WITH EFFECT FROM THE ACADEMIC YEAR 2011 - 2012

EE 221

ELECTRICAL CIRCUITS AND MACHINES

(Common to CSE, ME and PE)

Instruction                                                 4              Periods per week

Duration of University Examination    3              Hours

University Examination                          75            Marks

Sessional                                                   25            Marks

UNIT-I

DC & AC Circuits: Analysis of circuits using loop current method, Thevenin’s and Norton’s theorems, Sinusoidal sources, Phasor representation of sinusoidal quantities, Average and rms values, Active power. Reactive power, Energy stored in inductance and capacitance, Mutual inductance, Dot convention, analysis of simple coupled circuits.

UNIT-II

Production of 3-Phase Voltages: Analysis of 3-phase balanced circuits, 3 - phase power measurement by two-wattmeter method. Transformers: Principle of transformation of voltages and currents, Equivalent circuit of transformer on no load and load, Efficiency and regulation of transformer, OC and SC tests. Auto-transformer.

UNIT-III

DC Machines: Construction and working principle of a DC machine, Production of emf in a generator. Types of excitation, Characteristics of series, shunt and compound motors, Speed control and application of DC motors, Losses and efficiency.

UNIT-IV

Induction Motors: Production of rotating magnetic field. Construction and principle of operation of induction motors, Methods of starting and Speed control of 3-phasc induction motors, Speed-torque characteristics.

UNIT-V

Single-Phase & Special Motors: Various types of single phase motors. Split phase. Capacitor start and Capacitor run, Basic features of Stepper motor and Brushless DC motor

Suggested Reading:

1. 1.V. K. Mehta, Principles of Electrical Engineering, S. Chand & Co., 1995

Kothari and Nagrath, Basic Electrical Engineering, Tata McGraw Hill, 2^nd Edition �n-X# X�! pt;line-height:121%;font-family:"Times","serif"; color:#231F20'>Helical gear tooth relations, contact of helical gear teeth. Gear trains- Simple and compound, reverted, and epicyclic gear trains.

Suggested Reading:

1. 1.S.S. Rattan, Theory of Machines , Tata McGraw-Hill, 3^rd Edition, 2009.

1. 2.J.E.Shigley, Theories of Machines, McGraw-Hill Publications, 2005.

1. 3.Thomas Bevan, Theory of Machines, CBS Publishers,