BASIC ELECTRICAL ENGINEERING (BEE)
Basic Fundamental
l Structure of Atom
l Atomic number
l Atomic weight
l Charge
l Miscellaneous
DC Circuits :
l Definition of basic terms
n DC/AC
n Frequency
n Drift velocity
n Electric force
n Mobility
n Current
n Current density
n Resistivity
n Conductivity
n Ohm’s Law and its limitations
n Electric Potential
n Potential Difference (PD)
n EMF
n Voltage Drop/Rige
n Power
l Colour Coding of Carbon Resistor
l Temperature Coefficient
l Current Division Rule
l Voltage Division Rule
l Electrical circuit elements (R, L and C)
l Factors affecting resistors and capacitors
l simple problems on series and parallel combinations of resistors
l Concept of active and passive elements
l voltage and current sources
l Liner and Non-Liner Element
l Active and Passive Element
l Unidirectional and Bidirectional Elements
l Kirchhoff‟s laws
l Star-delta transformation
l DC Circuit Theorems
n Superposition theorem
n Thevenin theorem
n Maximum Power Transfer Theorem
n Norton theorem
n Millman’s theorem
n Reciprocity theorem
n Substitution theorem
n Compensating theorem
n Tellegan’s theorem
Voltage and Current Sources
l Concept of voltage source
n symbol and graphical representation
n characteristics of ideal and practical sources
l Concept of current sources
n symbol and graphical representation
n characteristics of ideal and practical sources
l Inter Conversion of Voltage-Source and Current Source.
Magnetism
l Electro Magnetic Induction
n Concept of electro-magnetic field produced by flow of electric current magnetic circuit
n concept of magneto-motive force (MMF)
n flux, reluctance, permeability
l analogy between electric and magnetic circuit
l Faraday’s laws of electro-magnetic induction
l principles of self and mutual induction
l self and mutually induced e.m.f
l Concept of current growth
l decay and time constant in an inductive (RL) circuit
l Energy stored in an inductor
l series and parallel combination of inductors
Batteries
l Basic idea of primary and secondary cells
l Construction working principle and applications of Lead-Acid, NickelCadmium and Silver-Oxide batteries
l Charging methods used for lead-acid battery (accumulator)
l Care and maintenance of lead-acid battery
l Series and parallel connections of batteries
l General idea of solar cells
n solar panels and their applications
l Introduction to maintenance free batteries
AC Fundamentals
l Concept of alternating quantities
l Difference between ac and dc
l Concepts of
n Cycle
n Frequency
n time period
n Amplitude
n instantaneous value
n average value
n r.m.s. value
n maximum value
n form factor
n peak factor
l Representation of sinusoidal quantities by phasor diagrams
l Equation of sinusoidal wave form for an alternating quantity and its derivation
l Effect of alternating voltage applied to a pure resistance, pure inductance and pure capacitance.
AC Circuits
l Concept of inductive and capacitive reactance
l Alternating voltage applied to resistance and inductance in series
l Alternating voltage applied to resistance and capacitance in series
l Introduction to series and parallel resonance and its conditions
l Power in pure resistance, inductance and capacitance
l power in combined RLC circuits
l Power factor
l Bandwidth and quality factor
n active powe
n reactive power
n apparent power and their significance
n power factor improvement
l Definition of conductance, susceptance, admittance, impedance and their units
l Introduction to polyphase a.c. systems
n advantages of polyphase system over single phase system
n Relations between line and phase value of voltages and currents for star and delta connections and their phasor diagram
n power in polyphase circuits
Electrical Installations
l Components of LT Switchgear
n Switch Fuse Unit (SFU)
n MCB
n ELCB
n MCCB
l Types of Wires and Cables
l Importance of earthing