EE 3405 Electrical Machines - II question papers

Question papers

• November/December 2024

  Question paper code 41035

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• April/May 2024

  Question paper code 51014

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• November/December 2023

  Question paper code 20981

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• April/May 2023

  Question paper code 30154

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Syllabus

1. Unit 1: Synchronous Generator9 hours

   Constructional details · Types of rotors · winding factors · EMF equation · Synchronous reactance · Armature reaction · Phasor diagrams of non-salient pole synchronous generator connected to infinite bus · Synchronizing and parallel operation · Synchronizing torque · Change of excitation and mechanical input · Voltage regulation · EMF, MMF, ZPF and A.S.A method · steady state power-angle characteristics · Two reaction theory · slip test · short circuit transients · Capability Curves

2. Unit 2: Synchronous Motor9 hours

   Principle of operation · Torque equation · Operation on infinite bus bars · V and Inverted V curves · Power input and power developed equations · Starting methods · Current loci for constant power input, constant excitation and constant power Developed · Hunting · natural frequency of oscillations · damper windings · synchronous condenser

3. Unit 3: Three Phase Induction Motor9 hours

   Constructional details · Types of rotors · Principle of operation · Slip · cogging and crawling · Equivalent circuit · Torque-Slip characteristics · Condition for maximum torque · Losses and efficiency · Load test · No load and blocked rotor tests · Circle diagram · Separation of losses · Double cage induction motors · Induction generators · Synchronous induction motor

4. Unit 4: Starting and Speed Control of Three Phase Induction Motor9 hours

   Need for starting · Types of starters · DOL, Rotor resistance, Autotransformer and Star delta starters · Speed control · Voltage control, Frequency control and pole changing · Cascaded Connection · V/f control · Slip power recovery Scheme · Braking of three phase induction motor: Plugging, dynamic braking and regenerative braking

5. Unit 5: Single Phase Induction Motors and Special Machines9 hours

   Constructional details of single phase induction motor · Double field revolving theory and operation · Equivalent circuit · No load and blocked rotor test · Performance analysis · Starting methods of single-phase induction motors · Capacitor-start capacitor run Induction motor · Shaded pole induction motor · Linear induction motor · Repulsion motor · Hysteresis motor · AC series motor · Servo motors · Stepper motors · introduction to magnetic levitation systems