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InsemOct 20242019 patternTE Electrical

Electrical Machines-II SPPU Insem Question Paper Oct 2024

All 4 questions from this SPPU insem 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
Insem
Session
Oct 2024
Max. marks
30
Time
1 Hour
Semester
I
Paper code
[6360]-35

Printed for: T.E. (Electrical Engineering) (Insem)

Instructions to the candidates

  1. Solve Q1 or Q2, Q3 or Q4.
  2. Neat Diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Use of electronic pocket calculator is allowed.
  5. Assume suitable data if necessary.

Questions

  1. Q1

    1. a)

      Why rotating field & stationary armature type of construction is preferred for 3-ph alternator.

      [7]
    2. b)

      Calculate the no load emf of a star connected 3-ph , 6 pole alternator which is driven at 1200 rpm having flux per pole 0.12 Wb. The armature has 54 slots and double layer winding. Each coil has 10 turns & coil is short chorded by two slots.

      [8]

  2. Q2

    1. a)

      Draw the circuit diagram & explain the procedure to conduct slip test on salient pole 3-ph alternator to determine voltage regulation. Write the necessary formulae.

      [7]
    2. b)

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

      [8]

  3. Q3

    1. a)

      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.

      Also asked:Aug 2025

      [7]
    2. b)

      A 2000 kVA, 2300V, 3-ph star connected alternator has armature resistance of 0.06  per phase. A field current 60 A, produces armature current of 600A and no load line emf of 900 V. Calculate (i) full load voltage regulation at 0.8 p.f lagging & (ii) power angle  .

      [8]

  4. Q4

    1. a)

      Define & explain the short circuit ratio using OCC & SCC plots. Comment on voltage regulation for (i) for higher value of SCR (ii) lower value of SCR.

      [7]
    2. b)

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

      [8]