(a)
3 marks

Discuss various zones of protection for a modern power system. Explain primary and back-up protection.

(b)
4 marks
Write and explain difference between measurement CT & protective CT.
(c)
7 marks
Define following terms
i)Reliability
ii)Selectivity
iii)Discrimination
iv)PSM
v)Burden
vi)Under reach and Over reach of relay
vii)Relay pick up.

Q.2

14 Marks
(a)
3 marks

Explain in brief, how the percentage differential relay overcomes the drawbacks of simple differential relay.

(b)
4 marks
Give classification of different types of relays.
(c)
7 marks

For Impedance, Mho and Reactance relay, explain the effect of power swing with help of suitable relay characteristic diagram.

(c)
7 marks

Explain construction and working principle of induction cup type electromagnetic relays. Derive an expression for torque produced by induction type relay.

Q.3

14 Marks
(a)
3 marks
Draw the block diagram of numerical relay.
(b)
4 marks
Enlist all Arc interruption theories and explain any one of them in detail.
(c)
7 marks
Explain construction and working of SF6 circuit breaker.
(a)
3 marks
Compare Reactance relay with Mho relay.
(b)
4 marks
Explain 3-stepped distance protection.
(c)
7 marks
Explain Transformer Differential protection scheme with necessary diagram.

Q.4

14 Marks
(a)
3 marks
What is the need of Carrier aided protection scheme.
(b)
4 marks
Explain inrush phenomenon in transformer.
(c)
7 marks
Draw and explain protection of generator against unbalanced loading.
(a)
3 marks
Describe protection against loss of excitation in generator.
(b)
4 marks

Explain why the first ground fault on the rotor does not cause any damage while a second fault can be catastrophic.

(c)
7 marks
Explain REF protection of power transformer.

Q.5

14 Marks
(a)
3 marks
Define following terms
i)Recovery voltage
ii)Re-striking voltage
iii)RRRV.
(b)
4 marks
Enlist various faults & abnormal operation conditions of Induction Motor.
(c)
7 marks
Explain any one Feeder protection scheme in detail with suitable schematic diagram.
(a)
3 marks
Why can the secondary of a protection CT not to be open circuited?
(b)
4 marks
Why is protection of an induction motor against reversal of phase sequence required?
(c)
7 marks
Write short note on gas operated relay.

More Switch Gear and Protection papers

Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.

Summer 202570 marks · 5 questions

Other Semester 7 subjects

BE Electrical

2170901
Interconnected Power System
2170909
Design of AC Machines
2170913
Industrial Instrumentation
3170906
Advanced Power Electronics

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About this paper

Official Gujarat Technological University (GTU) examination paper for Switch Gear and Protection (Summer 2026, 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.

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