# Elements of Electrical Engineering for MSBTE I Scheme (II - Elex./Comp. - 22215)

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Unit - I Magnetic Circuits 1.1 Magnetic flux, flux density, magneto motive force, magnetic field strength, permeability, Reluctance. 1.2 Electric and magnetic circuits. 1.3 Series and parallel magnetic circuits. 1.4 Faraday's laws of electromagnetic induction, Fleming's right hand rule, Lenz's law. 1.5 Dynamically and statically induced emf, self and mutual inductance. 1.6 B-H curve and hysteresis, hysteresis loop and hysteresis loss. Unit - II AC Fundamentals 2.1 A.C. and D.C. quantity, advantages of A.C. over D.C. 2.2 Single phase A.C. sinusoidal A.C. wave : instantaneous value, cycle, amplitude, time period, frequency, angular frequency, R.M.S. value, Average value for sinusoidal waveform, Form factor, Peak factor. 2.3 Vector representation of sinusoidal A.C. quantity, phase angle, phase difference, concept of lagging and leading-by waveforms, mathematical equations and phasors. 2.4 Pure resistance, inductance and capacitance in A.C. circuit. 2.5 R-L and R-C series circuits. 2.6 Impedance and impedance triangle. 2.7 Power factor and its significance. 2.8 Power - active, reactive and apparent, power triangle. Unit - III Polyphase AC Circuits 3.1 3-phase system over 1 phase system. 3.2 3-phase emf generation and its wave form. 3.3 Phase sequence and balanced and unbalanced load. 3.4 Phase and line current, phase and line voltage in star connected and delta connected balanced system. 3.5 Current, power, power factor in a 3 phase balanced system. 3.6 Star and delta connections. Unit - IV Transformer and DC motors 4.1 Transformer : Working principle, emf equation, voltage ratio, current ratio and transformation ratio, losses. 4.2 Auto-transformer - comparison with two winding transformer, applications. 4.3 DC motor construction - parts its function and material used. 4.4 DC motor - principle of operation. 4.5 Types of D.C. motors, schematic diagram, applications of dc shunt, series and compound motors. Unit - V Fractional Horse Power (FHP) Motors 5.1 FIP : Schematic representation, principle of operation and applications of : split phase induction motor, capacitor start induction run, capacitor start capacitor run and permanent capacitor motors, shaded pole motors. 5.2 Universal motor : principle of operation, reversal of rotation and applications. 5.3 Stepper motor : types, principle of working and applications. Unit - VI Protective Devices and Switchgear 6.1 Fuse : Operation, types. 6.2 Switch fuse unit and fuse switch unit : differences. 6.3 MCB, MCCB and ELCB : Operation and general specifications. 6.4 Earthing : Importance of earthing, factors affecting earthing. 6.5 Methods of reducing earth resistance, I.E rules relevant to earthing.

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