JELET 2025 Exam - Date (Out), Application Form, Syllabus, Pattern, Eligibility, Preparation Tips

Electrical technology: Unit 01

• Kirchoff's voltage and current laws, star-delta transformations, simple problems on all topics

Electrical technology: Unit 02

• Concept and significance of RMS value, peak value, average value, crest factor and form factor of sinusoidal voltage/ current-equation of instantaneous value of sinusoidal voltage/ current, simple problems on all

Electrical technology: Unit 03

• R-L and R-C A.C. series circuit (no deduction, only the expressions of voltage, current and power for sinusoidal sources), power factor, power triangle simple problems

Electrical technology: Unit 04

• Basic principle of: Storage cell, D.C. motors, transformer, A.C. generators and motors (no deduction and problems)

Electrical technology: Unit 05

• Concept on magnetic circuit, definitions and units of magnetic flux, mmt and reluctance, analogy with electrical circuit, simple problems

Electrical technology: Unit 06

• Need of motor starter mentioning some names useful for D.C. motors and A.C. motors

Electrical technology: Unit 07

• Simple electrical circuit for motor installation, using block diagram of different components

Electrical technology: Unit 08

• Brief idea about the power generation, transmission, and distribution using block diagram of different stages

Electrical technology: Unit 09

• Brief idea about the operational principle of voltage stabilizer and UPS system (no description of internal circuit)

Electrical technology: Unit 10

• Simple idea house wiring starting from commencement of supply, using necessary diagram, role of fuses/ MCB, fault finding and earthing concept

Electrical technology: Unit 11

• Types of lighting scheme and factors considered for designing lighting schemes that is illumination level, uniformity of illumination, colour of light, glare, mounting height, spacing between luminaries, colour of surrounding walls, etc

Electrical technology: Unit 12

• Uses and connection diagram of Wattmeter-use of Megger with circuit diagram

Electrical technology: Unit 13

• Electrical energy measurement (no mathematical deduction and description of apparatus)-circuit diagram for single phase energy, meter connection

Computer applications and programming: Unit 01

• Brief history of evolution of computers, various components of computer (brief knowledge), hardware: CPU, inputs output system, primary memory, secondary memory
• Peripherals devices: Printers, plotter, scanners, digitals cameras, web cam. Sound card and speaker systems, dictaphone
• Software operating system, system software like compilers and device drivers, and various application software (definitions only)

Computer applications and programming: Unit 02

• Number system: Binary, octal and hexadecimal, conversion of number systems, signed and unsigned representation, binary arithmetic and compliments, character codes: ASCII. BCD and gray codes

Computer applications and programming: Unit 03

• Classification of software systems-system software and application software
• Basic concepts of compilers, interpreters, assemblers, and device drives, operating system-single user, multi user, graphical user interfaces, and characters user interfaces
• Case studies: MS-DOS, Windows

Computer applications and programming: Unit 04

• Algorithm and flowchart, different types of programming languages-machine level, assembly level and high-level languages (basic concepts only), brief introduction to different high-level languages including C, basics of C-Language
• Branching and looping statements, arrays and user defined functions

Computer applications and programming: Unit 05

• Basics of computer networking-LAN, MAN, WAN (definitions only), client-server architecture (elementary level), internetworking concepts of world wide web, domain name system emails, web browsing, use of search engines, website hosting (elementary level)

Environmental engineering: Unit 01

• Man and environment
• Overview (socio-economic structure and occupational exposures)-scope of environmental engineering, pollution problem due to urbanisation and industrialisation

Environmental engineering: Unit 02

• Causes of air pollution-types and sources of air pollutants, climatic and meteorological effect on air pollution concentration, formation of smog and fumigation

Environmental engineering: Unit 03

• Collection of gaseous air pollutants-collection of participate pollutants, analysis of air pollutants like: Sulphur dioxide, nitrogen oxide, carbon monoxide, oxidants and ozone, hydrocarbons, particulate matter

Environmental engineering: Unit 04

• Control of particulate emission-control of gaseous emission, flue gas treatment methods: Stacks gravitational and inertial separation
• Settling chambers
• Dynamic separators
• Cyclones
• Filtration, liquid scrubbing
• Spray chambers
• Packed towers
• Orifice and venturi scrubbers, electrostatic precipitators
• Gas/ solid absorption, thermal decomposition

Environmental engineering: Unit 05

• Controlling smoke nuisance-develop air quality criteria and practical emission standards, creating zones suitable for industry based on micrometeorology of air area
• Introducing artificial methods of removal of particulate and matters of waste before discharging to open atmosphere

Environmental engineering: Unit 06

• Origin of waste water-type of ‘water pollutants and their effects

Environmental engineering: Unit 07

• Biological pollution (point and nonpoint sources)-chemical pollutants: Toxic organic and inorganic chemicals, oxygen demanding substances, physical pollutants: Thermal waste, radioactive waste
• Physiological pollutants: Taste affecting substances-other forming substances

Environmental engineering: Unit 08

• Adverse effects on: Human health and environment, aquatic life, animal life, plant life, water pollution measurement techniques, water pollution control equipment and instruments, Indian standards for water pollution control

Environmental engineering: Unit 09

• Liquid and solid wastes-domestic and industrial wastes, pesticides, toxic: Inorganic and organic pollutants, soil deterioration, poor fertility, septicity
• Groundwater pollution, concentration of infecting agents in soil

Environmental engineering: Unit 10

• Dumping domestic and industrial solid wastes: Advantages and disadvantages, incineration: Advantages and disadvantages-sanitary landfill: Advantages and disadvantages-management of careful and sanitary disposal of solid wastes

Environmental engineering: Unit 11

• Noise pollution: Intensity, duration-types of industrial noise-III effects of noise, noise measuring and control, permissible noise limits

Environmental engineering: Unit 12

• Air and water pollution control acts and rules (salient features only), functions of state/ central pollution control boards, environmental management system ISO 14000 (salient features only)

Engineering mechanics-group-A: Unit 01

• Concept of engineering mechanics-statics and dynamics, scalar quality, vector quality, addition and subtraction of vectors, basic units-derived units, SI units, principles of dimensional homogene

Engineering mechanics-group-A: Unit 02

• Definition of a force with explanation-linear representation of force, system of coplanar forces, parallelogram law of forces, composition and resolution, transmissibility of forces, action and reaction, triangle law and polygon law of forces
• Determination of resultant by analytical and graphical method with equal-train space diagram, vector diagram

Engineering mechanics-group-A: Unit 03

• Definition of moment of a force about a point-physical significance of moment, moment of a system of parallel and inclined forces, Varignon’s theorem-definition of moment of a couple, physical significance of couples equivalent couples
• Resultant of any number of coplanar couples, replacement of a force about a point by an equal like parallel force together with a couple, properties of couples

Engineering mechanics-group-A: Unit 04

• Lami’s theorem-triangle law and polygon law of equilibrium-conditions of equilibrium of coplanar system of concurrent forces-conditions of equilibrium of coplanar system of non-concurrent parallel forces (like and unlike)
• Conditions of equilibrium of coplanar system of non-concurrent non-parallel forces (simple problems excluding statically indeterminate)

Engineering mechanics-group-B: Unit 01

• Definition-useful and harmful effects of friction, laws of static friction, coefficient of friction, angle of friction, angle of repose, equilibrium of a body on a rough inclined surface with and without external force

Engineering mechanics-group-B: Unit 02

• Concept and definition-centre of mass, centroid, methods of finding out centroids of simple area by-(i) Geometrical consideration and, (ii) method of moments, finding the centroid of the following areas by any method: Uniform triangular lamina
• Methods of finding out centroids of simple area by-(ii) uniform rectangular lamina, (iii) uniform circular lamina, finding the centroid of the following sections using the method of moment: (i) T-section, (ii) equal and unequal angle-sections
• Methods of finding out centroids of simple area by-(iii) equal and unequal l-sections, iv) different cut-out sections as shown in the following figures

Engineering mechanics-group-B: Unit 03

• Definition and unit; M I of a lamina; theorems of finding out M I by parallel axis theorem and perpendicular axis theorem; radius of Ryratinn; finding out M I of the following sections using formula only-(i) rectangular section, (ii) square section
• Finding out M I of the following sections using formula only-(iii) circular section, (iv) triangular section; M I of irregular areas such as l-sections, T-sections, related simple problems

Engineering mechanics-group-B: Unit 04

• Definition of machine-difference between machine and lever, mechanical advantage, velocity ratio and efficiency with their relationship, frictional effort load, condition of reversibility/ irreversibility, law of lifting machines
• Maximum mechanical advantage, maximum efficiency, effort vs. load curve, efficiency vs. load curve, different types of lifting machine with their mechanical advantage, velocity ratio and efficiency such as wheel and axle (simple and differential)
• Crab winch (single and double purchase), Weston pulley block, worm and worm wheel, simple screw jack

Engineering mechanics-group-C: Unit 01

• Motion equations (with deduction S=Vt, V=u ± ft, S=ut ± 1/2ft², V²=U² ± 2fS) Newton’s second law of linear motion P = mf (deduction)-conservation of momentum of a body, no numerical problems

Engineering mechanics-group-C: Unit 02

• Angular displacement-angular speed, angular velocity, relation between angular speed and angular velocity, angular acceleration, relation between linear and angular velocity, relation between linear and angular acceleration
• Centripetal and centrifugal force (numerical problems)

Engineering mechanics-group-C: Unit 03

• Definitions, units, potential energy (mgh), kinetic energy (1/2 m v²), laws of conservation of energy
• Change of kinetic energy = work done by acting force
• Simple numerical problems

Strength of materials-group-A: Unit 01

• Scope of subjects, use of structure, importance of knowledge of stress, strain and deformation in structure, safety and economy
• Engineering materials: Definitions and examples, mechanical properties of engineering materials: Elasticity, plasticity, ductility, hardness
• Fatigue, creep brittleness (definition, examples, and applications)
• Stress and strain: Tensile, compressive, shear, stress-strain diagram: Principles of tensile testing in universal testing machines showing salient points such as elastic limit, proportional limit, yield points, breaking points, etc, ultimate stress
• Stress-strain diagram: Working stress and factor of safety
• Stress-strain relations: Hooke’s law, Young’s Modulus, Modulus of rigidity, Poisson’s ratio

Strength of materials-group-B: Unit 01

• Definition and types of beams, supports and loads
• Shear force and bending moment in beams: Definitions, sign conventions and inter-relationships, shear force and bending moment diagrams (with simple problems): Cantilever beams with point loads and uniformly distributed loads (DDL)
• Shear force and bending moment diagrams (with simple problems): Simply supported beams with point loads and UDL. Simply supported overhanging beam with point load

Strength of materials-group-B: Unit 02

• Pure bending of beam: Assumptions, deduction of bending equation with usual notations, moment of resistance, section modulus
• Problems on bending stress about axis parallel to the plane of bending: For rectangular circular and l- section

Strength of materials-group-C: Unit 01

• Differential equation of elastic curve-relation among deflection, slope, shear force, bending moment and rate of loading-sign convention of slope and deflection
• Standard formula (no proof, only simple problems) for maximum slope of deflection of cantilever beam subjected to point load at free end, uniformly distributed load on entire span; simply supported beam carrying a point load at mid span
• Uniformly distributed toad on entire span

Strength of materials-group-C: Unit 02

• Definitions of columns and struts-long, medium and short columns, effective length, slenderness ratio, critical load, safe load, different kinds of end conditions, Euler’s formula for critical load (no deduction and no problem)

Soil and water engineering: Unit 01

• Hydrologic cycle, precipitation-forms, rainfall measurement, mass curve, point rainfall, frequency analysis of point rainfall, plotting position, interception, infiltration, evapotranspiration-estimation and measurement, stream number, stream length
• Stream area, stream slope, runoff-factors affecting, measurement of runoff, hydrograph-components, base flow separation, unit hydrograph theory, synthetic unit hydrograph, flood routing-graphical methods of reservoir flood routing
• Flood routing-drought and its classification

Soil and water engineering: Unit 02

• Introduction-classification and basic principles, principle and method of chain surveying, plane table surveying, compass surveying
• Errors in measurements-their elimination and correction
• Leveling, contouring
• Computation of area and volume, Theodolite surveying, traversing, and adjustment of errors

Soil and water engineering: Unit 03

• Definition and properties of fluids, unit measurement, fluid statics, dynamics of fluid flow, Bernoulli’s theorem, Venturi-meter, orifice-meter and nozzle, siphon; laminar flow: Stress- strain relationships, general equation for head loss in pipes
• Laminar flow: Energy losses through pipe fittings, Darcy equation, flow through network of pipes, hydraulic gradient and energy gradient, measurement of discharge through pipes and open channel

Soil and water engineering: Unit 04

• Classification of soil, index properties of soil-void ratio, porosity, density, water content, particle size distribution, consistency limits and permeability, seepage flow-net and drainage, compaction, consolidation
• Earth pressure and retaining structure, shear strength, soil stabilization, soil exploration, stability of slope, foundation engineering

Soil and water engineering: Unit 05

• Mechanics and types of erosion and their causes, estimation of soil loss, biological control measures, stream bank erosion, wind erosion control, design of permanent soil conservation structure: Chute, drop and drop inlet spillways
• Conservation structure: Design of contour bunds, contour trenches, contour stone walls, contour ditches, terraces

Soil and water engineering: Unit 06

• Introduction: Geologic formations, types of aquifer and wells, ground water exploration technique, aquifer properties, aquifer properties, various types of tube wells, hydraulics of well and well performance, installation of well screen, joining of pipes
• Introduction: Completion and development of well, water lifting devices, pump characteristics and pump selection, installation and troubleshooting

Soil and water engineering: Unit 07

• Soil, water, plant relationship, irrigation and drainage for sustainable crop production, land grading and land preparation for irrigation and drainage, design of irrigation channel, water conveyance and control structures, irrigation water requirement
• Methods of irrigation-flood, border, furrow, check basin, sprinkler and drip irrigation systems
• Types of drainage systems and drainage materials

Soil and water engineering: Unit 08

• Simple stress-strain, stress-strain-tension, compressive, shear, stress-strain relationship, elasticity, Hooke’s law, Young’s modulus, modulus of rigidity, Poisson’s ratio, Mohr’s circle, shear force and bending moments diagram, moment of inertia
• Middle third rule, column, and struts

Soil and water engineering: Unit 09

• Definition: History of remote sensing-abroad/ India, concepts of scale, resolution, electromagnetic spectrum: Optical/ microwave, visible region: Blue, green, and red wavelength portion
• Wavelength and frequency: Their relation and units of measurement, polarization; Coherent and incoherent radiation; Doppler effect, energy transmission, atmospheric characteristics, map-definitions, representations
• Point line polygon common coordinate systems

Farm machinery and power: Unit 01

• Climatic zones of West Bengal and its characteristics, classification of crop, effect of different weather parameters on crop growth and development, principles of tillage, tilth and its characteristics, tillage implements
• Conventional tillage, soil, water, plant relationship, crop rotation, cropping systems, mono, double and multiple cropping, sowing, Intercultural operation, harvesting, processing, storage, and protection of crops
• Soil forming rocks and minerals-origin, classification, and composition, weathering of rocks and minerals, soil forming process and the factors, soil profile, soil properties-physical, soil texture, structure, densities, pore spaces
• Chemical properties-pH, soil water composition and classification, soil moisture constants and function, soil air, soil temperature

Farm machinery and power: Unit 02

• Status and scope of farm mechanization, classification and constructional details and principles of operation of manually operated, animal drawn and power operated implements and machinery for primary and secondary tillage, puddling
• Sowing and planting equipment, fertilizer application, description, operation and calibration, inter-cultivation tools, plant protection equipment, principle of crop harvesting and threshing, Chaff cutters and silage filling equipment
• Land development machinery, human engineering and safely in farm machinery, selection

Farm machinery and power: Unit 03

• Power availability on the farms from animate and inanimate sources of energy, their capacities and efficiencies, tractor engine components and their principle of working, engine valve and valve mechanism and valve timing diagram
• Fuel and air supply system, cooling and lubrication system, ignition and starting and electrical system, engine governing, transmission systems of wheel and track type tractors, Clutch and brake, gearbox, differential, PTO
• Belt pulley and draw-bars and final drive mechanisms, power tiller and small farm engines for farm operation, performance and cost analysis of farm tractors and power tillers

Farm machinery and power: Unit 04

• Introduction to conventional and non-conventional energy sources, patterns of fuel consumption, potential of solar, wind, biogas, biomass, geothermal and other renewable energy sources, solar cooker, water heater, drier, solar still
• Solar pond, PV system, etc
• Aerobic and anaerobic bio-conversion process, pyrolysis, gasification and their economics, selection of size of biogas plants, wind energy potential, installed capacity, study of various types of wind mills

Farm machinery and power: Unit 05

• Thermodynamics properties, closed and open system, flow and non-flow processes, gas laws, laws of thermodynamics, internal energy, thermodynamic process of perfect gases, P-V, P-T and T-S diagrams of pure substances, second law of thermodynamics
• Difference between heat and work, cyclic heat engines, Kelvin-Planck and Clausius statements, refrigeration and heat pumps, reversibility and irreversibility of process, boiler performance; boiler efficiency, thermodynamic cycles of IC engines

Food processing and post-harvest engineering: Unit 01

• Micro-organism in deterioration and preservation of food, modes of heat transfer, one dimensional steady-state and unsteady-state heat transfer in simple geometries, Newton’s law of cooling, free and forced convection, correlations
• Heat transfer coefficient, introductory radiation heat transfer, types of heat exchanger, log mean temperature difference, heat exchanger performance, introduction to mass transfer process, Fick’s law, molecular diffusion in fluids and solids
• Convective mass transfer coefficients, mass transfer correlations, processing equipment and machinery, utilization of agricultural by product, unit operation of various dairy and food processing systems; process flow charts for product manufacture
• Manufacture of flavoured milk-cream, butter, condensed milk, ghee, ice cream, etc, beverages-alcoholic and non-alcoholic, carbonated and non-carbonated, working principles of equipment for receiving, pasteurization, sterilization, homogenization
• Filling and packaging, butter manufacture, evaporation, drying, freezing, juice extraction, filtration, process parameters and equipment for various operations-cleaning, sorting and grading, washing, handling, peeling, and slicing
• Blanching, mixing, packaging and storage, cooling and cold storage, drying and dehydration-pre-drying techniques, theory of drying, various types of dryers and their operation, quality changes in dried products, quality control techniques and application

Basic engineering for printing: Unit 01

• Introduction-elasticity, stress, and strain
• Types of stresses: Tensile stress and compressive stress
• Elastic limit-Hooke’s’ law, modulus of elasticity (Young’s modulus) deformation of a body due to force acting on it, simple problems
• Principle of superposition-simple problems on uniform cross-section

Basic engineering for printing: Unit 02

• Different types of mechanical drive and their uses only
• Belt and pulley drive: Different types belt and pulley drive-open belt drive and cross belt drive. Types of belt and types of pulley-velocity ratio. Simple problems

Basic engineering for printing: Unit 03

• Types or gear and then uses
• Definition of different parts of spur gear
• Velocity ratio of spur gear
• Simple problems

Basic engineering for printing: Unit 04

• Types of measuring instruments and their uses
• Description, working principle, care and maintenance of Vernier callipers and outside micrometer
• Reading of vernier callipers and outside micrometer

Basic engineering for printing: Unit 05

• Different types of fastening method with examples
• Types of nuts, bolts, and their uses
• Welding, soldering and brazing and their uses
• Different types of rivet and riveted joints

Printers material science: Unit 01

• Definition of colloid, properties of lyophilic and lyophobic colloids, stability of colloids, protective action of lyophilic colloids, gold number, definition of gel and emulsion, application of colloids, gels and emulsions in printing

Printers material science: Unit 02

• Uses of natural polymers (casein, cellulose, dextrin, egg albumen, gelatine, fish giue, gum Arabic and starch) and synthetic polymers (polyethylene, polypropylene, teflon, polyvinyl acetate, polyvinyl alcohol, polyvinyl chloride, phenolic resin)
• Synthetic polymers (amino resin and polyester resin) in printing

Printers material science: Unit 03

• Constituents of a photographic emulsion, uses of gelatine, preparation of the emulsion, lattice structure of silver chloride and silver bromide, lattice defects, latent image formation by Gurney-Mott theory, chemistry of photographic development, fixing
• Photographic reduction and chemical intensification, chemical reversal, elementary idea of silverless films

Printers material science: Unit 04

• Letterpress and flexography-photo polymeric stereo making, lithography-(graining, coating, developing, etching, lacquering, stencil removing, gumming, desensitizing)-(i) negative working plates-albumen plate, P.S. diazo and photopolymer plates
• Lithography-(i) negative working plates-demographic (waterless) plate, (ii) positive working plates-gum deep etch plate, P.S. plate, diffusion transfer plate, (c) gravure-cylinder making (sensitising, developing, etching, finishing)
• Silk screen-(coating, developing, hardening, stencil removing) direct, indirect, direct, indirect and capillary method