LET Coaching

LET is intended to admit meritorious Diploma holders to the Second Year/Third Semester of the B.Tech courses to acquire a Degree in Engineering.


Lateral Entry Scheme is intended to admit meritorious Diploma holders to the Second Year/Third Semester of the B.Tech courses to acquire a Degree in Engineering. Lateral Entry Scheme is approved by Government of Kerala as per G.O (Ms) No.156/2002/H.Edn dated 13.11.2002 for 10% of the sanctioned seats in addition to total seats. In order to maintain uniformity among various schemes of Diploma holders, AICTE has suggested a state level Entrance Examination for the selection. The list of various Engineering Institutions, the courses/ branches offered and the number of seats available in each branch will be published in the website - www.dtekerala.gov.in.


For English, out of the 10 marks to be awarded, 5 marks will be for questions based on a given passage and remaining 5 marks for basic Grammar and General English of +2 Standard.


Inverse of Matrix-Linear dependence and independence Vectors- Consistencyand inconsistency of a system of linear equations-Rank of a matrix. Eigen Values andEigen Vectors-Properties-Caylay-Hamilton Theories Diagonalisation-Quadarticforms-Reduction to canonical forms. Differential Calculas: Successive Differentiation-Leibnitz Theorem-Indeterminate forms- L’Hospital’s Rule-Radius of curvature-center of curvature-Evolutes partial Differentiation-Homogeneous functions Euler’s Theorem-Maxima and Minima oftwo variables. Infinite Series:Notions of Convergence and divergence-Comparison test-Ratio test-Cauchy’sRoot test-Test for alternating series-absolute convergence. Fourier Series:Even functions ,Odd functions , periodic functions-Dirichelet’s condition- Euler’s formula . Functions with period 2π and 2l . Half range sine and cosine series.Laplace transforms – properties-Inverse Transforms.


Units-Dimensions-Vector & scalar quantities-laws of mechanics –Elements of vector algebra-Principals of statics –freebody diagram –composition & resolution of & equilibrant – concurrent forces –tringular forces –Lami’s theorems – center of gravity– Moment of inertia – Coplannar forces –Friction. Plane trusses – Different types of support – Reaction at supports – Methods ofsections – funicular polygen – Maxwells diagram – couples in space – Equilibriumof general system of force in space. Kinematics of a particle – simple relative motion –definition of particle –velocity and acceleration – transaction and rotation – rectangular and cylindrical coordinates –particle dynamics –central force motion. Principles of dynamics – motion of a particle acted by a constant force as a functionof time- Force proportional to displacement –free vibrations –D’ Alemberts principle– Momentum and impulse – work and energy –Ideal system –Conservation of energy– impact – curvilinear motion – Projectiles –Rotation –Torsional vibration –Simple and compound pendulam –Collision of bodies.


1. computer organization:- Central processing unit , input device , output device ,secondary storage device , machine language , assembly language and highlevel language 2. System software:- Assembler , loader ,linker , operating system , editors ,,compilers , debuggers. 3. Computer programming ( in C language ):- Data types, type conversion,simple and compound statements, usage of standard library, control structures,functions , arrays. Pointers , structure, file handling. 4. Data base systems:- Relational Data Base Management System ,SQL. 5. Multimedia:- Multimedia hardware, sound cards, CD ROMs, full motiondigital video. 6. Computer networks:- ISO/OSI protocols ,TCP/IP, Inter connecting networkdevices , Ethernet cards,cables, Connectors, hubs, switches, routers 7. Internet:- Introduction to FTP,TELNET, Email , web browsers and webservers.


Materials- cement-steel- aggregates- mortar preparation- concrete- grades of concretewater-cement ratio-Workability-batching-Mixing-Compaction-Curing-Strengths inconcrete-Timber-Defects of timber- Seasoning-Bricks-Varieties. Selection of site of a building –Setting out- Excavation –Types of foundation-Bearingcapacity masonry- Materials- Types –Stone Masonry-Brick masonry-Bond in Brick-Special bricks-Arches Cavity walls-Hollow block-Plastering-Painting. Doors-Windows-Flooring-Preparation of bed- Laying floor finish-Various floor finishmaterials-Roofs – Different types- Roof covering materials- Precast and ssedconstruction. Methods of surveying- Chain –Compass-Plane table odolite- Areal –Hydrographic – Measurement of distance –elementary idea of total station –Errors in chaining –Tape correction- Setting out right angles –Leveing- Types of levels-Reduction of level- Computation of area and volume –Trapezodial and Simpsons rule.


Thermodynamics:Definitions and basic concepts- system, properties, state, process, cycle – heat and work –Thermodynamic equilibrium. Zeroth law of thermodynamics – concept of temperature – temperature scales. First law of thermodynamics – concepts of internal energy and enthalpy. Second law of thermodynamics- Clausius and Kelvin –Plank statements- concept reversibility,availability and entropy. Thermodynamicprocesses- constant volume, constant pressure, isothermal, adiabatic, polytropicprocesses, throttling and free expansion, p-v and T-s diagrams- work done, heatexchanged,change in entropy, and change in internal energy during the aboveprocesses. Air cycles- Carnot, Otto and Diesel cycles- air standard efficiency.Working and comparison of two stroke and four stroke petrol and diesel engines various systems- air systems, fuel system, ignition system, governing system. Steam Boilers and turbines:Properties of steam- dryness fraction, enthalpy, entropy. Classification of boilers,Boiler mountings and accessories. Types of steam turbines- impulse and reaction type– parts of turbines, compounding of turbines.
Pumps:Types – Centrifugal, reciprocating, gear and jet – applications- criteria for choice ofpumps. Refrigerations and Airconditioning:Simple vapour compression and vapour absorption refrigeration syatems –Refrigerants. Psychrometry- definitions of terms, Air conditioning – parts of an A/C unit Mechanical power transmission systems:Belt drive-parts. Different types- rope drive, chain drive-types, gear drives – types –spur, helical, herring bone, bevel, spiral, skew, hypoid, worm and wheel, rack and pinion. Velocity ratio, comparison and fields of application. Gear trains- simple,compound and epicyclic. Manufacturing processes:Primary, secondary and tertiary production processes- moulding, sand casting, die casting, forging, punching, blanking, stanping, coining, rolling, extrusion, wiredrawing, turning, boring, thread cutting, tapping, shaping, drilling, milling, reaming,grinding, broaching, honing, lapping, welding, soldering and brazing.


SI unit of current, voltage, power and energy – Ohm’s law- temperature coefficient of resistance- Kirchoff’s law- solution of series, parallel circuits- Star Delta transformation-magnetic circuits-flux- flux density- mmf-magnetizing force Reluctance- permeability- comparison of Electric and Magnetic circuits – Magnetic leakage-B.H. characteristics- solutions of series and parallel magnetic circuits- force experienced by a current carrying conductor in a magnetic field- Electromagnetic induction- Faraday;s laws- Lenz’s Law- statically induced emf- Dynamically induced emf self and mutual induction- coefficient of coupling
Alternating current fundamentals- Generation of alternating currents- wave formsfrequency-period- average value and form factor . Phasor representation of alternating quantities rectangular and polar form- Analysis of simple ac circuits with resistance inductance and capacitance- concept of impedance and admittance- power and power factor in ac circuits- active and reactive components- solution of RL, RC,and RLC circuits- series, parallel and series parallel circuits- Resonance-Q factorselectivity and bandwidth. Electrical Drives- Principles of operation of ac and dc motors –mechanical characteristics and application of dc series, shunt and compound motors-single phase and three phase induction motors – synchronous motors-Transformer-Principle of operation-emf equation- Ideal transformer- constructional detals- losser and efficiency- Use of power, distribution and instrument transformers. Different methods of wiring for LT installations. Schematic layout of LT switch boards- Earthing of installation – necessity of earthing- plate and pipe earthing – Protective fuses, MCBs, ELCB- Tariffs- Types of LT and HT consumers. Characteristics of different types of lamps- vapour lamps- incandescent lamps- energy efficient lamps- control accessories of vapour lamps.Storage batteries- Lead acid and Nickel Cadmium batteries – constructioncharacteristics-charging and discharging- spesification – maintenance. Methods of bulk generation of electric power , Block schematic layout of generating station – hydro electric, thermal, nuclear, stations- Non conventional energy sourcessolar,tidal, wind- Economics of generation-load factor- diversity factor –diversity factor – plant factor.
Bulk transmission of electric power –typical power transmission scheme-need for high transmission voltage- substation- substation equipment, primary and secondary transmission and distribution systems- effect of power factor ,transmission voltages in Kerala.


1.Passive components: Resistors – types, color coding, power rating ,Capacitors –types , color coding, Voltage rating, Inductor and Transformers: types
2.Semiconductors: Crystalline structure – Intrinsic And Extrinsic semiconductors , PNjunctions , Electrical characteristics.
3.Diodes: Biasing , Rectifier Circuits.
4.Transistors: NPN and PNP transistors , current flow in a transistor – transistor configuration , FET, Zener diods, SCR . photodiods , phototransistors, LED.
5.Amplifiers: The CE, CB and CC amplifiers, Frequency response, and power amplifier – single ended power amplifier , push pull amplifier.
6.Oscillactor: Feedback principles, RC and LC Oscillators
7.Digital circuits: Logical states, Number codes, Gates and truth tables. TTl and CMOS logic identifiers, Function minimization, uliplexer, Demultiplexer, Decoders,Flip-Flops, RS, Jk, Master slave JK,D and T, Counters, Shift registers, AdCS.
8.Electronic communication: Modulation- AM, FM, Demodulation, Radio- receviers,Transmitters , Television Radar.
9.Elctrinic Instrumentation: Measurement of current ,voltage and power, cathode ray oscilloscope, Transducers – strain gauges, Thermocouples, thermistors, RTDS,LVDTs.


Candidates who have passed Diploma in Engineering/ Technology awarded by the State Board of Technical Education, Kerala or Equivalent after undergoing regular course of 3 years in an approved institution are eligible for writing the Entrance Test. All candidates should produce a certificate showing the duration of the course and the details of the certificate issuing authority properly authenticated by the head of institution concerned, in the space provided in the body of the application form. Candidates having Diploma not issued by the State board of Technical Education, Kerala should produce an Equivalency Certificate issued by the Director of Technical Education, Kerala along with the application. Candidates who have passed Diploma Examination through Lateral Entry / Distance Education of other State boards/ Universities are not eligible for writing the Entrance Test. Those who are appearing for the final year Diploma Examination are also eligible to apply subject to the condition that they will produce the Qualifying Certificate (Original or Provisional) at the time of Admission


A State level OMR based objective type Entrance Test for duration of 2 hours will be conducted. The Entrance Test will be on selected subjects of first year B.Tech course and English language as per the scheme and syllabus.

0487 6500132


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