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2019 B.E Electrical Engineering B.E Jadavpur University Electrical Engineering- Electrical Machines (2nd Year First Semester) -2019 Question paper



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

Confused about from where to get the original question papers of 2019 for Electrical Engineering- Electrical Machines (2nd Year First Semester) in Jadavpur University? Don't need to get worried. We have just provided that.



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B.E Electrical Engineering 2nd year, 1st Semester - 2019
Electrical Machines

Maximum Marks - 100
Total Time - 3 Hours

Syllabus

PART – I
General introduction to electrical machines : Faraday's laws of electromagnetic
induction, Fleming's rule and Lenz's Law. Principle of operation of generators and
motors. Space distribution of flux density and time variation of voltage. Flux wave in dc
and ac machines. Magnetic curves and their relevance.
DC Machines : Detailed construction and operating principle. Materials used for D.C.
machines. Function of commutator and brush system. Induced emf in dc machine.
Separate, Shunt, Series and Compound excitation. Losses and efficiency. Voltage build
up of dc shunt generator. DC motoring action. Torque developed in dc motor.
Armature windings, Equalisers. Armature reaction & its effects, mmf distribution,
compensating windings, Interpoles, Laminated yoke construction. Commutation,
sparking, brushes, interface film.
DC Generators – Characteristics with different excitation systems, voltage regulation,
parallel operation.
DC Motors – Characteristics and applications of Separate, Shunt, Series and
Compound motors, methods of starting, speed control, equivalent circuit. Series-parallel
operation of motors.
Introduction to Permanent Magnet dc machines.
Testing of dc machines – Swinburne test, Hopkinson's test, Brake test. Tests
specified as per standards.
PART – II
1-phase Transformers : Construction and basic principle of operation. Core type and
shell type. Materials used for core, winding and insulation. EMF equation. Core loss,
copper loss and Leakage reactances. Harmonics in magnetizing current and
magnetizing in-rush current. Generalised derivation of electrical equivalent circuit from
magnetic structure. Equivalent circuit referred to primary. Phasor diagram. Parallel
operation. Effects of changes of frequency and voltage on transformer performance.
Dry-type and oil cooled type. Natural and forced types of cooling. Tank and radiator
construction, operation. Transformer oil. Transformer accessories, eg., conservator,
breather, Bucholtz relay, bushing, etc.
Power and Distribution Transformers, all-day efficiency.
Testing of transformers : Polarity of windings, OC and SC test, separation of losses,
determination of equivalent circuit parameters. Regulation, efficiency,
Single phase auto-transformers, principle of operation, phasor diagram. Comparison of
weight, copper loss equivalent reactance with 2-winding transformer.
Special Transformers : Current transformers, Pulse Transformers.



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