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EndsemMay 20242019 patternTE Electrical

Electrical Machines-II SPPU Endsem Question Paper May 2024

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Electrical Machines-II questions
Subject code
303143
Pattern
2019 pattern
Exam
Endsem
Session
May 2024
Max. marks
70
Time
2½ Hours
Semester
I
Paper code
[6262]-64

Printed for: T.E. (Electrical Engineering)

Instructions to the candidates

  1. Solve Q1 or Q2; Q3 or Q4; Q5 or Q6; Q7or Q8.
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherever necessary.
  4. Assume suitable additional data, if necessary.
  5. Use of non-programmable calculator is allowed.

Questions

  1. Q1

    1. a)

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

      Also asked:Nov 2023

      [4]
    2. b)

      What is significance of load angle  ? With neat sketch, explain it for NO losses & with losses.

      [6]
    3. c)

      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  .

      Also asked:Nov 2023

      [8]

  2. Q2

    1. a)

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

      Also asked:Nov 2023

      [4]
    2. b)

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

      Also asked:Nov 2023

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]

  3. Q3

    1. a)

      State the methods of speed control of 3 phase Induction motor on stator & rotor side.

      Also asked:Nov 2025 ·May 2025 ·Nov 2024 ·Nov 2023 ·May 2023

      [3]
    2. b)

      Draw the block diagram & explain the V/f method of speed control of 3 phase induction motor.

      Also asked:Nov 2025 ·May 2025 ·Nov 2024 ·Nov 2023 ·May 2023

      [6]
    3. c)

      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.

      Also asked:Nov 2025 ·Nov 2023 ·May 2023

      [8]

  4. Q4

    1. a)

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

      Also asked:Nov 2023 ·May 2023

      [3]
    2. b)

      What is the Energy Efficient three phase Induction Motor? How to achieve it?

      Also asked:Nov 2025 ·Nov 2023

      [6]
    3. c)

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

      Also asked:Nov 2023 ·May 2023

      [8]

  5. Q5

    1. a)

      Draw the torque –armature current characteristics of AC and DC series motor & comment on armature current & torque.

      Also asked:Nov 2025 ·Nov 2023

      [4]
    2. b)

      Compare the performance of universal motor on AC & DC supply.

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]

  6. Q6

    1. a)

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

      Also asked:Nov 2025 ·Nov 2023 ·May 2023

      [4]
    2. b)

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

      Also asked:Nov 2025 ·Nov 2023

      [6]
    3. c)

      Compare conductively compensated and inductively compensated series motor. 3

      Also asked:Nov 2025 ·May 2025 ·Nov 2024 ·Nov 2023 ·May 2023

      [8]

  7. Q7

    1. a)

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

      Also asked:Nov 2023

      [3]
    2. b)

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

      Also asked:Nov 2023

      [6]
    3. c)

      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.

      Also asked:Nov 2025 ·Nov 2023 ·May 2023

      [8]

  8. Q8

    1. a)

      What are the necessary conditions to make 1–ph induction motor self- starting?

      Also asked:Nov 2025

      [3]
    2. b)

      Compare single phase motor with 3 phase induction motor.

      Also asked:Nov 2025 ·Nov 2023 ·May 2023

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]