Contents

Engineering Assistant Electronics|

Syllabus Engineering Assistant Electronics: DETAILED SYLLABUS FOR THE POST OF ENGINEERING ASSISTANT(ELECTRONICS)/OVERSEER GR.I(ELECTRONICS) IN PWD(ELECTRONICS WING)(CATEGORY NO.578/2024)

Main Topics of Syllabus: Engineering Assistant Electronics

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Electronic Devices and Circuits – 25 Marks
Electronic Communication – 25 Marks
Satellite Communication – 25 Marks
Mobile Communication – 25 Marks

Also Check: Electronics Engineering MCQ

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578/2024 Syllabus Kerala PSC

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Objective Electronics & Telecommunication Engineering

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ELECTRONIC DEVICES AND CIRCUITS (25 Marks)

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Diodes: Semiconductors – PN Junction diode – Forward and reverse bias
characteristics – specifications – Zener diode – construction and working
principle – characteristics – Zener break down – Avalanche break down –
Zener diode as a voltage regulator – applications – specifications.
Rectifier:Introduction – Classification of Rectifiers – Half Wave rectifier –
Full Wave rectifier – Bridge rectifier – Efficiency – Ripple factor –
Applications – Filters – C, LC and PI filters.

Transistor: Transistor as an amplifier –Transistor biasing – Fixed bias,
Collector base bias, Self bias – CB, CE, CC Configurations –
Characteristics – comparison between three configurations in terms if input
impedance, output impedance, current gain, voltage gain – RC coupled
amplifier – Load characteristic analysis – Emitter follower and its
applications – Negative feed back – Transistor as a switch. Transistor
oscillator – classifications – condition for oscillation (Barkhausen criterion)
– General form of LC oscillator – Hartley oscillator – Colpitts oscillator –
RC phase shift oscillator , Crystal oscillator .
Field Effect Transistor: Construction – working principle of FET –
Difference between FET and BJT – characteristics of FET – specifications –
FET amplifier (Common source amplifier), FET as CHOPPER, UJT –
construction – equivalent circuit – operation -characteristics – UJT as a
relaxation oscillator. MOSFET – construction – characteristics – MOSFET
as a switch – CMOS basic concept IGBT – Basic principle – IGBT as a
switch.

Opto – Electronics Devices and Waveshaping Circuits: LDR, LED, 7
segment LED, LCD, Opto coupler –Opto interruptor – Infrared transmitter
and Receiver – Laser Diode – Solar Cell – Avalanche Photodiode – Photo
transistor. Diode clipper – Types – Clamper circuits using diode – Voltage
doubler – Astable, Monostable and Bistable operations using Transistor.
Operational Amplifier : Ideal op.Amp – Block diagram and
characteristics – (Minus input follows Plus input and no current through
Minus and Plus input) – Op-amp parameters- CMRR – Slew rate – Virtual
ground – Applications of op-amp-Inverting amplifier – Summing amplifier
– Non inverting amplifier – Voltage follower – Comparator – Zero crossing
detector – Integrator – Differentiator – Op.Amp specifications. 555 Timer –
Functional Block diagram – Astable, Monostable and Schmitt Trigger –
Sequence timer. IC voltage regulator – 3 pin IC regulators – 78xx, 79xx,
LM 317.

D/A Convertor: Basic concepts – Weighted Resistor D/A convertor – R2R Ladder D/A convertor – Specification of DAC IC Sampling and
quantization – Analog to digital conversion using Ramp method –
Successive approximation method – Dual slope method, simultaneous
method voltage to frequency convertor – Frequency to voltage convertor
specification of A/D convertor.

ELECTRONIC COMMUNICATION (25 Marks)

Networks: Symmetrical and asymmetrical networks, characteristic impedance
and propagation constant deviation of characteristic impedance for T and Pi
networks using Zoc and Zsc, image and iterative impedances – Derivation of
Z11 and Z12 for assymetrical T and L Networks using Zoc and Zsc, Derivation of
iterative impedances for assymetrical T network. Equaliser : Types, applications,
constant resistance equalizer. (No derivations)
Attenuator: types, derivations for elements of symmetrical T and Pi networks –
application.

Filters: types and definitions – derivations for circuit elements and cut off frequencies
of LPF and HPF only. Transmission lines (No equations and derivations):
Transmission line equivalent circuit, primary and secondary constants, travelling and
standing waves, SWR, Wave guides: types,advantages.

Antennas & Propagation: Basic antenna principle, directive gain, directivity,
radiation pattern, broad-side and end-fire array, Yagi antenna, Parabolic antenna.
Ground wave propagation, space waves, ionospheric propagation.

Modulation: Electromagnetic Frequency spectrum. Need for modulation, types of
modulation. Amplitude modulation: expression, AM spectrum and side bands, types
of AM – balanced modulator. SSB generation – phase shift and filter methods,
advantages and disadvantages of SSB, AM VSB System. Diode detector AM
Transmitter : Types of Transmitters, Block diagram – high level AM transmitter and
low level AM transmitter. SSB transmitter, ICW and MCW principles . AM
receiver: TRF receiver, superheterodyne radio receiver – explanations of individual
stages – AGC types, SSB receiver

Frequency modulation: Expression, wave forms, frequency spectrum , effects of
noise in FM, comparison of AM and FM, varactor diode modulator. FM detectors –
slope detector, phase discriminator, ratio detector (no derivation)
FM Transmitters : Direct and Indirect methods – stereophonic FM transmitter.
FM Receiver : Block Diagram – AFC – Stereophonic FM receiver

Phase modulation: Principles, Phase modulator circuit, comparison between FM
and PM Pulse modulation: Types, Sampling Theorem, Generation and detection of PAM,
PWM and PPM, PCM – transmitter, receiver, quantizing noise – companding.

Microphones: Construction and performances of the following microphones:
carbon, condenser, peizo electric, moving coil and velocity ribbon.
Loud Speakers: Constructional details of dynamic cone type, Horn type and
electrostatic loud speakers, woofer, midrange and tweeter ; cross over network,
surround – sound systems
Audio recording and reproduction: Magnetic system – Compact Disc system –
MP3 system – DVD System – stereophonic system – Hi-Fi- system principles –
Dolby – DTS.

Monochrome Television : Scanning principles aspect ratio – composite video
signal – TV standards. TV transmitter – TV receiver.
Colour TV : Principles of Colour Transmission and reception –color CCD camera.
PAL colour TV receiver (IC details not required) Digital Colour TV receiver LCD
display unit – plasma display – principles of Handy Cam , LCD projector principles
of CCTV and Cable TV.

Radar: Fundamentals Basic Radar System – Applications – Radar range equation –
factors influencing maximum range – Target properties – Pulsed Systems – Basic
Pulsed Radar System – Bloc Diagram – Display methods – PPI display – Automatic
target detection. Radio aids to navigation – Direction finding – Radio ranges –
Radio Compass – Radio Telemetry – Instrument landing system – Ground
controlled approach system.

Telephone System : Public Telephone Network –Private Telephone Network –
Electronic switching System –Block Diagram –– Cordless Phone – Block diagram –
Video Phone – Block Diagram- ISDN – Architecture – Features.

Facsimile Communication System: Introduction – facsimile sender –
Cyllindrical scanning – Tape scanning – facsimile receiver – synchronisation –
phasing – Index of Co-operation (IOC) – photographic recording – Direct recording.
Digital Communication: Fundamental Block Diagram and Basic elements of
digital communication system – Advantages, disadvantages of digital
communication – characteristics of data transmission circuits – Band Width
requirements – speed – Baud rate – Noise – Cross Talk – Distortion – Equalizers –
Echo Compressors.

Digital Codes : Baudot Code – ASCII Code – EBCDIC Code – Error detection
codes – Parity check codes – Redundant Codes – Constant Ratio Codes – Error
correction codes – Retransmission, forward error correcting code – Hamming Code.
Digital modulation techniques : ASK modulation /demodulation – FSK
modulation / Demodulation – PSK modulation / demodulation – only block diagram
and operation.

Data sets and interconnection: Classification of Modems – Modem interfacing –
serial interface standard.

Optical communication: Optical communication System – Block Diagram –Need
and advantages of optical fibers – principles of light transmission in a fibre using
Ray theory – Single mode fibers – multimode fibers – step index fibers –graded
index fibers (Fabrication details not required) -Attenuation in optical fibers –
Absorption losses, scattering losses, bending losses, core and cladding losses,
Dispersion – material dispersion, Wave guide Dispersion, Intermodal dispersion –
optical sources – LED – semi conductor LASER – principles – optical detectors –
PIN and APD diodes – connectors and splices Optical cables – couplers – optical
transmitter – Block diagram using laser feed back control circuit – optical receiver –
Block diagram using APD – Applications of optical fibers – civil, Industry and
Military applications (with descriptive block diagram)

SATELLITE COMMUNICATION (25 Marks)

Satellite System – Kepler’s I, II, II Laws – Orbits –types – Geostationary
synchronous satellites – Advantages – LEO, MEO – Advantages – Apogee –
Perigee – Active and Passive satellite – Earth Eclipse of Satellite – Launching Orbit
– Parabolic reflector antenna – cassegrain antenna. Space segment – power supply –
Attitude control – station keeping – Transponders – TT and C subsystem – Thermal
control – Antenna subsystem. Earth segment – Receive only Home TV system –
Block Diagram – Transmit Receive Earth Station – Block Diagram . Satellite Services
– INTELSAT – GPS – MSAT

MOBILE COMMUNICATION (25 Marks)

Cellular Telephone – Evolution – Fundamental concepts – simplified cellular
telephone system – frequency reuse – Interference –Co – Channel interference –
Adjacent channel Interference – Improving coverage and capacity in cellular systems
– cell splitting – sectoring – Roaming and Handoff. Satellite multiple access
techniques – TDMA, FDMA, CDMA
Digital Cellular System – Global system for mobile communications (GSM) – GSM
services – GSM System Architecture – Radio subsystem.

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Also Check: Electronics Engineering MCQ

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