Electrical machines i , ii - Lecture Notes, Study Materials and Important questions answers

Electrical Machines I Lecture Notes, Study Materials and Important questions answers

Electrical Machines II Lecture Notes, Study Materials and Important questions answers

Subject : Electrical Machines I MAGNETIC CIRCUITS AND MAGNETIC MATERIALS 1.

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Magnetic Circuits and Magnetic Materials - Answer (click here) Laws Governing Magnetic Circuits - Answer (click here) Flux Linkage, Inductance and Energy - Answer (click here) Statically and Dynamically Induced Emf - Answer (click here) Properties of Magnetic Materials - Answer (click here) Iron or Core losses - Answer (click here) AC Operation of Magnetic Circuits - Answer (click here) Transformer as a Magnetically Coupled Circuit - Answer (click here) Solved problems - Magnetic Circuits and Magnetic Materials - Answer (click here)

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Important Short Questions and Answers : Electrical machines Magnetic Circuits and Magnetic Materials - Answer (click here)

TRANSFORMERS 1.

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Transformer: Principle of Operation - Answer (click here) An ideal Transformer: Principle of Operation - Answer (click here) Induction Law - Transformer - Answer (click here) Equivalent Circuit of Transformer - Answer (click here) Transformer Losses - Answer (click here) Transformer Tests - Answer (click here) Efficiency of a Transformer - Answer (click here) Voltage Regulation of Transformer - Answer (click here) Auto Transformer - Answer (click here) Three-phase autotransformer connection - Answer (click here) Parallel Operation of Transformers - Answer (click here)

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Tap Changing in Transformer - Answer (click here) Solved Problems - Transformer - Electrical machines - Answer (click here) Important Short Questions and Answers: Electrical machines Transformer - Answer (click here)

ELECTROMECHANICAL ENERGY CONVERSION AND CONCEPTS IN ROTATING MACHINES 1.

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Energy In Magnetic Systems - Answer (click here) The Field Energy - Answer (click here) The Co Energy - Answer (click here) Force In A Singly Excited Magnetic Field System - Answer (click here) Force in a Multiply Excited Magnetic Field System - Answer (click here) Mmf of Distributed Windings - Answer (click here) Magnetic Fields In Rotating Machines - Answer (click here) Rotating Mmf Waves - Answer (click here) Torque in Ac And Dc Machines - Answer (click here) Solved Problems - Electromechanical Energy Conversion and Concepts in Rotating Machines - Answer (click here) Important Short Questions and Answers - Electromechanical Energy Conversion and Concepts in Rotating Machines - Answer (click here)

DC GENERATORS 1.

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Construction of DC Machines - Answer (click here) Lap Winding - Answer (click here) Wave Winding - Answer (click here) EMF Equation of DC Generators - Answer (click here) Armature reaction - Answer (click here) Methods of excitation of the field windings - Answer (click here) Methods of Excitation used for DC Generator - Answer (click here) Commutation and Interpoles - Answer (click here) DC Generator Characteristics - Answer (click here) Important short questions and answers: DC Generators - Answer (click here)

DC MOTORS 1.

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Principle of operation of a D.C. Motor - Answer (click here) Working of D.C. Motor - Answer (click here) Types of DC Motors - Answer (click here) DC Motor Characteristics - Answer (click here)

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Speed Control of DC Shunt Motor: Varying Armature Resistance, Field Resistance - Answer (click here) Starting of DC Motors - Answer (click here) Three Point Starter: Working principle - Answer (click here) Four Point Starter - Answer (click here) Swinburne’s Test - Answer (click here) Hopkinson’s test: Procedure, Calculation of efficiency, Advantages, Disadvantages - Answer (click here) Braking of DC shunt motor - Answer (click here) Important Short questions and answers: DC Motor - Electrical machines - Answer (click here)

Subject : Electrical Machines II SYNCHRONOUS GENERATOR 1.

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Fundamental Principles of A.C. Machines - Answer (click here) E.M.F. equation of an elementary alternator single phase - Answer (click here)

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E.M.F. equation of an elementary alternator three phase - Answer (click here)

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Relation between speed and frequency - Answer (click here) Factors affecting the induced emf (Coil Pitch and Distributed Windings) - Synchronous Generator - Answer (click here) Armature Reaction - Synchronous Generator - Answer (click here) Synchronous Generators - Answer (click here) Open circuit characteristic (OCC) and Short Circuit Characteristics (SCC) of a Synchronous generator - Answer (click here) Armature Reaction Reactance - Synchronous Generators - Answer (click here)

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Synchronous reactance - Answer (click here) Short Circuit Ratio (SCR) - Synchronous Generator - Answer (click here) Load Characteristics - Synchronous Generator - Answer (click here) Potier Reactance - Synchronous Generator - Answer (click here) Voltage Regulation - Synchronous Generator - Answer (click here) Methods of finding Voltage Regulation in Synchronous Generator Answer (click here)

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Power angle characteristics - Answer (click here) Salient pole alternators and Blondel's Two Reaction Theory - Answer (click here)

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Direct-axis and Quadrature-axis Synchronous Reactances - Answer (click here)

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Power Angle Characteristic of Salient Pole Machine - Answer (click here) Slip Test - Answer (click here) Parallel Operation of Alternators - Answer (click here) Synchronizing Current - Answer (click here) Effect of Change of Excitation - Answer (click here) Effect of Change of Input Torque - Answer (click here) Sharing of load when two alternators are in parallel - Answer (click here) Prime-mover Governor Characteristic - Answer (click here) Important Short Questions and Answers: Synchronous Generator Answer (click here)

SYNCHRONOUS MOTOR 1.

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Synchronous Motors: Construction, Operating Principle, Equivalent Circuit - Answer (click here) Phasor Diagram - Synchronous Motors - Answer (click here) Torque and Power Relations - Answer (click here) V-Curves and Inverted V-Curves - Answer (click here) Effect of Changing Field Excitation at Constant Load - Answer (click here) Synchronous Condenser and its Advantages, Disadvantages - Answer (click here)

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Methods of starting synchronous motor - Answer (click here) Performance Characteristic of Synchronous Motors - Answer (click here) Hunting and Damper Winding - Answer (click here) Synchronous Induction Motor - Answer (click here) Important Short Questions and Answers: Synchronous Motors - Answer (click here)

THREE PHASE INDUCTION MOTOR 1.

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Three Phase Induction Motor - Answer (click here) Types and Construction of Three Phase Induction Motor - Answer (click here)

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Squirrel cage Induction Motors - Answer (click here) Slip ring Induction Motors - Answer (click here) Principle of Operation - Three Phase Induction Motor - Answer (click here) Rotating Magnetic Field and Induced Voltages - Answer (click here) Alternate Analysis for Rotating Magnetic Field - Answer (click here) Phasor Diagram of Three Phase Induction Motor - Answer (click here) Equivalent Circuit of Three Phase Induction Motor - Answer (click here) Power and Torque Relations of Three Phase Induction Motor - Answer (click here)

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Induction Motor Torque - Answer (click here) Rotor Output - Answer (click here) Circle Diagram - analyse the three phase induction motor performance Answer (click here)

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Tests to Determine the Equivalent Circuit Parameters - Induction Motor - Answer (click here) Construction of Circle Diagram - Induction Motor - Answer (click here) Performance Characteristics of Three phase Induction Motor - Answer (click here)

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Operation with Unbalanced Supply Voltage on Polyphase Induction Motors - Answer (click here) Important Short Questions and Answers: Three Phase Induction Motor Answer (click here)

STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION MOTOR 1.

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Methods of Starting Three Phase Induction Motors - Answer (click here) Starting of Slip-Ring Induction Motors - Answer (click here) Speed control of Three Phase Induction Motors - Answer (click here) Changing applied voltage - Speed control of Three Phase Induction Motors - Answer (click here) Rotor resistance control - Speed control of Three Phase Induction Motors - Answer (click here) Cascade control - Speed control of Three Phase Induction Motors Answer (click here)

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Pole changing method - Speed control of Three Phase Induction Motors - Answer (click here) Stator frequency control - Speed control of Three Phase Induction Motors - Answer (click here) Power Stages in an Induction Motor - Answer (click here) Double Cage Induction Motor: Construction, Working - Answer (click here) Cogging and Crawling of Induction Motor - Answer (click here) Induction Generator - Answer (click here) Induction Generator advantages, disadvantages and Application - Answer (click here)

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Induction Motor Braking Regenerative Plugging Dynamic - Answer (click here)

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Important Short Questions and Answers: Starting and Speed Control of Three Phase Induction Motor - Answer (click here)

SINGLE PHASE INDUCTION MOTORS AND SPECIAL

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Single Phase Induction Motors - Answer (click here) Double Revolving Field Theory of Single Phase Induction Motor Answer (click here)

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Equvalent Circuit of Single Phase Induction Motor - Answer (click here) Methods of Starting Single Phase Induction Motor - Answer (click here) Principle and Working of Split Phase Induction Motor - Answer (click here) Types of Split-Phase Induction Motors - Answer (click here) Repulsion starting - Single Phase Induction Motor: Construction, Working and Characteristics - Answer (click here) Shaped Pole Starting - Single Phase Induction Motor - Answer (click here) Single Phase Series Motor: Operation, Applications, Phasor Diagram Answer (click here)

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Schrage Motor - Answer (click here) Universal Motors: Operation, Characteristic, Applications - Answer (click here)

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Magnetic Levitation - Answer (click here) Stepper Motor Advantages and Disadvantages - Answer (click here) Important Short Questions and Answers: Single Phase Induction Motor and Special Machines - Answer (click here)