Electrical Machines-II SPPU Insem Question Paper Aug 2025
All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.
- Subject code
- 303143
- Pattern
- 2019 pattern
- Exam
- Insem
- Session
- Aug 2025
- Max. marks
- 30
- Time
- 1 Hour
- Semester
- I
- Paper code
- [6579]-335
Printed for: T.E. (Electrical Engineering) (Insem)
Instructions to the candidates
- Solve Q.1 or Q.2 and Q.3 or Q.4.
- Figures to the right indicate full marks.
- Neat diagrams must be drawn wherever necessary.
- Assume suitable data, if necessary.
- Use of non-programmable calculator is allowed.
Questions
Q1
- a)[7]
Compare the salient pole rotor construction with non salient pole rotor construction in case of synchronous machine. (any 7 points)
Also asked:Oct 2023
- b)[8]
A 3-ph, 6 pole, 1000 rpm star connected alternator has double layer armature winding with 72 coils, each coil has 40 turns & coil span is 150º Elect. The flux per pole is 16 mWb. Calculate i) emf generated per phase & ii) terminal voltage EL
OR- a)
Q2
- a)[7]
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.
Also asked:Oct 2023
- b)[8]
Draw the phasor diagram of salient pole alternator at lagging power factor & based on it, write the formula for direct axis current (Id), quadrature axis current (Iq), excitation emf (Ef) and voltage regulation.
- a)
Q3
- a)[7]
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:Oct 2024
- b)[8]
This part has equations that don’t show as text. Open the PDF to read it.
OR- a)
Q4
- a)[7]
Plot OCC & SCC. Define Short Circuit Ratio in case of 3-ph alternator? Derive the relation between SCR & X d pu.
- b)[8]
This part has equations that don’t show as text. Open the PDF to read it.
- a)