B.E Jadavpur University Electrical Engineering -Electrical Machines III (3rd Year First Semester) -2019 model question papers



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Posted Date: 08 Mar 2020      Posted By:: Shouvik Maj    Member Level: Silver  Points: 3 (₹ 3)

2019 B.E Electrical Engineering B.E Jadavpur University Electrical Engineering -Electrical Machines III (3rd Year First Semester) -2019 Question paper



Course: B.E Electrical Engineering   University/board: Jadavpur University

Are you looking for the old question papers of Jadavpur University Computer Science & Engineering - Electrical Machines III ? Here is the previous year question paper from Jadavpur University. This is the original question paper from the Electrical Engineering Department for Third year first semester exam conducted by Jadavpur University in year 2019. Feel free to download the question paper from here and use it to prepare for your upcoming exams.



{Scroll Below to get the PDF Attachment file of the Original Question Paper}

Exam Name- B.E Electrical Engineering Exam
3rd Year- 1st Semester

Subject- Electrical Machines III

Total Time- Three Hours
Maximum Marks- 100

Syllabus

PART – I
Single-phase induction motors: Construction and operating principle of split-phase
and capacitor-start-capacitor-run 1-phase induction motors. Operating characteristics.
Construction and operating principle of capacitor-start-induction-run induction motors.
Winding of 1-phase induction motor. Operating characteristics. Double revolving field
theory, Cross field theory. Equivalent circuit, phasor diagram.
Shaded-pole type motor : Construction and operating principle. Operating
characteristics.
Repulsion start 1-phase induction motor : Operating principle. Operating characteristics.
AC Commutator motors : Transformer and rotational emf's in phase and commutator
windings. Expression for torque and power. Action of commutator as frequency
converter. Study of the AC Plain Series motor, its phasor diagram, commutation, brush
emf's, design features. Use of compensating and compole winding to improve power
factor and commutation.
PART – II
Synchronous generator : Stator construction, Cylindrical rotor and salient rotor
construction. Principle of operation. Armature reaction, its effect on load power factor.
Alternator regulation. Synchronous reactance. Prediction of regulation by various
methods. Two-reaction Theory. Damper windings. Short circuit, Transient and subtransient reactances. Determination of Xs, Xd, Xq, X1, X2, X0, Xd', Xq', Xd", Xq". Methods
of voltage control and schemes for excitation systems.
Synchronisation of alternators, power flow, power angle characteristics, operating
chart, synchronizing power, stability. Excitation characteristics, V-curves, parallel
operation.
Synchronous motors : Power developed, circle diagrams for constant power
developed and constant excitation. V-curves and O-curves. Starting methods.
Synchronous induction motor. Operation as synchronous condenser.



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