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Electrical Machines-1 important questionsMost repeated in SPPU papers

These 14 questions appeared in more than one SPPU Electrical Machines-1 paper we have: 8 papers, from Mar 2023 to Mar 2026. The most-asked come first. Each one links to the papers it was asked in.

All Electrical Machines-1 papers and notes

Repeated questions

Endsem questions (11)

  1. 4×asked

    Draw and explain the following characteristics of the DC series Motor: i) Torque vs. armature current ii) Speed vs. armature current iii) Speed vs. torque

    Nov 2025 ·May 2025 ·May 2024 ·Nov 2023

  2. 3×asked

    State the types of starters used for induction motors. Explain the DOL starter with a suitable diagram.

    Nov 2025 ·May 2025 ·Nov 2023

  3. 3×asked

    Sketch the circuit diagram & explain the methods of speed control of DC series motor by flux control.

    May 2025 ·May 2024 ·Nov 2023

  4. 2×asked

    What is the necessity of the starter in a DC motor? Explain with a neat labeled sketch the working of a three-point starter.

    Nov 2025 ·Nov 2024

  5. 2×asked

    Draw the connection diagram of 3 point starter used for DC shunt motor & explain the function of i) Hold on coil & ii) Over load coil

    May 2025 ·May 2024

  6. 2×asked

    Draw the connection diagram of star-delta starter & explain the starting and running operation of 3-ph induction motor.

    May 2025 ·May 2024

  7. 2×asked

    Draw the power flow diagram of 3-ph Induction motor.

    May 2025 ·Nov 2023

  8. 2×asked

    Obtain the torque equation of induction motor under running condition & there of derive the condition of maximum torque.

    May 2025 ·May 2024

  9. 2×asked

    Sketch the family of torque-slip characteristics of 3-ph induction motor & explain i) operating region ii) maximum torque & iii) when slip is one

    May 2025 ·May 2024

  10. 2×asked

    A 500V, 6pole DC shunt motor have armature & field winding resistance of 0.5ohm and 250ohm respectively. It draws a full load current of 20A from supply. If the rotational losses are 900W, calculate efficiency of motor.

    Nov 2024 ·Nov 2023

  11. 2×asked

    Derive Torque equation of DC motor with usual notation. Write Voltage and Current equation of DC shunt motor.

    Nov 2024 ·May 2024

Insem questions (3)

  1. 3×asked

    With the neat sketch and phasor diagram explain the V-V connection of the transformer.

    Mar 2026 ·Mar 2025 ·Mar 2023

  2. 2×asked

    State the necessity of parallel operation of the transformer. State any four necessary conditions for satisfactory parallel operation of the transformer. 

    Mar 2026 ·Mar 2025

  3. 2×asked

    Two single phase transformers with equal voltage ratios have impedances of (0.82+ j 2.51) ohms and (0.8+j 2.31) ohms with respect to the secondary. If they operate in parallel, how they will share a total load of 2000 KW at power factor 0.8 lagging?

    Mar 2025 ·Mar 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.