SYLLABUS FOR DEPARTMENTAL EXAMINATION [Revised - 1999]
(for promotion of Senior Technicians etc. to the grade of Engineering Assistants)
PART I - BASIC PRINCIPLES OF ELECTRICITY AND ELECTRONICS
1. Basic Electricity: Concepts of current, voltage, power and energy, units of currents, voltage, power and energy, concepts of DC and AC - their differences, amplitude and frequency in AC, peak, average, instantaneous and RMS values, Ohm's law and its applications.
2. A.C. Circuits. :
Phase - Phase relationship between voltage and current in pure resistive, capacitive and inductive circuits, Active and reactive power - Physical concepts, power factor and correction of P.F., Poly-phase circuits, phase sequence, 3 phase circuits - Star and Delta connections, relationship between line and phase voltages and current, Power in single phase and 3-phase circuits, Balancing 3-phase circuits and its importance.
3. Electrical Wiring :
Electrical symbols, Standard wire gauge, types of conductors and insulators, switches and fuses, cabling, practices, earthing principles, circuit breaker (ACB and OCB), conduit wiring, power supply layout, meters and measuring instruments, CT's and PT's, Precautions in the use of CT.
4. Storage Batteries :
Different types of storage batteries, capacity and rating of batteries, Methods of charging, trickle charging, battery care and maintenance.
5. Components :
Different types of resistance, inductance and capacitance and their uses, Resistance, reactance and impedance. Current, voltage and power ratings, Non-inductive resistors.
6. RLC Circuits :
Colour codes for marking of resistors and capacitors, R, L and C-Series and parallel resonance circuits and their properties and uses - Resonance frequency, Q and Bandwidth concepts, Tuning and damping.
7. Electrical Machines :
idea of DC motors, particularly as used in ultra portable tape recorders
and cassette recorders. Speed variations their causes. Types of AC
Motors. Simple ideas of single and 3-phase motors - Induction,
Synchronous. Rating of a motor (HP of a motor)- Starters for motors,
speed change in motors, basic maintenance of motor, losses and
efficiency of motors.
8. Generators :
AC generators, Relationship between speed, frequency and voltage generated capacity. Single and 3-phase generators, Simple ideas of prime-movers, Petrol and diesel generators, operating principles and differences between the two, fuel oils, fuel pumps, cylinders, Piston and Piston rings, Governors and regulators, paralleling of the two generators - General ideas of maintenance of generators. Brushless excitation in Diesel Generators.
9. Safety Regulations:
Safety precautions, Fire fighting and First-aid including artificial respiration as detailed in the AIR "Manual of Safety Precautions".
10. Electronics :
The general principles of working of diodes, triodes, tetrodes and pentodes. Applications of vacuum tubes, concepts of rp. gm and m and their inter-relationship. Gas discharge tubes, gas diodes and thyratrons, their characteristics and uses. Conductors, semi-conductors and insulators. Doping, P.N. Semi conductors, simple ideas of current through such devices. Effect of temperature on semi-conductors, forward and reverse biasing of a P-N junction - PNP and NPN transistors. Zener diodes and their characteristics and applications. General ideas of FET, SCR, photo diodes and photo transistors. Varactor diode and its application, operational amplifiers, Digital basic, Logic gates and Digital numbering system.
11. Earthing Systems :
Concept of earthing. Different types of earthing. Earth pits. Measurement of earth resistance.
12. Semi-Conductors Circuitry :
The three configurations of transistor amplifiers, comparison with valve circuits characteristics, biasing methods and stabilisation. Transistor as an amplifier - voltage gain and power gain, input and output impedance in the three configurations.
13. Amplifiers and Oscillators :
Amplifier - Classifications and their characteristics, feedback in amplifiers - positive and negative feedback. Oscillators - different types, general ideas of their characteristics and uses : VCO and concept of PLL
Full and half wave rectifiers, Peak Inverse Voltage and its significance, filters, regulated power supplies including SMPS and CVT
15. Wave Filters:
Low pass, high pass, band pass and band reject filters, general ideas, their characteristics and applications.
Basic ideas of Antennas in medium wave, short wave and VHF range - their directional pattern and impedance.
17. Basic Concept of Satellite communication
PART II-A SOUND BROADCASTING
1. Sound Broadcasting - Basics :
18. A.M. Reception :
Super-heterodyne receivers. Block schematic of an A.M. communication receiver - general ideas of working of each stage, sensitivity, selectivity, fidelity and AGC - (Alignment of a receiver). Different types of receiving aerials - dipole, cage, inverted L-type, Rhombic and their directivity consideration. (Diversity reception) -identifying noise, interference, zero-beat, heterodyne; fading etc. on received signals - reception reports. (Basic receiver servicing methods and equipment.)
19. Magnetic Tape Recording :
Magnetic Tape-Biasing, De-magnetization, Play-back losses, properties of magnetic tape recording and play back heads, erase head, gap dimensions, tape transport, wow and flutter, amplifier system, frequency compensation and equalization, line up procedures for recording, use and care of tape recorders, recording tapes and standard test tapes.
20. Transmitter and Antennas
21. Satellite Broadcasting
R.N. Terminal, up-link and down link chains and parabolic antenna system.
22. Maintenance and Measurement
Basic ideas of distortion and noise levels - decibel notation - dB, dBm and VU. Basic ideas of measurement of frequency response, distortion and noise level in broadcast equipment. General ideas on maintenance of various equipment and maintenance schedule.
23. Air-conditioning Plants:
Dry bulb, wet bulb temperature and relative humidity. Significance of tonnage in an AC plant, evaporator, compressor, condenser and liquid receiver and their working principles - functioning of solenoid valve and thermostatic expansion valve - procedure for charging gas and purging, air-leak detection - basic routine maintenance of AC plants - use of instruments, like anemometer, halide detector. Requirements of sound insulation and methods to achieve comfort conditions in the studio.
PART II-B T.V. BROADCASTING
1. TV Broadcasting - Basic:
2. TV transmitters VHF/UHF
Block schematic of video and audio sections and operating principles - I.F. modulation - diplexers - VHF antennas - block schematic operating and pre-set controls - testing and alignment - synchronising circuits - FM sound systems. Salient features of BEL mark III and solid state TV transmitters in TV network. Transmitter measurements.
3. TV Receivers :
Working principles - basic servicing procedures for TV receivers and equipment needed, deflection circuits, picture tubes, remote operation. Concept of baluns.
4. Satellite Communication:
Block diagram of satellite transponder, uplink and down link chains, TV TRACT, S-Band & C Band TVRO system and PDAs.
5. Air-conditioning Plants :
Dry bulb, wet bulb temperature and relative humidity. Significance of tonnage in an AC Plant, evaporator, compressor, condenser and liquid receiver and their working principles - functioning of solenoid valve and thermostatic expansion valve - -procedure for charging gas and purging air-leak detection - basic routine maintenance of AC plants and use of instruments, like anemometer, halide detector, requirements and sound insulation and methods to achieve comfort conditions in the studio.