EE6401 Electrical Machines – I Important Questions

Unit 1

 Magnetic circuits

 Flux linkage, Inductance and energy

 Torque

 Properties of magnetic materials

 Hysterisis and Eddy Current losses

 Transformer as a magnetically coupled circuit

Unit 2

 Equivalent circuit parameters

 Phasor diagrams

 Sumpner's test, per unit representation

 Inrush current

 Three phase transformers-connections

 Scott Connection

 Tap changing transformers

 Tertiary winding

Unit 3

 Energy In Magnetic System

 Force And Torque Equations

 Winding Inductances

 Rotating Mmf Waves

 Magnetic Saturation And Leakage Fluxes

Unit 4

 Construction and components of DC Machine

 EMF equations

 Circuit Model

 Armature Reaction

 Commutation And Interpoles

 Characteristics of DC generators

Unit 5

 UJT saw tooth waveform generator

 Types of DC Motors

 Speed Torque Characteristics of DC Motors

 Plugging

 dynamic and regenerative braking

 Permanent magnet dc motors(PMDC)

 DC Motor applications

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