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Power System Engineering-I important questionsMost repeated in SPPU papers

These 21 questions appeared in more than one SPPU Power System Engineering-I paper we have: 7 papers, from Mar 2024 to Mar 2026. The most-asked come first. Each one links to the papers it was asked in.

All Power System Engineering-I papers and notes

Repeated questions

Endsem questions (19)

  1. 3×asked

    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 

    Nov 2025 ·May 2025 ·Nov 2024

  2. 3×asked

    Derive an expression for ABCD constants of short transmission line.

    Nov 2025 ·May 2025 ·Nov 2024

  3. 3×asked

    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.

    Nov 2025 ·May 2025 ·Nov 2024

  4. 3×asked

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

    Nov 2025 ·May 2025 ·Nov 2024

  5. 3×asked

    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.

    Nov 2025 ·May 2025 ·Nov 2024

  6. 2×asked

    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.

    Nov 2025 ·Nov 2024

  7. 2×asked

    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.

    Nov 2025 ·Nov 2024

  8. 2×asked

    Classify transmission lines based on length and voltage levels.

    Nov 2025 ·May 2025

  9. 2×asked

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

    Nov 2025 ·Nov 2024

  10. 2×asked

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

    Nov 2025 ·Nov 2024

  11. 2×asked

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

    Nov 2025 ·Nov 2024

  12. 2×asked

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

    Nov 2025 ·May 2024

  13. 2×asked

    Explain methods of improving string efficiency.

    Nov 2025 ·Nov 2024

  14. 2×asked

    Explain the concept of GMD and GMR for inductance calculation.

    Nov 2025 ·Nov 2024

  15. 2×asked

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

    Nov 2025 ·Nov 2024

  16. 2×asked

    What is the need of transposition for Capacitance calculation?

    Nov 2025 ·May 2025

  17. 2×asked

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

    Nov 2025 ·Nov 2024

  18. 2×asked

    Derive the expression of capacitance of 3-phase overhead line with unsymmetrical spacing considering transposition.

    May 2025 ·Nov 2024

  19. 2×asked

    The three conductors of a 3-phase line are arranged at the corners of a triangle of sides 2 m, 2.5 m and 4.5 m. Calculate the inductance per km of the line when the conductors are regularly transposed. The diameter of each conductor is 1.24 cm.

    Nov 2024 ·May 2024

Insem questions (2)

  1. 2×asked

    Explain the concepts of Base load plant and peak load plant and hence explain the advantages of interconnected grid system.

    Mar 2026 ·Mar 2025

  2. 2×asked

    State different types of tariff and explain Time of day tariff.

    Mar 2025 ·Mar 2024

Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.