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InsemMar 20232019 patternSE Electrical

Electrical Machines-1 SPPU Insem Question Paper Mar 2023

All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Electrical Machines-1 questions
Subject code
203146
Pattern
2019 pattern
Exam
Insem
Session
Mar 2023
Max. marks
30
Time
1 Hour
Semester
II
Paper code
[6008]-213

Printed for: S.E. (Electrical Engineering) (In-Sem.)

Instructions to the candidates

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

Questions

  1. Q1

    1. a)

      Write mathematical expression for the losses in case of transformer. State the condition for maximum efficiency of transformer.

      [3]
    2. b)

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

      [6]
    3. c)

      Give any 3 points of comparison between autotransformer and normal transformer.

      [6]

  2. Q2

    1. a)

      State the expression of voltage regulation of transformer in terms of all voltage drops. State any two factors affecting voltage regulation of transformer.

      [3]
    2. b)

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

      [6]
    3. c)

      Draw phasor diagram of transformer for leading power factor condition. Mark all parameters in the phasor diagram. 2

      [6]

  3. Q3

    1. a)

      State one application of each for following connections of transformer - i) Y-Y Connection ii) Y - Delta connection iii) Delta –Y Connection.

      [3]
    2. b)

      With suitable circuit diagram and phasor diagram explain Scott connection of transformer.

      Also asked:Mar 2026 ·Mar 2025

      [6]
    3. c)

      State the necessity of polarity test for transformer. Draw circuit diagram of polarity test on single phase transformer.

      [6]

  4. Q4

    1. a)

      State any three advantages of V-V Connection.

      [3]
    2. b)

      Two 1-Phase transformers have equal turns. Their impedances are (0.5+j3) Ohm and (0.6+j10) Ohm with respect to the secondary. If they operate in parallel, determine how they will share a total load of 100 kW at p.f. 0.8 lagging?

      Also asked:Mar 2025

      [6]
    3. c)

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

      [6]