Important Topics to prepare for GATE 2018 Mechanical Engineering Paper

Transcription

1 Important Topics to prepare for GATE 2018 Mechanical Engineering Paper In GATE Mechanical Engineering Paper, few subjects are having more weight age of marks than other subjects. So it is necessary for you to know the important topics where the questions have been asked regularly in the previous GATE papers. Based on the analysis of previous GATE exam papers, most important topics are provided below. Manufacturing Maximum weightage topics in previous GATE: Orthogonal cutting, Tool life equation problems. Regularly covered topics in previous GATE: Casting types and design of castings, Riser and Gate design of casting, Resistance welding, Problems on welding. Easy level topics in GATE: Limits fits and tolerances, Metrology measuring, Non-traditional machining, CNC programming. Thermal Sciences Difficult level topics in GATE: Second law and First law problems, Steam turbines, Availability. Maximum weightage topics in previous GATE: Laws of TD, Properties. Regularly covered topics in previous GATE: Problems on Diesel, Otto, Dual cycle, Detonation and Knocking, turbomachinery Fluid Mechanics Maximum weightage topics in previous GATE: Velocity potential, Flow through Pipes, Boundary layer theory. Easy level topics in GATE: Buoyancy, Surface tension, Capillary, Applications of Bernoulli equation. Difficult level topics in GATE: Centrifugal pumps, Specific speeds of turbine and pumps, Unit quantities of turbines and pumps.

2 Heat Transfer Maximum weightage topics in previous GATE: Numbers in convection like Pr No, Gr No, Re No, etc. Regularly covered topics in previous GATE: Problems on conduction, Critical thickness, Shape factor in radiation, Problem in Heat exchangers like Ntu. Theory of Machines & Vibration Regularly covered topics in previous GATE: Pairs and its applications, Linkages, Inversions of single and double slider crank, Free damped vibrations Difficult level topics in GATE: Planetary gear train, Gears LOC, POC. Easy level topics in GATE: Shafts problems, Governors and Flywheel. Industrial Engineering Difficult level topics in GATE: LPP. Maximum weightage topics in previous GATE: Queuing theory, EOQ problems, Inventory control. Engineering Mechanics Important topics & Regularly covered topics in GATE: Structural analysis, Work and Energy, Law of Restitution Engineering Materials Regularly covered topics in previous GATE: Effect of Alloying elements, Defects in the crystal structure. Easy level topics in GATE: Heat treatment. Strength of materials Important topics & Regularly covered topics in GATE: Stress and strain, Deflections, SF & BM, Bending stress.

3 Machine Design Important topics & Regularly covered topics in GATE: Joints, Design of gears, and bearings Engineering Mathematics Every topic from this subject is very important. This subject is a scoring one. One should not leave any topic from this subject as all the questions asked from this subject are having the same level. Engineering Mathematics by Grewal textbook covers all the topics. Solve all the examples of the book along with previous GATE papers. General Aptitude Important topics covered in GATE: o Sentence completion and word analogies o Numerical computation and data interpretation

4 This was the successful roadmap. (1) ENGINEERING MATHEMATICS This constitutes 15% of the total marks of the paper. Problems on finding rank of matrix, type of solution (unique, infinitely many etc.), simple integration (using Trapezoidal, Simpson s 1/3rd rule etc.), Simple formula based Laplace Transforms, simple probability distributions (normal, poisons, binomial distribution, uniform distribution ), directional derivatives, divergence, curl, simple dice problems, limits, simple PDE are all common. (2) MECHANICS, SOM This constitutes marks of your paper. You can find simple FBD problems (just 1) for finding force, conservation of momentum, block and slope type (average stress and maximum stress for different sections like rectangle,triangle etc.), Macaulay s theorem (slope & deflection), one question on thin pressure vessels, problems on various theories of failure, torques, and bending moment calculation, truss. (3) DESIGN OF M/C ELEMENTS, TOM This chapter makes up a huge chunk of your marks 15 to 20! Expect one problem on (Goodman or Soderberg or Gerber Criteria), bearings (life) calculation, torsion of a bar, loading on a plate with bolts, strain energy, S-N curve, degrees of freedom, output velocity calculation of mechanism, relative velocity approach, Instantaneous Centre Method, clutch power, brake power, belt drive, conceptual questions on D.O.F. of mechanisms, simple gearing ratio problems on spur gears, type of mechanism (based on link lengths), simple spur gear main, quick return mechanism, mobility. (4) VIBRATIONS Questions on vibration account for 2-4 marks. You will find questions on simple single D.O.F, finding natural frequencies (underdamped, critically damped, overdamped) (5) FLUID MECHANICS This chapter accounts for 5-10 marks. Expect questions on simple & differential piezometer, pressure column height calculation, Reynold s no. calculation, hydraulic power,nozzle velocity etc. of turbines, continuity equation, Bernoulli s law (simple problems), tapered sections, pump parameters (speed, power, discharge), gates(of dams) force calculation, venturimeter, laminar flow.

5 (6) THERMAL SCIENCE This is another chapter that accounts for 5-10 marks. Problems asked are usually based on Rankine Cycle, Brayton Cycle, Regeneration in steam cycles, and other cycles, T-S diagrams, P-V diagrams, enthalpy calculations, C.O.P., ŋ, parameters of I.C. engine (power, volume capacity, stroke, ŋ, brake power), DBT(Dry Bulb Temp.), WBT(Wet Bulb Temp.), ŋ relations (otto,diesel cycles), work done, exit temperature in various stages of cycles, pressure of nozzle, compressor work calculations. (7) HEAT TRANSFER 5-10 marks are generally allotted to this chapter. Make sure to study convection, conduction, radiation, Efficiency calculation, heat exchanger (parallel & counter flow) outlet temp. calculation, biot number, Prandtl number, LMTD, Heat transfer through slabs, shells,cylinders, condenser, view factor, unsteady cooling. (8) MANUFACTURING SCIENCE This is a monster chapter. It accounts for marks. Expect formula based problems on machining (milling, drilling, EDM, ECM) machining time, current, tool geometry, punching, blanking, force; conceptual & theoretical questions; orthogonal machining, heat & power required in welding, transformations (rotations, scaling etc.), solidification time, CNC machine G codes and M Codes, sheet metal, various types of fits, clearance calculation, arc welding. (9) INDUSTRIAL ENGINEERING of the total marks are usually from this chapter. Be prepared with forecasting model, CPM, PERT, depreciation, cost (labour, tool grinding cost, waiting cost etc.), P- chart, C-chart, R-chart, X-chart, Time study, EOQ, standard time, demand, Poisson s arrivals & departures, LPP problems (graphical), simplex method, GO, NO-GO gauges, Machine allocation problems, Sequencing problems, EDD, SPT rule (scheduling) etc. Use this guide to plan the studies. Also, do not forget to prepare for General Aptitude, which not only carries 15% of the marks but are also filled with sitters that prove to be scoring. Concentrate on covering high-weightage + easy chapters first.

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