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ENEE 401Bachelor in Electrical Engineering · Semester 71 Paper Available

High Voltage Engineering

Past examination question papers and complete curriculum syllabus for High Voltage Engineering (ENEE 401), Bachelor in Electrical Engineering Semester 7 under Institute of Engineering (IOE), Tribhuvan University.

Past Question Papers (PDF)

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Note: This question paper file (8th sem) was archived from an IOE exam session for the common High Voltage Engineering curriculum.

8th-sem_High Voltage Engineering.pdf

IOE Past Examination Paper

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Most Frequently Asked Questions

Top recurring IOE board exam questions for High Voltage Engineering with verified mark schemes, formula notation, and recurrence frequency.

Showing 30 of 30 top repeated questions

Conduction and Breakdown in Gaseous Dielectrics

5 Questions
#1Repeated 4 Times[8 Marks]Conduction and Breakdown in Gaseous Dielectrics
Explain Townsend's first and second ionization coefficients ($\alpha$ and $\gamma$). Derive the Townsend breakdown criterion: $\gamma (e^{\alpha d} - 1) = 1$.
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra2076 Chaitra
#2Repeated 3 Times[8 Marks]Conduction and Breakdown in Gaseous Dielectrics
State and explain Paschen's Law: $V_b = f(pd)$. Derive the expression for minimum breakdown voltage $(V_b)_{min}$ and explain its physical significance.
Appeared in:2082 Bhadra2080 Chaitra2077 Magh
#3Repeated 3 Times[8 Marks]Conduction and Breakdown in Gaseous Dielectrics
Explain the Streamer (Kanal) mechanism of spark breakdown in non-uniform fields and at high $pd$ values. Differentiate between Townsend and Streamer theories.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[6 Marks]Conduction and Breakdown in Gaseous Dielectrics
Describe the breakdown characteristics of electronegative gases. Why is Sulphur Hexafluoride (SF6) widely used in high-voltage circuit breakers and GIS?
Appeared in:2081 Chaitra2079 Baishakh2076 Baishakh
#5Repeated 3 Times[8 Marks]Conduction and Breakdown in Gaseous Dielectrics
Explain Corona discharge in high voltage transmission lines. Derive Peek's formula for visual critical voltage and power loss due to corona.
Appeared in:2081 Baishakh2078 Chaitra2075 Bhadra

Breakdown in Liquid and Solid Dielectrics

5 Questions
#1Repeated 3 Times[8 Marks]Breakdown in Liquid and Solid Dielectrics
Discuss breakdown mechanisms in pure and commercial liquid dielectrics: Suspended particle theory, Cavitation and bubble theory, and Stressed oil volume theory.
Appeared in:2083 Baishakh2081 Bhadra2078 Chaitra
#2Repeated 3 Times[8 Marks]Breakdown in Liquid and Solid Dielectrics
Explain testing and treatment of transformer oil (dielectric strength, moisture content, dissolved gas analysis - DGA, and acidity test according to IEC 60156).
Appeared in:2082 Bhadra2080 Chaitra2077 Chaitra
#3Repeated 3 Times[8 Marks]Breakdown in Liquid and Solid Dielectrics
Describe intrinsic breakdown, electromechanical breakdown, and thermal breakdown mechanisms in solid insulating materials.
Appeared in:2082 Chaitra2079 Chaitra2076 Chaitra
#4Repeated 3 Times[6 Marks]Breakdown in Liquid and Solid Dielectrics
Explain electrical treeing and water treeing degradation mechanisms in solid polymeric insulation (cross-linked polyethylene - XLPE).
Appeared in:2081 Bhadra2078 Bhadra2075 Chaitra
#5Repeated 3 Times[8 Marks]Breakdown in Liquid and Solid Dielectrics
Discuss partial discharge (PD) phenomenon in solid insulation voids. Describe the straight detection method for PD measurement.
Appeared in:2083 Baishakh2080 Baishakh2077 Magh

Generation of High DC, AC, and Impulse Voltages

6 Questions
#1Repeated 3 Times[8 Marks]Generation of High DC, AC, and Impulse Voltages
Explain the working of Cockcroft-Walton voltage multiplier circuit for generating high DC voltages. Derive expressions for voltage ripple $\delta V$ and total voltage drop $\Delta V$.
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra
#2Repeated 3 Times[6 Marks]Generation of High DC, AC, and Impulse Voltages
Describe the electrostatic Van de Graaff generator: Construction, principle of charge spray, belt transport, and maximum potential limit.
Appeared in:2082 Bhadra2080 Chaitra2077 Chaitra
#3Repeated 3 Times[8 Marks]Generation of High DC, AC, and Impulse Voltages
Explain cascading of testing transformers to generate high AC voltages. Discuss why insulation grading and tertiary windings are essential.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[8 Marks]Generation of High DC, AC, and Impulse Voltages
Explain series resonant circuits for high-voltage AC testing of capacitive loads (cables, GIS). State advantages over conventional testing transformers.
Appeared in:2081 Chaitra2078 Chaitra2076 Baishakh
#5Repeated 3 Times[8 Marks]Generation of High DC, AC, and Impulse Voltages
Define standard lightning impulse waveform (1.2/50 $\mu\text{s}$) and switching impulse waveform (250/2500 $\mu\text{s}$). Derive wavefront time $t_1$ and wave tail time $t_2$.
Appeared in:2081 Baishakh2079 Baishakh2075 Bhadra
#6Repeated 3 Times[8 Marks]Generation of High DC, AC, and Impulse Voltages
Explain the multi-stage Marx generator circuit for producing high impulse voltages. Calculate stage capacitances and damping resistances for given wave parameters.
Appeared in:2083 Baishakh2080 Chaitra2078 Bhadra

Measurement of High Voltages and High Currents

5 Questions
#1Repeated 3 Times[8 Marks]Measurement of High Voltages and High Currents
Explain sphere-gap method for high voltage peak measurement according to IEC 60052. Discuss factors affecting sphere-gap breakdown (air density, irradiation, polarity).
Appeared in:2082 Bhadra2081 Baishakh2077 Magh
#2Repeated 3 Times[8 Marks]Measurement of High Voltages and High Currents
Design resistance potential dividers and capacitance potential dividers for measuring high DC and impulse voltages. Discuss frequency response and stray capacitance effects.
Appeared in:2082 Chaitra2079 Chaitra2076 Chaitra
#3Repeated 3 Times[6 Marks]Measurement of High Voltages and High Currents
Describe electrostatic voltmeters for measuring high DC and AC voltages: Operating principle, force between electrodes, and range extension.
Appeared in:2081 Bhadra2078 Chaitra2075 Chaitra
#4Repeated 3 Times[6 Marks]Measurement of High Voltages and High Currents
Explain the generating voltmeter for high DC voltage measurement without drawing any resistive current from the source.
Appeared in:2083 Baishakh2080 Baishakh2077 Chaitra
#5Repeated 3 Times[8 Marks]Measurement of High Voltages and High Currents
Describe high impulse current measurement using Rogowski coils and low-inductance resistive shunts.
Appeared in:2081 Chaitra2079 Baishakh2076 Baishakh

Overvoltage Transients and Insulation Coordination

5 Questions
#1Repeated 3 Times[8 Marks]Overvoltage Transients and Insulation Coordination
Explain origin and characteristics of internal switching overvoltages (line energization, load rejection, interruption of inductive/capacitive currents).
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra
#2Repeated 3 Times[6 Marks]Overvoltage Transients and Insulation Coordination
Describe lightning phenomena: Cloud charge generation, stepped leader, dart leader, and return stroke mechanism.
Appeared in:2082 Bhadra2080 Chaitra2077 Chaitra
#3Repeated 3 Times[8 Marks]Overvoltage Transients and Insulation Coordination
Explain metal oxide surge arresters (ZnO gapless arresters): V-I non-linear characteristics, energy absorption capability, and residual voltage.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[8 Marks]Overvoltage Transients and Insulation Coordination
Define Basic Impulse Insulation Level (BIL) and Basic Switching Impulse Level (BSL). Explain principles of insulation coordination in substations according to IEC 60071.
Appeared in:2081 Baishakh2078 Chaitra2075 Bhadra
#5Repeated 3 Times[8 Marks]Overvoltage Transients and Insulation Coordination
Analyze traveling waves on transmission lines: Derive surge impedance $Z_0 = \sqrt{L/C}$ and surge velocity $v = 1/\sqrt{LC}$. Calculate reflection and refraction coefficients at an open-circuited line termination.
Appeared in:2081 Chaitra2079 Baishakh2076 Chaitra

High Voltage Testing of Electrical Apparatus

4 Questions
#1Repeated 3 Times[8 Marks]High Voltage Testing of Electrical Apparatus
Describe high voltage testing of power transformers: Power frequency withstand test, induced overvoltage test, and impulse voltage test.
Appeared in:2083 Baishakh2080 Chaitra2078 Bhadra
#2Repeated 3 Times[8 Marks]High Voltage Testing of Electrical Apparatus
Explain testing procedures for outdoor porcelain and composite pin/suspension insulators: 1-minute dry withstand test, wet withstand test, and 50% impulse flashover test.
Appeared in:2082 Bhadra2081 Baishakh2077 Magh
#3Repeated 3 Times[8 Marks]High Voltage Testing of Electrical Apparatus
Describe high voltage testing of power cables: Conductor resistance, dielectric loss angle ($\tan \delta$) test using Schering bridge, and partial discharge test.
Appeared in:2082 Chaitra2079 Chaitra2076 Baishakh
#4Repeated 3 Times[8 Marks]High Voltage Testing of Electrical Apparatus
Explain testing of high voltage circuit breakers: Short-circuit breaking capacity, transient recovery voltage (TRV), and synthetic testing methods.
Appeared in:2081 Bhadra2078 Chaitra2075 Chaitra

Curriculum Syllabus & Course Topics

Sourced from TU curriculum portal
Full Syllabus (PDF)
Chapter-wise Units & Micro-Syllabus Topics (6 Units)

  1. 1. Conduction and Breakdown in Gaseous Dielectrics

    8

  2. 2. Breakdown in Liquid and Solid Dielectrics

    6

  3. 3. Generation of High DC, AC, and Impulse Voltages

    10

  4. 4. Measurement of High Voltages and High Currents

    7

  5. 5. Overvoltage Transients and Insulation Coordination

    8

  6. 6. High Voltage Testing of Electrical Apparatus

    6

Examination Scheme & Marks Distribution

Evaluation Structure

  • Final Board Theory Exam: 60 Marks (Pass mark: 24)
  • Internal Assessment: 40 Marks (Pass mark: 16)
  • Practical / Lab Exam: 25 or 50 Marks (Continuous lab evaluation + viva, where applicable)

* This is the general current IOE 60/40 scheme; verify course-specific details in the syllabus above.

Exam Preparation Guidelines

  • Review the available past examination paper to understand question styling, typical derivation topics, and marks allocation.
  • Cross-reference key answers with official syllabus units, standard textbooks, and lecture notes.
  • Structure answers with labeled diagrams, concise bullet points, and highlight final answers in numerical solutions.

Frequently Asked Questions (High Voltage Engineering)

Q: How can I download High Voltage Engineering past question papers?

You can preview or download the High Voltage Engineering question papers (PDF) directly using the built-in viewer on this page with zero redirects or paywalls.

Q: What is the pass mark for High Voltage Engineering?

The general current scheme is a 60-mark final theory exam and a 40-mark internal assessment, with pass marks of 24 and 16. Verify the course-specific syllabus above.

Q: Where can I find the complete syllabus for this subject?

The available chapter-wise syllabus and topic breakdown is indexed in the Syllabus section above, with links to the curriculum PDF source.

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