EE6401 Electrical Machines-I Previous Year Question Papers


EE6401 Electrical Machines-I Previous Year Question Papers


B.E – Electrical and Electronics Engineering, Second Year 4th Semester EE6401 Electrical Machines-I Previous Year Question Papers For The Regulation 2013.

(Note:  This Is The Only Site, Where You Can Download The Previous Year Anna University Question Papers In PDF Format With Good Quality And With Out Any Water Marks.

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OBJECTIVES:
  • To introduce techniques of magnetic-circuit analysis and introduce magnetic materials
  • To familiarize the constructional details, the principle of operation, prediction of performance, the methods of testing the transformers and three-phase transformer connections.
  • To study the working principles of electrical machines using the concepts of electromechanical energy conversion principles and derive expressions for generated voltage and torque developed in all Electrical Machines.
  • To study the working principles of DC machines as Generator types, determination of their no-load/load characteristics, starting and methods of speed control of motors.
  • To estimate the various losses taking place in D.C. Motor and to study the different testing methods to arrive at their performance.
UNIT I – MAGNETIC CIRCUITS AND MAGNETIC MATERIALS
Magnetic circuits –Laws governing magnetic circuits – Flux linkage, Inductance, and energy – Statically and Dynamically induced EMF – Torque – Properties of magnetic materials, Hysteresis and Eddy Current losses – AC excitation, introduction to permanent magnets-Transformer as a magnetically coupled circuit.
UNIT II – TRANSFORMERS
Construction – principle of operation – equivalent circuit parameters – phasor diagrams, losses – testing – efficiency and voltage regulation-all day efficiency-Sumpner’s test, per unit representation – inrush current – three-phase transformers-connections – Scott Connection – Phasing of a transformer– parallel operation of three-phase transformers-auto transformer – tap changing transformers- tertiary winding.
UNIT III – ELECTROMECHANICAL ENERGY CONVERSION AND CONCEPTS IN ROTATING MACHINES
Energy in a magnetic system – Field energy and coenergy-force and torque equations – singly and multiply excited magnetic field systems-MMF of distributed windings – Winding Inductances-, magnetic fields in rotating machines – rotating MMF waves – magnetic saturation and leakage fluxes.
UNIT IV – DC GENERATORS
Construction and components of DC Machine – Principle of operation – Lap and wave windings-EMF equations– circuit model – armature reaction –methods of excitation-commutation and interpoles – compensating winding –characteristics of DC generators.
UNIT V – DC MOTORS
Principle and operations – types of DC Motors – Speed Torque Characteristics of DC Motors-starting and speed control of DC motors –Plugging, dynamic and regenerative braking- testing and efficiency – Retardation test- Swinburne’s test and Hopkinson’s test – Permanent magnet dc motors(PMDC)-DC Motor applications.
 

EE6401 Electrical Machines-I Previous Year Question Papers for the Regulation 2013



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