B.Tech. (Sixth semester)
ME 302 E Refrigeration and Air-Conditioning
L T P/D Total Theory: 100 Marks
3 1 - 4 Sessional: 50 marks
Duration of Exam: 03 hours
UNIT I
Basics of heat pump & refrigerator; Carnot’s refrigeration and heat pump; Units of refrigeration; COP of refrigerator and heat pump; Carnot’s COP; ICE refrigeration; evaporative refrigeration; refrigeration by expansion of air; refrigeration by throttling of gas; Vapor refrigeration system; steam jet refrigeration; thermoelectric cooling; adiabatic demagnetization.
Basic principles of operation of air refrigeration system, Bell-Coleman air refrigerator; advantages of using air-refrigeration in aircrafts; disadvantages of air refrigeration in comparison to other cold producing methods; simple air refrigeration in air craft; simple evaporative type air refrigeration in aircraft; necessity of cooling the aircraft.
UNIT II
Simple Vapor Compression Refrigeration System; different compression processes( wet compression, dry or dry and saturated compression, superheated compression); Limitations of vapour compression refrigeration system if used on reverse Carnot cycle; representation of theoretical and actual cycle on T-S and P-H charts; effects of operating conditions on the performance of the system; advantages of vapour compression system over air refrigeration system.
Methods of improving COP; flash chamber; flash inter cooler; optimum interstate pressure for two stage refrigeration system; single expansion and multi expansion processes; basic introduction of single load and multi load systems; Cascade systems.
Basic absorption system; COP and Maximum COP of the absorption system; actual NH3 absorption system; functions of various components; Li-Br absorption system; selection of refrigerant and absorbent pair in vapour absorption system; Electro refrigerator; Comparison of Compression and Absorption refrigeration systems; nomenclature of refrigerants; desirable properties of refrigerants; cold storage and ice-plants.
UNIT III
Difference in refrigeration and air conditioning; Psychometric properties of moist air (wet bulb, dry bulb, dew point temperature, relative and specific humidity of moist air, temperature of adiabatic saturation); empirical relation to calculate Pv in moist air.
Psychometric chart, construction and use, mixing of two air streams; sensible heating and cooling; latent heating and cooling; humidification and dehumidification; cooling with dehumidification; cooling with adiabatic humidification; heating and humidification; by-pass factor of coil; sensible heat factor; ADP of cooing coil; Air washer.
UNIT IV
Classification; factors affecting air conditioning systems; comfort air-conditioning system; winter air conditioning system; summer air-conditioning system; year round air conditioning. unitary air-conditioning system; central air conditioning system; room sensible heat factor; Grand sensible heat factor; effective room sensible heat factor.
Inside design conditions; comfort conditions; components of cooling loads; internal heat gains from (occupancy, lighting, appliances, product and processes); system heat gain (supply air duct, A.C. fan, return air duct); external heat gain (heat gain through building, solar heat gains through outside walls and roofs); solar air temperature; solar heat gain through glass areas; heat gain due to ventilation and infiltration.
Transport air conditioning; evaporative condensers, cooling towers; heat pumps.
References and Text books
Refrigeration and air-conditioning by C.P arora
Basic Refrigeration and air-conditioning by Annanthana and Rayanan, TMG
Refrigeration and air-conditioning BY Arora and Domkundwar, Dhanpat rai
NOTE: In the semester examination, the examiner will set 8 questions in all, at least two question from each unit, and students will be required to attempt only 5 questions, at least one from each unit.
B.Tech. (Sixth semester) Mechanical engineering
ME 304 E TRIBOLOGY
L T P/D Total Theory: 100marks
3 1 - 4 Sessional: 50 marks
Duration of Exam: 03 hours
UNIT I
Introduction to trobological systems and their characteristic features; analysis and assessment of surface; topography; deterministic and stochastic tribo-models for asperity contacts; techniques of surface examination; technological properties of surfaces.
Quantitative laws of sliding friction, causes of friction, adhesion theory, laws of rolling friction, measurement of friction
UNIT II
Introduction, mechanism of wear, types of wear, quantitative laws of wear, measurement of wear, wears resistance materials
UNIT III
Introduction, dry friction, boundary lubrication, hydrodynamic, hydrostatic and elasto-hydrodynamic lubrication, functions of lubricants, types and properties, lubricant additives.
Principles, application to rolling contact bearings, cams, Gears
UNIT IV
Geometry and pressure equation of journal bearing, hydrostatic bearings, thrust bearings, porous bearings and hydrodynamic gas bearings. Journal bearings with specialized applications. General requirements and different types of bearing materials.
Suggested Reading
Tribology in Indertrion- By Sushil Kumar Srivastava
Introduction to Tribology of Bearings- By B.C. Majumdar ; A.H.Wheeler
Principles of Tribology – By J. Halling, Macmillan
Mechanics and Chemistry in Lubrication- By Dorinson and Ludema , Elsevier
Friction and wear of Materials- By E. Robinowicz, Johan Wiley
Principles of Lubrication-By A. Cameron, Longmans
NOTE: In the semester examination, the examiner will set 8 questions in all, at least two question from each unit, and students will be required to attempt only 5 questions, at least one from each unit.
B.Tech. (Sixth semester) Mechanical engineering
ME 306 E MECHANICAL VIBRATION
L T P/D Total Theory: 100 Marks
3 1 - 4 Sessional: 50 marks
Duration of Exam: 03 hours
UNIT I
Kinematics of simple vibrating motion, Simple harmonic motions, Vectorial representation of harmonic motion. Degree of freedom, Equations of motions, general solution of free vibration, Phase plane method
UNIT II
Damped free vibration, undamped and damped forced vibrations, Vibrating isolation, Vibrating instruments.
Undamped free vibration ,Principle modes , Influence coefficients, Coordinate coupling, Orthogonality, Vibration absorbers.
UNIT III
Geometric method, Stability of equilibrium points, Method of harmonic balance.
Influence coefficients, Dunkerleys equation, Matrix iteration, Holzer method, Rayleigh method, and Rayleigh-Ritz method.
UNIT IV
Transverse vibration of strings, Longitudinal vibrations of bars, Lateral vibration of beams, Torsional vibration of circular shafts, Whirling of shafts.
Introduction, Method of Laplace transformation and response to an impulsive output, response to step-input, pulse-input, and phase plane method.
REFERENCE AND TEXT BOOKS: -
Mechanical vibration - By G.K. Grover; Nemchand Chand and Sons
Mechanical Vibration – By Thomson; Prentice Hall
Mechanical Vibration - By Den Hartog; Mc Graw Hill
Introductory course to mechanical vibrations – By Rao and Gupta; Wiley Eastern
NOTE: In the semester examination, the examiner will set 8 questions in all, at least two question from each unit, and students will be required to attempt only 5 questions, at least one from each unit.
B.Tech. (Sixth semester) Mechanical engineering
ME 308 E COMPUTER AIDED DESIGN AND MANUFACTURING
L T P/D Total Theory: 100 Marks
4 1 - 5 Sessional: 50 marks
Duration of Exam: 03 hours
UNIT I
Introduction to CAD/CAM, Historical Development, Industrial look at CAD/CAM, Introduction to CIM Basic of Geometric & Solid modeling, Coordinate systems, Explict, Implict, Intrinsic and parametric equation
Part families, Part classification and coding, product flow analysis, Machine cell Design, Advantages of GT
UNIT II
Introduction, Transformation of points & line, 2-D rotation, Reflection, Scaling and combined transformation, Homogeneous coordinates, 3-D scaling, shearing, rotation, reflection and translation, combined transformations, Orthographic and perspective projections
Algebric and geometric forms, tangent & normal blending functions, re parametrization, Straight line, conics, cubic splines, Bezier curves and B-spline curves
UNIT III
Algebraic and geometric forms, tangent & twist vectors, normal blending function, reparametrization, Sixteen point form, four Curve form, Plane surface, ruled surface
Surface of revolution, tabulated cylinder Bi-cubic surface, bezier surface, B-spline surface
Solid models and representation scheme B-rep & CSG, sweep representation ,Cell decomposition, spatial occupancy enumeration
UNIT IV
Introduction, fixed programmable and flexible automation, Types of NC systems, MCU & other components, Co-ordinate system, NC manual part programming, G & M codes, part program for simple parts, Computer assisted part programming
Introduction, FMS component, Types of FMS, FMS layout, Planning for FMS, advantage and applications
Introduction, conventional process planning, Steps in variant process planning, types of CAPP, planning for CAPP
Suggested Reading
CAD/CAM theory & practice (Ibrahim Zeid)
CAD/CAM (Groover & Zimmer)
Numerical control and computer aided manufacturing by RAO and Tiwari, Tmg
NOTE: In the semester examination, the examiner will set 8 questions in all, at least two question from each unit, and students will be required to attempt only 5 questions, at least one from each unit.
B.TECH. (SIXTH SEMESTER) MECHANICAL ENGINEERING
ME 310 E MACHINE DESIGN II
L T P/D Total Theory: 100Marks
2 - 6 8 Sessional: 50 marks
Duration of Exam: 04 hours
UNIT I
Classification of Gears; Selection of type; Law of Gearing, Standard system of Gear tooth, VariousFailure modes, Interference, undercutting & minimum no. Of teeth
Force Analysis ,Beam strength of Gear tooth, Effective load on tooth, Estimation of module based on beam strength and wear strength, Gear lubrication, materials; Design Procedure, Gear Box design
Terminology, Force Analysis, Virtual no. of teeth, Beam strength, Effective load, Wear strength
Terminology, force analysis, beam strength & wear strength, effective load on gear tooth
Terminology, properties, force analysis, friction, material selection
UNIT II
Design of flat belts &Pulleys, Design /selection of V belts &Pulleys, Design/selection of wire ropes, Design/selection of chains
Single &multiple Plate clutch, Cone clutch
External shoe brake, Internal shoe brakes
UNIT III
Coil Springs, Leaf Springs
Hydro dynamically lubricated bearings, Selection of ball bearings, Selection of roller bearings, Selection of taper roller bearings
Mechanism Design, Design of cam & Follower
UNIT IV
Design of Cylinder, Design of Piston, Design of Crank shaft, Design of connecting rod
Design of Cylinder, Design of Piston, Design of Crank shaft, Design of connecting rod
Design of Crane Hook
Design of Flywheels
SUGGESTED READING
Design of Machine Elements Bhandari TMH
Machine Design Sharma Aggarwal Katson Publishers
PSG Design Data Book PSG College
Machine Design an integrated Approch Robert l Norton, prentice hall
Fundamental of machine component design R.C Juvinnal, Johan wiley& sons
NOTE: In the semester examination, the examiner will set 8 questions in all, at least two question from each unit, and students will be required to attempt only 5 questions, at least one from each unit.
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