23-Mechanical Engg.

Question 1

1. Mechanics :

Answer 1

1.1 Mechanics of Rigid Bodies :Equations of equi1ibrium in space and its app1ication;first and second moments of area; simple problems on friction;kinematics of partic1es for plane motion; elementary partic1edynamics.1.2 Mechanics of Deformable Bodies :Genera1ized Hooke’s Jaw and its app1ication; designproblems on axial stress, shear stress and bearing stress;material properties for dynamic loading; bending shear andstresses in beams; determination of principle stresses andstrains-analytical and graphical; compound and combinedstresses; bi-axial stresses-thin wa11ed pressure vessel;materia] behaviour and design factors for dynamic ]oad;design of circular shafts for bending and torsiona11oad only;deflection of beam for statica11y determinate problems; theoriesof failure.MECH. ENGG 1

Question 2

2. Engineering Materials :

Answer 2

Basic concepts on structure of solids, common ferrousand non-ferrous materials and their applications; heattreatmentof steels; non-metalsplastics, cermics, compositematerials and nano-materials.MECH ENGG 2

Question 3

3. Theory of Machines :

Answer 3

Kinematic and dynamic analysis of plane mechanisms.Cams, Gears and empicyclie gear trains, flywheels, governors,balancing of rigid rotors, balancing of single and multicylinderengines, linear vibration analysis ofmechanical systems(single degree of freedom), Critical speeds and whirling ofshafts.MECH ENGG 3

Question 4

4. Manufacturing Science :

Answer 4

4.1 Manufacturing Process:Machine tool engineering - Merhant’s force analysis:Taylor’s tool life equation; conventional machining; NC andCNCmachining process; jigs and fixtures.Non-conventional machining-EDM, ECM, ultrasonic,water jet machining etc.; application of la~ers and pl asmas;energy rate calculations.Forming and welding processes-standard processes.Metrology-concept of fits and tolerances; tools andguages; comparators; inspection of length ; position; profileand surface finish.4.2 Manufacturing Management:System design: factory location-simple OR models;p]ant layout-methods based; applications of engineering economic analysis and break-even analysis for product selection,process selection and capacity planning;predetermined timestandards.System planning; foreca~ting methods based onregression and decomposition, design and blancing of multimodel and stochastic a~sembly lines; inventory managementprobablisticinventory models for order time and orderquanitity determination; HT systems; strategic sourcing;managing inter plant logistics.System operations and control: Scheduling algorithmsfor job shops; applications of statistical methods for productand process quality control applications of control charts formean, range, percent defective, number of defectives anddefects per unit; quali ty cost systems; management ofresources, organizations and risks in projects.System improvement: Implementation of systems,such a~ total quality management, developing and managingflexible, lean and agile Organizations.MECH ENGG 4

Question 5

1. Thennodynamics, Gas Dynamics Turbine:

Answer 5

11 Basic concept of First-law and Second law ofThermodynamics; concept of entropy and reversibility; availability and unavailability and irreversibility.12 Classification and properties of fluids;incompressible and compressible fluids flows; effect of Machnumber and compressibility; continuity momentum andenergy equations; normal and oblique shocks; onedimensional isentropic flow; flow or fluids in duct withfrictions that transfer.13 Flow through fans, blowers and compressors; axialand centrifugal flow configuration; design of fans andcompressors; single problems compresses and turbinecascade; open and closed cycle gas turbines; work done inthe gas turbine; reheat and regenerators.MECH. ENGG 5

Question 6

2. Heat Transfer :

Answer 6

21 Conduction heat transfer-general conductionequation-aplace, oisson and Fourier equations; Fourierlaw of conduction; one dimensional steady state heatconduction applied to simple wall, solid and hollow cylinderand spheres.22 Convection heat transfer-Newton’s law of convection; free and forces convection; heat transfer duringlaminar and turbulent flow of an incompressible fluid over aflat plate; concepts of Nusselt number, hydrodynamic andthermal boundary layer their thickness; Prandtl number;analogy between heat and momentum transfer-Reynolds,Colburn, Prandtl analogies; heat transfer during laminar andturbulent flow through horizontal tubes; free convection fromhorizontal and vertical plates.23 Black body radiation-basic radiation laws such a’Stefan-boltzman, Hhck distribution, Wu!i displacementetc.24 Basic heat exchanger analysis; cla,sification ofheat exchangers.MECH. ENGG 6

Question 7

3. Engines:

Answer 7

31 Cbssification, themodynamic cycles of operation;determination of break power, indicated power, mechanicalefficiency, heat balance sheet, interpretation of performancecharacteristics, petrol, gas and diesel engines.32Combustion in Sl and Cl engines, normal and abnormal combustion; effect of working parameters on knocking, reduction of knocking; Forms of combustionchamber for Sl and Cl engines; rating of fuels; additives;emissiOn.33Different systems of lC engines-fuels; lubricating;cooling and transmission systems. Alternate fuels in lCengines.MECH. ENGG 7

Question 8

5. Refrigeration and Air-conditioning :

Answer 8

5.1 Vapour compression refrigeration cycle-cycle onp-H & T-s diagrams; ecofriend1y refrigerants-R 134a. 123;Systems like evaporators, condensers, compressor, expansiondevices. Simple vapour absorption systems.5.2 Psychrometry-properties; processes; charts; sensib1e heating and coo1ing; humidification and dehumidification effective temperature; air-conditioning ]oad ca1cu1ation; simp1e duct design.MECH. ENGG 9