Q.1
14 Marks(c)
Discuss the phenomenon of wave reflection and refraction. Derive expression for reflection and refraction.
Also asked in Summer 2026 Q5c, Summer 2023 Q5b OR
Gujarat Technological UniversityWinter 2023 examination
GTU 3150911 Power System- II Winter 2023 Question Paper & PDF
B.E. · Electrical Engineering · Semester 5 · Subject code 3150911
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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16 of 25 questions on this paper were also asked in other years. 3 more are types of question GTU sets again with new data. Each is marked below with the years it appeared.See all 27 repeated 3150911 questions, most asked first
Q.2
14 Marks(a)
What is meant by corona? Why does it occur?
(b)
What is difference between visual critical voltage and disruptive critical voltage?
Also asked in Summer 2026 Q5a OR
(c)
Discuss in detail factors and conditions affecting corona loss.
Also asked in Summer 2026 Q5b, Summer 2025 Q4b OR
OR
(c)
A 3 phase overhead line has conductors of 30 mm diameter and arranged in the form of equilateral triangle. Assume fair weather conditions, air density factor of 0.95 and irregular factor of 0.95. Find minimum spacing between conductors if disruptive critical voltage is not to exceed 230 kV between lines. Breakdown strength of air is 30 kV/CM
Also asked in Summer 2025 Q4c OR, Summer 2023 Q4b OR
Q.3
14 Marks(a)
Differentiate between nominal T and equivalent T circuits.
(b)
Why equivalent π circuit of a long line is preferred to the equivalent T circuit?
(c)
Draw the phasor diagrams of nominal π circuit and nominal T circuit of a transmission line. Derive expressions for sending end voltage and current in each case.
Also asked in Summer 2026 Q2c OR
OR
(b)
Why representation of a line by lumped parameters gives inaccurate results for long lines?
(c)
Starting from first principles deduce expression for ABCD constants for a long line in terms of its parameters. Define propagation constant and characteristic impedance.
Also asked in Summer 2026 Q1c, Summer 2023 Q2c
Q.4
14 Marks(a)
What is the difference between symmetrical and unsymmetrical faults?
Also asked in Summer 2023 Q2a
(b)
List the steps to calculations fault calculations.
(c)
Calculate the sub transient fault current in each phase for a dead short circuit on one phase to ground at bus Q for the system shown in Fig. 1 Fig. 1 All reactance are in p.u. on generator base.
Also asked in Summer 2023 Q3c, Summer 2023 Q4c OR
OR
(a)
How can effect of load current can be taken in to account in fault calculation?
(b)
Write a short note on selection of circuit breaker.
Also asked in Summer 2026 Q3b, Summer 2023 Q3b
(c)
Using appropriate interconnection of sequence networks, derive the equation for a line to line fault in a power system with fault impedance of Zf.
Also asked in Summer 2026 Q4c
Q.5
14 Marks(a)
Give classification of faults and discuss their nature of occurrence.
Also asked in Summer 2025 Q3a
(b)
Derive necessary equations to convert (a) phase quantities into symmetrical components (b) symmetrical components in to phase quantity.
Also asked in Summer 2025 Q3b OR
(c)
Discuss the significance of zero sequence circuit. Why should Zn appear as 3Zn in zero sequence equivalent circuit?
Also asked in Summer 2026 Q4a OR
OR
(b)
Draw zero sequence network of a three phase transformer with
1)Star-Star connection with both neutrals grounded
2)Star delta connection with star side neutral grounded
Also asked in Summer 2026 Q3c, Summer 2025 Q3c OR, Summer 2023 Q4a
More Power System- II papers
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Other Semester 5 subjects
BE Electrical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Power System- II (Winter 2023, B.E. · Electrical Engineering, Sem 5). 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.