Friday, 10 August 2012

VOCATIONAL INSTRUCTOR(MAINTENANCE AND REPAIRS OF RADIO & TELEVISION)

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1. ELECTRIC CIRCUIT, NETWORKS, MAGNETISM, AC FUNDAMENTALS,  TRANSFORMERS
Electric Current, Voltage Resistance, Specific Resistance, Electric Power, Electric
Energy   –   Definition   and   Units,   Laws   of   Resistance,     Temperature   Co­efficient   of
resistance, Ohms Law, Series, Parallel, Series – parallel circuits (DC) – calculation of
branch   current   and   voltages,   Kirchhoff’s   Laws,   Superposition   theorem,   Thevinin’s
Theorem, Static Electricity,  electric field, field strength or field intensity, flux density,
flux, Faraday’s Laws of electromagnetic induction, Flemings right hand rule, Flemings
left hand rule.  Generation of AC single phase & three phase voltage, difference between
AC and DC voltage, cycle, frequency, time period, amplitude, RMS value, average value,
power  factor, form  factor,  Q  factor,  phase,  phase   difference   –  definitions,   reactance,
impedance in RLC  series    circuit, Resonance,  single  phase and  three  phase  power  –
formula, voltage and current in star and delta connections, Transformer – construction
and working principle, motors and generators – working principles, relays.

2. PASSIVE COMPONENTS, ACTIVE COMPONENTS, SEMI CONDUCTORS, DISPLAY DEVICES, L E D
Carbon   film   resistor,   wire   wound   resistors,   metal   film   resistor­   application,
colour  coding,  variable  resistors  –  applications,  tolerance.   Capacitor   –  paper, mica,
polyester, ceramic – construction and applications, variable capacitors – applications.
Inductors, Chokes – RF and AF – applications, conductors, insulators, semi conductors,
intrinsic and extrinsic semi conductors, electrons, holes, doping, P and N type, majority
and minority carriers, PN junction, depletion layer, behaviour of PN junction under
forward and reverse bias, static and dynamic resistance, half wave, full wave, bridge
rectifiers, ripple factor, different types of filters, PNP and NPN transistors, CB and CE
configurations, clipping and clamping circuits – positive and negative, zenor diodes –
applications. UJT, FET, MOSFET, SCR, DIAC, TRIAC, power diodes – symbols and
applications, photo voltaic cell, L E D – construction – applications, LCD, LDR, OPTOCOUPLER, PHOTO diode – working and applications, seven segment display, laser
diodes ­ applications

3. ELECTRICAL AND ELECTRONICS MEASURING INSTRUMENTS AND INTRUMENTATION, TRANSDUCERS, POWER SUPPLY        
Primary   instrument,   secondary   instruments,   voltmeter,   ammeter,   wattmeter,
multimeters   –  analogue   and  digital   meters,  difference   between   analogue   and  digital
meters, Energy meter – Megger applications, CRO, CRT, measurement of voltage, time
period, frequency, and display of wave forms by using CRO.  Transducers – definition –
applications   –   selection,   LVDT,  Wheat   stone   bridge,   Strain   guage,   thermo   couples,
thermisters,   Piezo   electric   transducers   –   applications.     Function   generators,   RF
generators, AF generators – construction, applications, power supply, voltage regulation,
shunt voltage regulator, series voltages regulator, zenor voltage regulator – construction,
fixed and variables voltage power supply, DC regulated power supply, SMPS – working,
applications, UPS –ON line UPS, OFF line UPS.

4. DIGITAL ELECTRONICS, OP­AMPS, POWER AMPLIFIERS,OSCILLATORS
Number System, concept of bit and byte, convert decimal, hexadecimal to binary
and vice versa, binary addition, subtraction, multiplication and division, logic gates –
symbols and truth table of AND, OR, NOT, NAND, NOR, EX­OR gates, Universal
gates, Bollen Algebra, De­Morgans  theorem, Half adder – Full adder­truth  table and
symbols,  Subtractor, Encoders  and Decoders, Multiplexers  and De­multiplexers, flip
flops   –   JK,   SR,   T&D­flip   flops,   Counters   –   synchronous   and   asynchronous,   Shift
registers   –types,   A/D   converter,   D/A   converter,   Modems,   Op­amps   –   working   –
characteristics – applications, Schmitt trigger, integrator, differentiator, basic principles
of single stage and multi stage amplifier, power amplifier, direct coupled, RC coupled
amplifier,   Class   A,   Class   B,     Class   C     amplifier,   feedback   (positive   and   negative)
amplifier,Oscillators,   principles   of   sinusoidal   oscillation,   Barkhausen     criterion,   RC
oscillator,   crystal   oscillator,   Hartly   oscillators   –   applications,   conditions   oscillator,
multivibrators   –   Astable,   mono   stable,   bitable,   basic   concept   of   ICs   –   merits   and
limitations of ICs – applications, Types of ICs – analogue & digital, heat sinks.

5.     COMMUNICATIONS, MICRO PROCESSORS, ANTENNAS   
         
Introduction,   Elements   of   communication   systems,   modulation   and
demodulation, need for modulation, amplitude modulation, band width, frequency &
phase modulation, AM receivers, narrow band and wide band FM,  FM transmitters and
receivers, PCM, PWM, PPM, Satellite Communication system, antenna – types, dish
antenna, DTH   working,  applications,  Optical   Fibre     communications,  DVD  player,
Colour   TV,   colour   mixing,   Plasma   Television,   LCD   Television,  Mobile   TV,   Public
Address System, MP3  system,  Introduction  to microprocessors 8085, PC, SP, ALU,
Control Unit, Micro controller 8051, Ports & other peripheral devices, interfacing of
memory and other devices – RAM, ROM, PROMS, main features of micro processors
and micro controllers, register structure of micro processors.
NOTE: ­ It may be noted that apart from the topics detailed
above,   questions   from   other   topics   prescribed   for   the
educational   qualification   of   the   post   may   appear   in   the
question paper. There is no undertaking that all the topics
above may be covered in the question paper.

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