Q.1
14 Marks(a)
Define Load Curve. Explain the importance of load curve.
(b)
What is Tariff? State the objectives of tariff.
(c)
Draw schematic diagram of a typical Steam Thermal Power Station.
Gujarat Technological UniversitySummer 2026 examination
GTU BE04009041 Power Systems I Summer 2026 Question Paper & PDF
B.E. · Electrical Engineering · Semester 4 · Subject code BE04009041
- 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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Q.2
14 Marks(a)
Derive formula for flux linkages of a single isolated current carrying conductor due to its internal flux.
(b)
Derive formula for capacitance of a single phase transmission line.
(c)
Derive formula for inductance of a three phase transmission line with,
1Symmetrical spacing
2Unsymmetrical spacing
OR
(c)
A three phase overhead transmission line has its conductors placed in a vertical plane with the distance between two adjacent conductors to be 2 metre. If the radius of each conductor is 1 cm, calculate:
1Inductance per phase per km, and
2Capacitance between each phase and neutral per km Assume the line to be regularly transposed.
Q.3
14 Marks(a)
With a neat sketch, describe the construction of an underground cable.
(b)
Derive formula for the dielectric stress in a single core cable.
(c)
Explain the Method of Images to consider the effect of ground on capacitance of an overhead transmission line.
OR
(a)
Derive formula for the most economic conductor size in an underground cable.
(b)
Derive formula for Capacitance of a Single Core Underground Cable.
(c)
What is Grading in underground cables? Explain Inter-sheath Grading.
Q.4
14 Marks(a)
Compare Indoor and Outdoor Substations.
(b)
State the advantages and disadvantages of using Aluminium as conductor material instead of copper.
(c)
Derive formula for Sag in an overhead transmission line when the supports are
1)at
equal levels
2)at unequal levels.
OR
(a)
Draw symbols for the following equipment as prescribed by Indian standards.
1Bus-bar
2Single Break Isolator Switch (Make Contact)
3Lightning Arrester
4Star-Delta Connected Power Transformer
5Potential Transformer
6Current Transformer
(b)
Differentiate between Equipment Earthing and Neutral Earthing. Define Step Potential and Touch Potential
(c)
Explain the concept of Arcing Grounds on an ungrounded neutral system.
Q.5
14 Marks(a)
Explain how effect of wind and ice loading can be taken into consideration while calculating sag in an overhead line.
(b)
Explain methods of improving String Efficiency of a Suspension Insulator String.
(c)
Compare Overhead Vs. Underground Distribution Systems
OR
(a)
Describe major causes of low power factor.
(b)
A three phase a.c. generator supplies the following loads.
1)Lighting load of 20 kW at unity p.f.
2)Induction motor load of 100 kW at 0.707 p.f. lagging
3)Synchronous motor load of 50 kW at 0.9 p.f. leading
Calculate the total kW and kVA delivered by the generator and the p.f. at which it
works.
(c)
Explain the concept of Arc Suppression Coil Grounding and derive formula for inductance of arc suppression coil.
Other Semester 4 subjects
BE Electrical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Power Systems I (Summer 2026, B.E. · Electrical Engineering, Sem 4). 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.