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EndsemNov 20252019 patternSE Electrical

Power System Engineering-I SPPU Endsem Question Paper Nov 2025

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Power System Engineering-I questions
Subject code
203145
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2025
Max. marks
70
Time
2½ Hours
Semester
IV
Paper code
[6582]-11

Printed for: S.E. (Electrical Engineering)

Instructions to the candidates

  1. Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Neat diagrams must be drawn whenever necessary.
  3. Figures to the right indicate full marks.
  4. Assume suitable data, if necessary.
  5. Use of Non-Programmable Calculator is allowed.

Questions

  1. Q1

    1. a)

      Enlist the main components of overhead lines, and discuss any one in detail.

      [4]
    2. b)

      Define string efficiency. Derive the expression for string efficiency of a suspension insulator consisting of three discs.

      Also asked:Nov 2024

      [6]
    3. c)

      Each line of a 3-phase system is suspended by a string of 3 similar insulators. If the voltage across the line unit is 17.5 kV, calculate the line to neutral voltage. Assume that the shunt capacitance between each insulator and earth is 1/8th of the capacitance of the insulator itself. Also find the string efficiency.

      [8]

  2. Q2

    1. a)

      Explain methods of improving string efficiency.

      Also asked:Nov 2024

      [4]
    2. b)

      Derive an expression for sag in case of overhead transmission line when the supports are at equal level.

      Also asked:Nov 2024

      [6]
    3. c)

      An insulator string consists of three units, each having a safe working voltage of 15kV. The ratio of self-capacitance to shunt capacitance of each unit is 8:1. Find the maximum safe working voltage of the string. Also find the string efficiency.

      Also asked:Nov 2024

      [8]

  3. Q3

    1. a)

      Write a short note on : i) Skin effect ii) Proximity effect.

      Also asked:Nov 2024

      [3]
    2. b)

      What are bundled conductors? Discuss the advantages of bundled conductors when used for overhead lines.

      [6]
    3. c)

      Derive an expression for inductance of three phase transmission line with symmetrical spacing. Draw a neat diagram.

      Also asked:May 2025 ·Nov 2024

      [8]

  4. Q4

    1. a)

      Explain the concept of GMD and GMR for inductance calculation.

      Also asked:Nov 2024

      [3]
    2. b)

      Derive an expression for capacitance per kilometre of single phase overhead line having distance 'd' between the conductors and 'r' is the radius of each conductor.

      Also asked:May 2025 ·Nov 2024

      [6]
    3. c)

      A3-phase, 50 Hz, 132 kV overhead line has conductors placed in a horizontal plane 4 m apart. Conductor diameter is 2cm. If the line length is 100 km, calculate the charging current per phase assuming complete transposition.

      Also asked:Nov 2024

      [8]

  5. Q5

    1. a)

      Derive an expression for capacitance per kilometre of single phase overhead line.

      Also asked:May 2025 ·Nov 2024

      [4]
    2. b)

      What do you understand by electric potential? Derive an expression for Electric potential at conductor in a group of charged conductors.

      Also asked:Nov 2024

      [6]
    3. c)

      Derive an expression for the capacitance to neutral of a three phase line with equilateral spacing.

      Also asked:Nov 2024

      [8]

  6. Q6

    1. a)

      What is the need of transposition for Capacitance calculation?

      Also asked:May 2025

      [4]
    2. b)

      Derive the expression for capacitance of single phase transmission line considering effect of earth.

      Also asked:May 2024

      [6]
    3. c)

      A 3-phase, 50 Hz, 66 kV overhead line conductors are placed in a horizontal plane as shown in Fig. The conductor diameter is 1.25 cm. If the line length is 100km, calculate i) Capacitance per phase ii) Charging current per phase, Assuming complete transposition of the line 2m 2.5m 4.5m

      Also asked:Nov 2024

      [8]

  7. Q7

    1. a)

      State and expalin in short Ferranti effect?

      [3]
    2. b)

      Derive an expression for ABCD constants of short transmission line.

      Also asked:May 2025 ·Nov 2024

      [6]
    3. c)

      Obtain the relationship between sending end voltage and current in terms of receiving end voltage and current for a medium transmission line using 'nominal T' method. Draw a neat phasor diagram.

      Also asked:May 2025 ·Nov 2024

      [8]

  8. Q8

    1. a)

      Classify transmission lines based on length and voltage levels.

      Also asked:May 2025

      [3]
    2. b)

      Derive the expression for ABCD constants of medium transmission line considering nominal '  ' model of the line.

      Also asked:May 2025 ·Nov 2024

      [6]
    3. c)

      An overhead 3-phase transmission line delivers 5000 kw at 22 kV at 0.8 p.f. lagging . The resistance and reactance of each conductor is 4  and 6  . Respectively. Determine i) Sending end voltage ii) Percentage regulation iii) Transmission efficiency 

      Also asked:May 2025 ·Nov 2024

      [8]