Syllabus Of APTRANSCO Assistant Engineer (Electrical) AE 2012

ANNEXURE - I

Syllabus for Written Test of AP Transco

Assistant Engineer (Electrical) 2011-12

Electric Circuits:

Network graph, KCL, KVL, node and mesh analysis,

star/ delta transformation; electromagnetic induction; mutual

induction; ac fundamentals; harmonics, transient response of dc and

ac networks; sinusoidal steady-state analysis, resonance, ideal current

and voltage sources, Thevenin’s, Norton’s, Superposition and Maximum

Power Transfer theorems, two-port networks, three phase circuits,

power measurement .

Electrical Machines:

 Single phase transformer - equivalent circuit,

phasor diagram, tests, regulation and efficiency; three phase

transformers - connections, parallel operation; auto-transformer; DC

machines - types, windings, generator/ motor characteristics, armature

reaction and commutation, starting and speed control of motors; three

phase induction motors - principles, types, performance

characteristics, starting and speed control; single phase induction

motors; synchronous machines - performance, regulation and parallel

operation of generators, motor starting, characteristics and

applications .

Power Systems: 

Basic power generation concepts; transmission line

models and performance; underground cable, string insulators; corona;

distribution systems; per-unit quantities; bus impedance and

admittance matrices; load flow; voltage control; power factor

correction; economic operation; symmetrical components; fault

analysis; principles of over-current, differential and distance protection;

protection of alternator, transformer, transmission lines neutral

earthing, solid state relays and digital protection; circuit breakers;

system stability concepts, swing curves and equal area criterion

Utilization & Control Systems: Principles of feedback; transfer

function; block diagrams; steady-state errors; Routh and Nyquist

techniques; Bode plots; root loci; lag, lead and lead-lag compensation;

Heating - resistance, induction, dielectric; Welding – spot, seam and

butt; Electric traction – speed-time curves, tractive effort;

Measurements: Bridges and potentiometers; PMMC, moving iron,

dynamometer and induction type instruments; measurement of

voltage, current, power, energy and power factor; digital voltmeters

and multi-meters; phase, time and frequency measurement; Q-meters;

oscilloscopes;

Analog and Digital Electronics: 

Characteristics of diodes, BJT, FET;

amplifiers - biasing, equivalent circuit and frequency response;

oscillators and feedback amplifiers; Combinational and sequential logic

circuits; multiplexer; Schmitt trigger; A/D and D/A converters; 8-bit

microprocessor basics, architecture, programming and interfacing.

Power Electronics and Drives: Semiconductor power diodes,

transistors, thyristors, triacs, GTOs, MOSFETs and IGBTs - static

characteristics and principles of operation; triggering circuits; phase

control rectifiers; bridge converters - fully controlled and half

controlled; principles of choppers and inverters; basic concepts of

adjustable speed dc and ac drives.