WITH EFFECT FROM THE ACADEMIC YEAR 2011 - 2012
ME 221
ELEMENTS OF MECHANICAL ENGINEERING
(For ECE)
Instruction 4 Periods per week
Duration of University Examination 3 Hours
University Examination 75 Marks
Sessional 25 Marks
UNIT-I
Thermodynamics: Concept of system, process and properties, laws of thermodynamics, concept of entropy and Clausius inequality, steady flow energy equation for an open system.
IC Engines: Working of four stroke and two stroke petrol and diesel engine with p-V diagrams, valve timing diagram, calculation of indicated power, brake power, specific fuel consumption, mechanical and thermal efficiencies.
Reciprocating Air compressors: workdone, efficiency of multistage compressors, effect of clearance volume.
UNIT-II
Heat transfer: Basic modes of heat transfer, Fourier’s law of conduction, Newton’s law of cooling, Stefan-Boltzamn law of radiation and one dimensional steady state conduction heat transfer through plane walls without heat generation.
Heat exchangers: Classification and application of heat exchangers in industry, derivation of LMTD in parallel and counter-flow heat exchangers and problems
UNIT-III
Refrigeration: Types of refrigeration systems- Air refrigeration system, vapor compression system, ammonia-water absorption refrigeration system ,thermoelectric refrigeration system, COP and representation of cycle on T-S and H-S diagrams, Types and properties of refrigerants, eco-friendly refrigerants., Introduction to psychometry and psychometry processes
UNIT-IV
Basic Manufacturing Processes: Welding, brazing, soldering, brief description of process and parameters, associated principles of gas welding, arc welding.
Casting: Sand casting, die casting, and principles and application Forming: Basic concepts of forming processes: Extrusion, rod/wire drawing, Forging and Rolling.
Principles and Applications of basic Machining Processes: Turing, milling and grinding.
UNIT-V
Definition of kinematic link and pair, mechanism and machine. Gears: Classifications of gears, nomenclature Gear Trains: Simple, compound, inverted and epi-cyclc gear trains
Belt and Rope drives: Open and cross belt drives, length of belt, ratio of tensions of flat belt, condition for maximum power transmission for flat belt.
Suggested Reading:
- 1.R.K. Rajput, Thermal Engineering, Laxmi Publications, 2005
- 2.C. Sachdeva. Fundamentals of Engineering Heat and Mass transfer, Wiley Eastern ltd, 2004.
- 3.P.N. Rao, Manufacturing Technology, Vol. 1 & 2, Tata McGraw Hill publishing co, 2010.
- 4.Thomas Bevan Theory of Machines, CBS Publishers,