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Electrical Machines-II important questionsMost repeated in SPPU papers

These 33 questions appeared in more than one SPPU Electrical Machines-II paper we have: 9 papers, from May 2023 to Nov 2025. The most-asked come first. Each one links to the papers it was asked in.

All Electrical Machines-II papers and notes

Repeated questions

Endsem questions (30)

  1. 6×asked

    Explain inductively compensated A C series motor, with suitable diagram.

    Nov 2025 ·May 2025 ·Nov 2024 ·May 2024 ·Nov 2023 ·May 2023

  2. 6×asked

    State the various methods of speed control of 3-ph induction motor on stator and rotor side.

    Nov 2025 ·May 2025 ·Nov 2024 ·May 2024 ·Nov 2023 ·May 2023

  3. 4×asked

    Compare 3-phase synchronous motor with 3-phase induction motor.

    Nov 2025 ·May 2024 ·Nov 2023 ·May 2023

  4. 4×asked

    Draw the neat construction diagram and explain the working of variable reluctance stepper motor. Show the truth table. How to reverse the direction of rotation.

    Nov 2025 ·May 2024 ·Nov 2023 ·May 2023

  5. 4×asked

    Sketch the torque-slip characteristics of 1-ph Induction motor based on double field revolving theory. Prove, how the 1-ph induction motor is not self-starting by mathematically & graphically.

    Nov 2025 ·May 2024 ·Nov 2023 ·May 2023

  6. 4×asked

    What are the modifications necessary in construction of dc series motor to operate it on ac supply?

    Nov 2025 ·May 2024 ·Nov 2023 ·May 2023

  7. 3×asked

    Draw the approximate phasor diagram of AC series motor & explain.

    Nov 2025 ·May 2024 ·Nov 2023

  8. 3×asked

    Draw the torque - armature current characteristics of AC and DC series motor on common X & Y-axis & comment on armature current & torque.

    Nov 2025 ·May 2024 ·Nov 2023

  9. 3×asked

    What do you mean by universal motor? Draw its speed vs torque characteristics on A C and D C operation. State applications of universal motor.

    Nov 2025 ·May 2025 ·Nov 2024

  10. 3×asked

    What is energy efficient three phase induction motor?

    Nov 2025 ·May 2024 ·Nov 2023

  11. 3×asked

    Calculate step angle & resolution of 3-ph stepper motor with 08 stator poles & 06 rotor poles.

    May 2024 ·Nov 2023 ·May 2023

  12. 3×asked

    With the neat schematic diagram describe the construction and working of PM D.C. motor. State its applications.

    May 2024 ·Nov 2023 ·May 2023

  13. 2×asked

    How to make 1-ph induction motor self-starting?

    Nov 2025 ·May 2024

  14. 2×asked

    Describe with suitable diagram working of permanent magnet D C motor. State its advantages and applications.

    May 2025 ·Nov 2024

  15. 2×asked

    Discuss the modifications necessary in design and construction of D C series motor so that it can work satisfactorily on A C supply as a universal motor. 3

    May 2025 ·Nov 2024

  16. 2×asked

    Draw V curve of synchronous motor. Show under excitation, over excitation and critical excitation regions in it.

    May 2025 ·Nov 2024

  17. 2×asked

    Explain operation of three phase induction motor as an induction generator. State its advantages and applications.

    May 2025 ·Nov 2024

  18. 2×asked

    Explain the following terms related to loading of 3 phase synchronous motor i) load angle or torque angle ii) Internal angle iii) power factor angle. Show these angles by drawing relevant phasor diagram at lagging power factor.

    May 2025 ·Nov 2024

  19. 2×asked

    Explain with relevant phasor diagrams the operation of synchronous motor at constant load and variable excitation condition.

    May 2025 ·Nov 2024

  20. 2×asked

    What is energy efficient Induction Motor? State its any two features.

    May 2025 ·Nov 2024

  21. 2×asked

    With suitable diagram explain blocked rotor test performed on single phase capacitor start induction motor. Draw its equivalent circuit under blocked rotor conditions.

    May 2025 ·Nov 2024

  22. 2×asked

    A 2300 V three phase star connected synchronous motor has armature resistance of 0.2 ohm/ph. and synchronous reactance of 2.0 ohm/ph. The motor is operated at 0.5 leading power factor and takes a current of 180 A from supply. Calculate back EMF generated in the motor & load angle  .

    May 2024 ·Nov 2023

  23. 2×asked

    Draw the equivalent circuit diagram of 3 phase synchronous motor & state, why it is called doubly fed motor?

    May 2024 ·Nov 2023

  24. 2×asked

    Draw the equivalent circuit of 1 –ph induction motor for no load and blocked rotor test . Write the necessary formulae used.

    May 2024 ·Nov 2023

  25. 2×asked

    Sketch V and inverted V curves of synchronous motor and show the power factor regions.

    May 2024 ·Nov 2023

  26. 2×asked

    State the types of 1-ph induction motors. Write applications of capacitor start lM.

    May 2024 ·Nov 2023

  27. 2×asked

    What is hunting in synchronous motor? How to minimise it? Explain.

    May 2024 ·Nov 2023

  28. 2×asked

    A 75 kW, 440 V, three phase star connected 50 Hz, synchronous motor has Zs = 0.04 + j0.4  /ph & operates at 0.8 leading power factor. The motor efficiency is 92.5 %. Calculate : i) armature current ii) back emf and iii) mechanical power developed in armature Pm.

    Nov 2023 ·May 2023

  29. 2×asked

    Draw the phasor diagram of 3 phase synchronous motor for lagging power factor & show i) Load angle ii) Internal angle iii) Power factor angle on it iv) Write the formula for back emf from phasor diagram.

    Nov 2023 ·May 2023

  30. 2×asked

    How to reverse the direction of rotation of 1-ph induction motor, explain by connection diagram.

    Nov 2023 ·May 2023

Insem questions (3)

  1. 2×asked

    Compare the salient pole rotor construction with non salient pole rotor construction in case of synchronous machine. (any 7 points)

    Aug 2025 ·Oct 2023

  2. 2×asked

    Sketch the OCC and SCC of alternator & write down the steps to determination of voltage regulation of 3-ph alternator at lagging power factor by MMF method analytically. Assume Ra = 0.

    Aug 2025 ·Oct 2024

  3. 2×asked

    What is armature reaction in case of 3 phase synchronous machine? Elaborate its effect at zero leading power factor with the help of neat waveform and phasor diagram.

    Aug 2025 ·Oct 2023

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.