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ENEE 302Bachelor in Electrical Engineering · Semester 51 Paper Available

Electric Machine Design

Past examination question papers and complete curriculum syllabus for Electric Machine Design (ENEE 302), Bachelor in Electrical Engineering Semester 5 under Institute of Engineering (IOE), Tribhuvan University.

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5th-sem_Electric Machine Design.pdf

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Most Frequently Asked Questions

Top recurring IOE board exam questions for Electric Machine Design with verified mark schemes, formula notation, and recurrence frequency.

Showing 30 of 30 top repeated questions

Principles and Limitations of Electrical Machine Design

4 Questions
#1Repeated 3 Times[6 Marks]Principles and Limitations of Electrical Machine Design
Discuss the major principles, design constraints, and modern limitations in electrical machine design with focus on magnetic, electric, and thermal loadings.
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra
#2Repeated 3 Times[8 Marks]Principles and Limitations of Electrical Machine Design
Explain specific magnetic loading ($B_{av}$) and specific electric loading ($q$). Discuss factors influencing their choice in modern machine design.
Appeared in:2082 Bhadra2080 Chaitra2077 Magh
#3Repeated 3 Times[8 Marks]Principles and Limitations of Electrical Machine Design
Derive the output equation of an AC machine in terms of specific magnetic and electric loadings: $Q = C_0 D^2 L n_s$.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[6 Marks]Principles and Limitations of Electrical Machine Design
Differentiate between Class A, B, F, and H insulating materials with their maximum permissible temperature limits according to IEC standards.
Appeared in:2081 Chaitra2079 Baishakh2076 Chaitra

Magnetic Circuit Calculations and Thermal Limits

4 Questions
#1Repeated 3 Times[8 Marks]Magnetic Circuit Calculations and Thermal Limits
Derive expressions for MMF calculation of tapered teeth and air-gap using Carter's coefficient in slotted armatures.
Appeared in:2083 Baishakh2081 Bhadra2078 Chaitra
#2Repeated 3 Times[8 Marks]Magnetic Circuit Calculations and Thermal Limits
Explain the heating and cooling curves of electrical machines. Derive expressions for steady-state temperature rise and thermal time constant $\tau$.
Appeared in:2082 Bhadra2080 Chaitra2077 Chaitra
#3Repeated 3 Times[6 Marks]Magnetic Circuit Calculations and Thermal Limits
Explain methods of cooling large turbo-generators and transformers. Compare air, hydrogen, and direct water cooling systems.
Appeared in:2082 Chaitra2079 Baishakh2075 Bhadra
#4Repeated 3 Times[8 Marks]Magnetic Circuit Calculations and Thermal Limits
Calculate real and apparent flux densities in slotted armature teeth when operating at high saturation levels.
Appeared in:2081 Baishakh2078 Bhadra2076 Baishakh

Design of Single-Phase and Three-Phase Transformers

6 Questions
#1Repeated 3 Times[8 Marks]Design of Single-Phase and Three-Phase Transformers
Derive the output equation of single-phase and three-phase core-type power transformers: $Q = 2.22 f B_m A_i A_w K_w J \times 10^{-3}$ kVA.
Appeared in:2083 Baishakh2080 Chaitra2078 Bhadra
#2Repeated 3 Times[8 Marks]Design of Single-Phase and Three-Phase Transformers
Explain the step-by-step procedure for designing core, window dimensions, and yoke for a 3-phase, 11 kV/400 V distribution transformer.
Appeared in:2082 Bhadra2081 Baishakh2077 Magh
#3Repeated 3 Times[8 Marks]Design of Single-Phase and Three-Phase Transformers
Prove that for minimum total active material cost in a transformer, cost of iron should equal cost of copper times a factor depending on unit material prices.
Appeared in:2082 Chaitra2079 Chaitra2076 Chaitra
#4Repeated 3 Times[8 Marks]Design of Single-Phase and Three-Phase Transformers
Design the low-voltage (LV) and high-voltage (HV) helical or disc windings of a 500 kVA transformer, calculating conductor size, turns, and insulation thickness.
Appeared in:2081 Bhadra2078 Chaitra2075 Chaitra
#5Repeated 3 Times[8 Marks]Design of Single-Phase and Three-Phase Transformers
Derive the expression for leakage reactance in concentric cylindrical transformer windings in terms of geometric dimensions and turns.
Appeared in:2083 Baishakh2080 Baishakh2077 Chaitra
#6Repeated 3 Times[8 Marks]Design of Single-Phase and Three-Phase Transformers
Design cooling tubes and calculate the number of radiator tubes required for a 1000 kVA oil-immersed distribution transformer to keep temperature rise within 45°C.
Appeared in:2081 Chaitra2079 Baishakh2076 Baishakh

Design of Direct Current Machines

5 Questions
#1Repeated 3 Times[8 Marks]Design of Direct Current Machines
Derive the output equation of a DC machine: $P = C_0 D^2 L n$, where $C_0 = \pi^2 B_{av} q \times 10^{-3}$.
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra
#2Repeated 3 Times[6 Marks]Design of Direct Current Machines
Discuss guidelines for selecting number of poles, armature core diameter $D$, and core length $L$ in DC machine design.
Appeared in:2082 Bhadra2080 Chaitra2077 Magh
#3Repeated 3 Times[8 Marks]Design of Direct Current Machines
Design a lap or wave armature winding for a 4-pole DC generator with 28 slots. Draw the developed winding diagram and equalizer ring connections.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[8 Marks]Design of Direct Current Machines
Calculate commutator diameter, length, and number of segments for a 50 kW, 230 V, 1000 rpm DC motor ensuring sparkless commutation.
Appeared in:2081 Chaitra2078 Chaitra2076 Chaitra
#5Repeated 3 Times[8 Marks]Design of Direct Current Machines
Design the shunt field winding of a DC shunt motor, including calculation of turns per pole, conductor size, and field resistance.
Appeared in:2081 Baishakh2079 Baishakh2075 Bhadra

Design of Three-Phase Induction Motors

6 Questions
#1Repeated 3 Times[8 Marks]Design of Three-Phase Induction Motors
Derive the main dimensions ($D$ and $L$) of a 3-phase, 415 V, 50 Hz, 4-pole squirrel-cage induction motor for a given rating using empirical relationships.
Appeared in:2083 Baishakh2081 Bhadra2078 Chaitra
#2Repeated 3 Times[6 Marks]Design of Three-Phase Induction Motors
Explain criteria for choosing the air-gap length in 3-phase induction motors. What are the adverse effects of having too small or too large an air-gap?
Appeared in:2082 Bhadra2080 Chaitra2077 Chaitra
#3Repeated 3 Times[8 Marks]Design of Three-Phase Induction Motors
Design the stator winding, slot dimensions, and coil turns for a 15 kW, 400 V, 50 Hz, 4-pole star-connected induction motor.
Appeared in:2082 Chaitra2079 Chaitra2076 Chaitra
#4Repeated 3 Times[8 Marks]Design of Three-Phase Induction Motors
Design the squirrel-cage rotor (rotor bar area, end-ring dimensions, and slot pitch) to ensure low slip and adequate starting torque.
Appeared in:2081 Bhadra2078 Bhadra2075 Chaitra
#5Repeated 3 Times[8 Marks]Design of Three-Phase Induction Motors
Calculate magnetizing current and no-load power factor of a 3-phase induction motor from its magnetic circuit dimensions.
Appeared in:2083 Baishakh2080 Baishakh2077 Magh
#6Repeated 3 Times[6 Marks]Design of Three-Phase Induction Motors
Explain harmonic torques (crawling and cogging) in induction motors and methods to eliminate them through proper choice of stator and rotor slot combinations.
Appeared in:2081 Chaitra2079 Baishakh2076 Baishakh

Design of Synchronous Machines

5 Questions
#1Repeated 3 Times[8 Marks]Design of Synchronous Machines
Derive the output equation of a 3-phase salient-pole synchronous generator and discuss the choice of $D$ and $L$ for hydro-generators vs turbo-generators.
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra
#2Repeated 3 Times[8 Marks]Design of Synchronous Machines
Define Short Circuit Ratio (SCR) in synchronous machines. Discuss its influence on size, cost, regulation, stability, and parallel operation.
Appeared in:2082 Bhadra2080 Chaitra2077 Chaitra
#3Repeated 3 Times[8 Marks]Design of Synchronous Machines
Design the stator core and winding of a 10 MVA, 11 kV, 50 Hz, 12-pole salient-pole hydro-generator.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[8 Marks]Design of Synchronous Machines
Design the field pole, pole shoes, and damper windings of a salient-pole alternator to minimize waveform distortion.
Appeared in:2081 Baishakh2078 Chaitra2075 Bhadra
#5Repeated 3 Times[6 Marks]Design of Synchronous Machines
Explain the design of cylindrical rotor turbo-alternator end-bells and retaining rings under heavy centrifugal mechanical stresses.
Appeared in:2081 Chaitra2079 Baishakh2076 Chaitra

Curriculum Syllabus & Course Topics

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

  1. 1. Principles and Limitations of Electrical Machine Design

    4

  2. 2. Magnetic Circuit Calculations and Thermal Limits

    6

  3. 3. Design of Single-Phase and Three-Phase Transformers

    10

  4. 4. Design of Direct Current Machines

    8

  5. 5. Design of Three-Phase Induction Motors

    10

  6. 6. Design of Synchronous Machines

    7

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 (Electric Machine Design)

Q: How can I download Electric Machine Design past question papers?

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

Q: What is the pass mark for Electric Machine Design?

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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