Engineering Services Exam Syllabus
Engineering Services Exam Syllabus
GENERAL ABILITY TEST
Part A: General English. The question
paper in General English will be designed
to test the candidate’s understanding of
English and workmanlike use of words.
Part B: General Studies: The paper in
General Studies will include knowledge of
current events and of such matters as of
everyday observation and experience in
their scientific aspects as may be expected
of an educated person. The paper will also
include questions on History of India and
Geography of a nature which candidates
should be able to answer without special
CIVIL ENGINEERING 1
(For both objective and conventional type
1. BUILDING MATERIALS
Timber : Different types and species
of structural timber, density-moisture
relationship, strength in different
directions, defects, influence of defects
on permissible stress, preservation, dry
and wet rots, codal provisions for
Bricks : Types, Indian Standard
classification, absorption, saturation
factor, strength in masonry, influence of
morter strength on masonry strength.
Cement : Compounds of, different
types, setting times, strength.
Cement Mortar : Ingredients,
proportions, water demand, mortars for
plastering and masony.
Concrete : Importance of W/C Ratio,
Strength, ingredients including
admixtures, worksability, testing for
strength, elasticity, non-destructive
testing, mix design methods.
Elastic constants, stress, plane stress,
Mohr’s circle of stress, strains, plane 2.
strain, Mohr’s circle of strain, combined
stress; Elastic theories of failure;
Simple bending, shear; Torsion of cir-
cular and rectangular sections and
Analysis of determinate structures – dif-
ferent methods including graphical
Analysis of indeterminate skeletal
frames – moment distribution, slope-
deflection, stiffness and force methods,
energy methods, Muller-Breslau prin-
ciple and application.
Plastic analysis of indeterminate beams
and simple frames – shape factors.
DESIGN OF STEEL STRUCTURES
Principles of working stress method.
Design of connections, simple mem-
bers, Built-up sections and frames,
Design of Industrial roofs. Principles of
ultimate load design. Design of simple
members and frames.
DESIGN OF CONCRETE AND MASONRY STRUCTURES
Limit state design for bending, shear,
axial compression and combined forces.
Codal provisions for slabs, beams, walls
and footings. Working stress method of
design of R.C. members.
Principles of prestressed concrete de-
sign, materials, methods of prestress-
ing, losses. Design of simple members
and determinate structures. Introduc-
tions to prestressing of indeterminate
Design of brick masonry as per I.S.
CONSTRUCTION PRACTICE, PLAN-
NING AND MANAGEMENT
Weight Batcher, Mixer, vibrator,
batching plant, concrete pump.
Cranes, hoists, lifting equipment.
Earthwork Equipment :
Power shovel, hoe, dozer, dumper,
trailers and tractor, rollers, sheep foot
Construction, Planning and Manage-
Bar chart, linked bar chart, work-break
down structures, Activity – on – arrow dia-
grams. Critical path, probabilistic activ-
ity durations; Event-based networks.
PERT network: Time-cost study, crash-
ing; Resource allocation.
(a) FLUID MECHANICS, OPEN
CHANNEL FLOW, PIPE FLOW
Fluid Properties, Pressure, Thrust,
Buoyancy; Flow Kinematics; Integra-
tion of flow equations; Flow measure-
ment; Relative motion; Moment of mo-
mentum; Viscosity, Boundary layer and
Control, Drag, Lift; dimensional Analy-
sis, Modelling; Cavitation; Flow oscil-
lations; Momentum and Energy prin-
ciples in Open channel flow, Flow con-
trols, Hydraulic jump, Flow sections
and properties; Normal flow, Gradually
varied flow; Surges; Flow development
and losses in pipe flows, Measure-
ments; Siphons; Surges and Water
hammer; Delivery of Power Pipe net-
(b) HYDRAULIC MACHINES AND
Centrifugal pumps, types, performance
parameters, scaling, pumps in parallel;
Reciprocating pumps, air vessels, per-
formance parameters; Hydraulic ram;
Hydraulic turbines, types, performance
parameters, controls, choice; Power
house, classification and layout, stor-
age, pondage, control of supply.
Hydrological cycle, precipitation and
related data analyses, PMP, unit and
synthetic hydrographs; Evaporation
and transpiration; Floods and their
management, PMF; Streams and their
gauging; River morphology; Routing of
floods; Capacity of Reservoirs.
(b) WATER RESOURCES ENGI-
Water resources of the globe: Multipur-
pose uses of Water: Soil-Plant-Water
relationships, irrigation systems, water
demand assessment; Storages and
their yields, ground water yield and well
hydraulics; Waterlogging, drainage
design; Irrigation revenue; Design of
rigid boundary canals, Lacey’s and
Tractive force concepts in canal de-
sign, lining of canals; Sediment trans-
port in canals; Non-Overflow and over-
flow sections of gravity dams and their
design, Energy dissipators and
tailwater rating; Design of headworks,
distribution works, falls, cross-drainage
works, outlets; River training.
WATER SUPPLY ENGINEERING
Sources of supply, yields, design of
intakes and conductors; Estimation of
demand; Water quality standards; Con-
trol of Water-borne diseases; Primary
and secondary treatment, detailing and
maintenance of treatment units; Con-
veyance of treatment units; Convey-
ance and distribution systems of
treated water, leakages and control;
Rural water supply; Institutional and
industrial water supply.
WASTE WATER ENGINEERING:
Urban rain water disposal; Systems of
sewage collection and disposal; De-
sign of sewers and sewerage systems;
pumping; Characteristics of sewage
and its treatment, Disposal of products
of sewage treatment, streamflow reju-
venation Institutional and industrial
sewage management; Plumbing Sys-
tems; Rural and semi-urban sanitation.
SOLID WASTE MANAGEMENT
Source, classification collection and
disposal; Design and Management of
AIR AND NOISE POLLUTION
Sources and effects of air pollution,
monitoring of air pollution; Noise pol-
lution an standards; Ecological chain
and balance, Environmental assess-
(a) SOIL MECHANICS
Properties of soil, classification and
behaviour, methods of compaction and
their choice; Permeability and seep-
age, flow nets, Inverted filters; Com-
pressibility and consolidation; Shear-
ing resistance, stresses and failure; soil
testing in laboratory and in-situ; Stress
path and applications; Earth pressure
theories, stress distribution in soil; soil
exploration, samplers, load tests, pen-
(b) FOUNDATION ENGINEERING
Types of foundations, Selection crite-
ria, bearing capacity, settlement, labo-
ratory and field tests; Types of piles
and their design and layout, Founda-
tions on expansive soils, swelling and
its prevention, foundation on swelling
Classification of surveys, scales, accu-
racy; Measurement of distances – di-
rect and indirect methods; optical and
electronic devices; Measurement of
directions, prismatic compass, local
attraction; Theodolites – types; Mea-
surement of elevations – Spirit and
trigonometric levelling; Relief repre-
sentation; Contours; Digital elevation
modelling concept; Establishment of
control by triangulations and travers-
ing – measurements and adjustment
of observations, computation of coor-
dinates; Field astronomy, Concept of
global positioning system; Map prepa-
ration by plane tabling and by photo-
grammetry; Remote sensing concepts,
(b) TRANSPORTATION ENGINEER-
Planning of highway systems, align-
ment and geometric design, horizon-
tal and vertical curves, grade separa-
tion; Materials and construction meth-
ods for different surfaces and mainte-
nance: Principles of pavement design;
Traffic surveys, Intersections, signal-
ling: Mass transit systems, accessibil-
Tunnelling, alignment, methods of con-
struction, disposal of muck, drainage,
lighting and ventilation, traffic control,
Planning of railway systems, terminol-
ogy and designs, relating to gauge,
track, controls, transits, rolling stock,
tractive power and track
modernisation; Maintenance; Appurte-
nant works; Containerisation.
Harbours – layouts, shipping lanes,
anchoring, location identification; Lit-
toral transport with erosion and depo-
sition; sounding methods; Dry and Wet
docks, components and operational
Tidal data and analyses.
Airports – layout and orientation; Run-
way and taxiway design and drainage
management; Zoning laws; Visual aids
and air traffic control; Helipads, hang-
ers, service equipment.
(For both objective and conventional type
1. Thermodynamics, Cycles and IC
Engines: Basic concepts, Open and
Closed systems. Heat and work. Ze-
roth, First and Second Law, Applica-
tion to non-Flow and Flow processors.
Entropy, Availability, Irreversibility and
Tds relations. Claperyron and real gas
equations, Properties of ideal gases
and vapours. Standard vapour, Gas
power and Refrigeration cycles. Two
stage compressor. C-I and S.I. En-
gines. Pre-ignition, Detonation and
Diesel-knock, Fuel injection and
Carburation, Supercharging. Turbo-
prop and Rocket engines, Engine
Cooling, Emission & Control, Flue gas
analysis, Measurement of Calorific val-
ues. Conventional and Nuclear fuels,
Elements of Nuclear power production.
2. Heat Transfer and Refrigeration and
Airconditioning: Modes of heat trans-
fer. One dimensional steady and un-
steady conduction. Composite slab
and Equivalent Resistance. Heat dis-
sipation from extended surfaces, Heat
exchangers, Overall heat transfer co-
efficient, Empirical correlations for heat
transfer in laminar and turbulent flows
and for free and forced Convection,
Thermal boundary layer over a flat
plate. Fundamentals of diffusive and
connective mass transfer, Black body
and basic concepts in Radiation, En-
closure theory, Shape factor, Net work
analysis. Heat pump and Refrigeration
cycles and systems, Refrigerants. Con-
densers, Evaporates and Expansion
devices, Psychrometry, Charts and
application to air conditioning, Sensible
heating and cooling, Effective tempera-
ture, comfort indices, Load calcula-
tions, Solar refrigerations, controls,
3. Fluid Mechanics.
Properties and classification of fluids,
Manometry, forces on immersed sur-
faces, Center of pressure, Buoyancy,
Elements of stability of floating bodies.
Kinematics and Dynamics.
Irrotational and incompressible. Invis-
cid flow. Velocity potential, Pressure
field and Forces on immersed bodies.
Bernoulli’s equation, Fully developed
flow through pipes, Pressure drop cal-
culations, Measurement of flow rate
and Pressure drop. Elements of bound-
ary layer theory, Integral approach,
Laminar and tubulent flows, Separa-
tions. Flow over weirs and notches.
Open channel flow, Hydraulic jimp.
Dimensionless numbers, Dimensional
analysis, Similitude and modelling.
One-dimensional isentropic flow, Nor-
mal shock wave, Flow through conver-
gent – divergent ducts, Oblique shock-
wave, Rayleigh and Fanno lines.
4. Fluid Machinery and Steam Genera-
Performance, Operation and control of
hydraulic Pump and impulse an reac-
tion Turbines, Specific speed, Classi-
fication. Energy transfer, Coupling,
Power transmission, Steam generators
Fire-tube and water-tube boilers. Flow
of steam through Nozzles and Diffus-
ers, Wetness and condensation. Vari-
ous types of steam and gas Turbines,
Velocity diagrams. Partial admission.
Reciprocating, Centrifugal and axial
flow Compressors, Multistage com-
pression, role of Mach Number, Re-
heat, Regeneration, Efficiency, Gover-
PAPER – II
5. THEORY OF MACHINES
Kinematic and dynamic analysis of
planer mechanisms. Cams. Gears and
gear trains. Flywheels. Governors. Bal-
ancing of rigid rotors and field balanc-
ing. Balancing of single and
multicylinder engines, Linear vibration
analysis of mechanical systems. Criti-
cal speeds and whirling of shafts Au-
6. MACHINE DESIGN
Design of Joints : cotters, keys, splines,
welded joints, threaded fasteners,
joints formed by interference fits. De-
sign of friction drives : couplings and
clutches, belt and chain drives, power
Design of Power transmission sys-
tems : gears and gear drives shaft and
axle, wire ropes.
Design of bearings : hydrodynamics
bearings and rolling element bearings.
7. STRENGTH OF MATERIALS
Stress and strain in two dimensions,
Principal stresses and strains, Mohr’s
construction, linear elastic materials,
isotropy and anisotropy, stress-strain
relations, uniaxial loading, thermal
stresses. Beams : Bending moment
and shear force diagram, bending
stresses and deflection of beams.
Shear stress distribution. Torsion of
shafts, helical springs. Combined
stresses, thick-and think-walled pres-
sure vessels. Struts and columns.
Strain energy concepts and theories of
8. ENGINEERING MATERIALS
Basic concepts on structure of solids.
Crystalline materials. Detects in crystal-
line materials. Alloys and binary phase
diagrams. Structure and properties of
common engineering materials. Heat
treatment of steels. Plastics, Ceramics
and composite materials. Common ap-
plications of various materials.
9. PRODUCTION ENGINEERING
Metal Forming : Basic Principles of
forging, drawing and extrusion; High
energy rate forming; Powder metallurgy.
Metal Casting : Die casting, invest-
ment casting, Shall Moulding, Centrifu-
gal Casting, Gating & Riser design;
Fabrication Processes : Principles of
Gas, Arc, Shielded arc Welding; Ad-
vanced Welding Processes,
Weldability: Metallurgy of Welding.
Metal Cutting : Turning, Methods of
Screw Production, Drilling, Boring, Mill-
ing, Gear Manufacturing, Production of
flat surfaces, Grinding & Finishing Pro-
cesses. Computer Controlled Manufac-
turing Systems-CNC, DNC, FMS, Au-
tomation and Robotics.
Cutting Tools Materials, Tool Geom-
etry, Mechanism of Tool Wear, Tool
Life & Machinability; Measurement of
cutting forces. Economics of Machin-
ing. Unconventional Machining Pro-
cesses. Jigs and Fixtures. Fits and tol-
erances, Measurement of surface tex-
ture, Comparators Alignment tests and
reconditioning of Machine Tools.
10. INDUSTRIAL ENGINEERING
Production Planning and Control :
Forecasting – Moving average, expo-
nential smoothing, Operations, sched-
uling; assembly line balancing, Product
development, Break-even analysis,
Capacity planning, PERT and CPM.
Control Operations : Inventory control ABC
analysis, EOQ model, Materials require-
ment planning. Job design, Job standards,
Work measurement, Quality Management
– Quality analysis and control. Operations
Research : Linear Programming – Graphi-
cal and Simplex methods, Transportation
and assignment models. Single server
Value Engineering : Value analysis for cost/
11. ELEMENTS OF COMPUTATION
Computer Organisation, Flow charting,
Features of Common computer Lan-
guages – FORTRAN, d Base III, Lotus
1-2-3, C and elementary Programming.
(For both objective and conventional
PAPER – I
1. EM Theory
Electric and magnetic fields. Gauss’s
Law and Amperes Law. Fields in di-
electrics, conductors and magnetic
materials. Maxwell’s equations. Time
varying fields. Plane-Wave propagat-
ing in dielectric and conducting media.
2. Electrical Materials
Band Theory, Conductors, Semi-con-
ductors and Insulators. Super-conduc-
tivity. Insulators for electrical and elec-
tronic applications. Magnetic materials.
Ferro and ferri magnetism. Ceramics,
Properties and applications. Hall effect
and its applications. Special semi con-
3. Electrical Circuits
Circuits elements. Kirchoff’s Laws.
Mesh and nodal analysis. Network
Theorems and applications. Natural
response and forced response. Tran-
sient response and steady state re-
sponse for arbitrary inputs. Properties
of networks in terms of poles and ze-
ros. Transfer function. Resonant cir-
cuits. Threephase circuits. Two-port
networks. Elements of two-element
4. Measurements and Instrumentation
Units and Standards. Error analysis,
measurement of current, Voltage,
power, Power-factor and energy. Indi-
cating instruments. Measurement of
resistance, inductance, Capacitance
and frequency. Bridge measurements.
Electronic measuring instruments.
Digital Voltmeter and frequency
counter. Transducers and their appli-
cations to the measurement of non-
electrical quantities like temperature,
pressure, flow-rate displacement, ac-
celeration, noise level etc. Data acqui-
sition systems. A/D and D/A convert-
5. CONTROL SYSTEMS
Mathematical modelling of physical
systems. Block diagrams and signal
flow graphs and their reduction. Time
domain and frequency domain analy-
sis of linear dynamical system. Errors
for different type of inputs and stability
criteria for feedback systems. Stability
analysis using Routh-Hurwitz array,
Nyquist plot and Bode plot. Root locus
and Nicols chart and the estimation of
gain and phase margin. Basic concepts
of compensator design. State variable
matrix design. Sampled data system
and performance of such a system with
the samples in the error channel. Sta-
bility of sampled data system. Ele-
ments of non-linear control analysis.
Control system components, electro-
mechanical, hydraulic, pneumatic com-
PAPER – II
1. Electrical Machines and Power
Magnetic Circuits – Analysis and De-
sign of Power transformers. Construc-
tion and testing. Equivalent circuits.
Losses and efficiency. Regulation.
Auto-transformer, 3-phase trans-
former. Parallel operation.
Basic concepts in rotating machines.
EMF, torque, basic machine types.
Construction and operation, leakage
losses and efficiency.
D.C. Machines. Construction, Excita-
tion methods. Circuit models. Armature
reaction and commutation. Character-
istics and performance analysis. Gen-
erators and motors. Starting and speed
control. Testing, Losses and efficiency.
Synchronous Machines. Construction.
Circuit model. Operating characteris-
tics and performance analysis. Syn-
chronous reactance. Efficiency. Volt-
age regulation. Salient-pole machine,
Parallel operation. Hunting. Short cir-
Induction Machines. Construction.
Principle of operation. Rotating fields.
Characteristics and performance
analysis. Determination of circuit
model. Circle diagram. Starting and
Fractional KW motors. Single-phase
synchronous and induction motors.
2. Power systems
Types of Power Stations, Hydro, Ther-
mal and Nuclear Stations. Pumped
storage plants. Economics and oper-
Power transmission lines. Modeling
and performance characteristics. Volt-
age control. Load flow studies. Opti-
mal power system operation. Load fre-
quency control. Symmetrical short cir-
cuit analysis. Z-Bus formulation. Sym-
metrical Components. Per Unit repre-
sentation. Fault analysis. Transient and
steady-state stability of power systems.
Equal area criterion.
Power system Transients. Power sys-
tem Protection Circuit breakers. Re-
lays. HVDC transmission.
3. ANALOG AND DIGITAL ELECTRON-
ICS AND CIRCUITS
Semiconductor device physics, PN
junctions and transistors, circuit mod-
els and parameters, FET, Zener, tun-
nel, Schottky, photo diodes and their
applications, rectifier circuits, voltage
regulators and multipliers, switching
behavior of diodes and transistors.
Small signal amplifiers, biasing circuits,
frequency response and improvement,
multistage amplifiers and feed-back
amplifiers, D.C. amplifiers, coupling
methods, push pull amplifiers, opera-
tional amplifiers, wave shaping circuits.
Multivibrators and flip-flops and their
applications. Digital logic gage families,
universal gates- combinational circuits
for arithmetic and logic operational,
sequential logic circuits. Counters, reg-
isters, RAM and ROMs.
tion set and simple assembly language
programming. Interfacing for memory
and I/O. Applications of Micro-proces-
sors in power system.
5. COMMUNICATION SYSTEMS
Types of modulation; AM, FM and PM.
Demodulators. Noise and bandwidth
considerations. Digital communication
systems. Pulse code modulation and
demodulation. Elements of sound and
vision broadcasting. Carrier communi-
cation. Frequency division and time
division multiplexing, Telemetry system
in power engineering.
6. POWER ELECTRONICS
Power Semiconductor devices. Thyris-
tor. Power transistor, GTOs and
MOSFETs. Characteristics and opera-
tion. AC to DC Converters; 1-phase
and 3-phase DC to DC Converters. AC
regulators. Thyristor controlled reac-
tors; switched capacitor networks.
Inverters; single-phase and 3-phase.
Pulse width modulation. Sinusoidal
modulation with uniform sampling.
Switched mode power supplies.
ELECTRONICS & TELECOMMUNICATION ENGINEERING
(For both objective and conventional type
PAPER – I
1. Materials and Components
Structure and properties of Electrical
Engineering materials; Conductors,
Semiconductors and Insulators, mag-
netic, Ferroelectric, Piezoelectric, Ce-
ramic, Optical and Super-conducting
materials. Passive components and
characteristics Resistors, Capacitors
and Inductors; Ferrities, Quartz crys-
tal Ceramic resonators, Electromag-
netic an Electromechanical compo-
2. Physical Electronics, Electron De-
vices and ICs
Electrons and holes in semiconductors,
Carrier Statistics, Mechanism of cur-
rent flow in a semiconductor, Hall ef-
fect; Junction theory; Different types of
diodes and their characteristics; Bipo-
lar Junction transistor; Field effect tran-
sistors; Power switching devices like
SCRs, CTOs, power MOSFETs; Ba-
sics of ICs – bipolar, MOS and CMOS
types; basic of Opto Electronics.
3. Signals and Systems
Classification of signals and systems:
System modelling in terms of differen-
tial and difference equations; State
variable representation; Fourier series;
Fourier representation; Fourier series;
Fourier transforms and their applica-
tion to system analysis; Laplace trans-
forms and their application to system
analysis; Convolution and superposi-
tion integrals and their applications; Z-
transforms and their applications to the
analysis and characterisation of dis-
crete time systems; Random signals
and probability, Correlation functions;
Spectral density; Response of linear
system to random inputs.
4. Network theory
Network analysis techniques; Network
theorems, transient response, steady
state sinusoidal response; Network
graphs and their applications in net-
work analysis; Tellegen’s theorem.
Two port networks; Z, Y, h and trans-
mission parameters. Combination of
two ports, analysis of common two
ports. Network functions : parts of net-
work functions, obtaining a network
function from a given part. Transmis-
sion criteria : delay and rise time,
Elmore’s and other definitions effect of
cascading. Elements of network syn-
5. Electromagnetic Theory
Analysis of electrostatic and magneto-
static fields; Laplace’s and Piossons’s
equations; Boundary value problems
and their solutions; Maxwell’s equa-
tions; application to wave propagation
in bounded and unbounded media;
Transmission lines : basic theory,
standing waves, matching applica-
tions, misconstrue lines; Basics of
wave guides and resonators; Ele-
ments of antenna theory.
6. Electronic Measurements and in-
Basic concepts, standards and error
analysis; Measurements of basic elec-
trical quantities and parameters; Elec-
tronic measuring instruments and their
principles of working : analog and digi-
tal, comparison, characteristics, applica-
tion. Transducers; Electronic measure-
ments of non electrical quantities like
temperature, pressure, humidity etc;
basics of telemetry for industrial use.
PAPER – II
1. Analog Electronic Circuits
Transistor biasing and stabilization.
Small signal analysis. Power amplifi-
ers. Frequency response. Wide band-
ing techniques. Feedback amplifiers.
Tuned amplifiers. Oscillators. Rectifi-
ers and power supplies. Op Amp PLL,
other linear integrated circuits and ap-
plications. Pulse shaping circuits and
Digital Electronic Circuits
Transistor as a switching element;
Boolean algebra, simplification of Bool-
ean functions, Karnaguh map and ap-
plications; IC Logic gates and their
characteristics; IC logic families : DTL,
TTL, ECL, NMOS, PMOS and CMOS
gates and their comparison; Combina-
tional logic Circuits; Half adder, Full
adder; Digital comparator; Multiplexer
Demultiplexer; ROM and their applica-
tions. Flip flops. R-S, J.K, D and T flip-
flops; Different types of counters and
registers Waveform generators. A/D
and D/A converters. Semiconductor
Transient and steady state response
of control systems; Effect of feedback
on stability and sensitivity; Root locus
techniques; Frequency response
analysis. Concepts of gain and phase
margins: Constant-M and Constant-N
Nichol’s Chart; Approximation of tran-
sient response from Constant-N
Nichol’s Chart; Approximation of tran-
sient response from closed loop fre-
quency response; Design of Control
Systems, Compensators; Industrial
Basic information theory; Modulation
and detection in analogue and digital
systems; Sampling and data recon-
structions; Quantization & coding;
Time division and frequency division
multiplexing; Equalization; Optical
Communication : in free space & fiber
optic; Propagation of signals oat HF,
VHF, UHF and microwave frequency;
Microwave Tubes and solid state de-
vices, Microwave generation and am-
plifiers, Waveguides and other Micro-
wave Components and Circuits, Mis-
construe circuits, Microwave Anten-
nas, Microwave Measurements, Ma-
sers, lasers; Microwave propagation.
Microwave Communication Systems
terrestrial and Satellite based.
6. Computer Engineering
Number Systems. Data representation;
Programming; Elements of a high level
programming language PASCAL/C;
Use of basic data structures; Funda-
mentals of computer architecture; Pro-
cessor design; Control unit design;
Memory organisation, I/o System
Organisation. Microprocessors : Archi-
tecture and instruction set of Micropro-
cessors 8085 and 8086, Assembly lan-
guage Programming. Microprocessor
Based system design : typical ex-
amples. Personal computers and their
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