NORTHERN POWER DISTRIBUTION COMPANY OF A.P. Ltd.

NORTHERN POWER DISTRIBUTION COMPANY OF A.P. Ltd.

SYLLABUS FOR WRITTEN TEST OF APNPDCL

ELECTRICAL ENGINEERING GRADUATES - 2009.

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 and superposition and maximum power transfer theorems two-port networks, three phase circuits, power measurement.

Electrical Machines: Single-phase transformers - equivalent circuit, phasor diagram, tests regulation and efficiency, three phase transformer-connections, parallel operation, auto transformer, DC machines – types, windings, generators/ 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; pre-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 & Controlling Systems: Principles of feedback; transfer function; block diagrams; steady-state errors; Routh and Niquist 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 potentio meters, PMMC, moving iron, dynamometer and induction type instruments, measurement of voltage, current, power, energy and power factor, digital voltmeters and multimeters; 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; basics concepts of adjustable speed dc and ac drives.

Model of question paper

The question paper consists of one hundred multiple choice objective type questions, to be answered on the OMR answer sheet using HB pencil in 2 hours. A few questions are given as a model below. (CALCULATORS ARE NOT ALLOWED INTO THE EXAMINATION HALL. CANDIDATES HAVE TO BRING THEIR OWN PENCILS AND ERASERS)

1. The armature of a d.c. machine is made of a. Silicon steel b. wrought iron c. cast steel d. soft iron	A	B	C	D
2. The main drawback of a d.c. shunt generator is that a. Shunt circuit has high resistance. b. Generated voltage is small. c. terminal voltage drops considerably with load. d. it is expensive.	A	B	C	D
3. Transformers usually transfer electrical energy from primary to secondary with change in a. Frequency b. Voltage c. Power d. Time period.	A	B	C	D

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APNPDCL :: WARANGAL.