ELECTRICAL ENGINEERING

Unit-I
DC Circuit Analysis and Network Theorems:

• Circuit Concepts
• Concepts of network
• Active and passive elements
• Voltage and current sources
• Concept of linearity and linear network
• Unilateral and bilateral elements
• R, L, and C as linear elements
• Source transformation
• Kirchhoff’s laws
• Loop and nodal methods of analysis
• Star-delta transformation
• Network theorems: Superposition theorem
• Thevenin’s theorem
•  Norton’s theorem
• Maximum Power Transfer theorem

Unit-II
Steady-State Analysis of Single Phase AC Circuits:

• AC fundamentals:
• Sinusoidal, square and triangular waveforms – Average and effective values,
• Form and peak factors,
• Concept of phasors,
• phasor representation of sinusoidally varying voltage and current,
• Analysis of series, parallel, and series-parallel RLC Circuits,
• Resonance in series and parallel circuits,
• bandwidth and quality factor;
• Apparent, active & reactive powers,
• Power factor, Causes, and problems of low power factor,
• Concept of power factor improvement

Unit-III
Three Phase AC Circuits:

• Three-phase system-its necessity and advantages
• Star and delta connections
• Balanced supply and balanced load
• Line and phase voltage/current relations
• Three-phase power and its measurement
• Measuring Instruments
• Types of instruments
• Construction and working principles of PMMC and moving iron type voltmeters & ammeters
• Single phase dynamometer wattmeter
• Use of shunts and multipliers

Unit-IV
Introduction to Earthing and Electrical Safety:

• The need of Earthing of equipment and devices, important electrical safety issues.
• Magnetic circuit concepts
•  the analogy between electric & magnetic circuits, B-H curve
• Hysteresis and eddy current losses
• Mutual coupling with dot convention
• Magnetic circuit calculations
• Single Phase Transformer: Principle of operation
• Construction, EMF equation, Equivalent circuit, Power losses, Efficiency
• Introduction to autotransformer.

Unit-V
Electrical Machines:

• Concept of electromechanical energy conversion
• DC machines: Types, EMF equation of generator, and torque equation of motor
• Characteristics and applications of DC motors
• Three Phase Induction Motor: Types, Principle of operation, Slip-torque characteristics, Applications
• Single Phase Induction motor: Principle of operation and introduction to methods of starting, applications.
• Three Phase Synchronous Machines: Principle of operation of the alternator and synchronous motor and their applications