WITH EFFECT FROM THE ACADEMIC YEAR 2011 - 2012

ME 223

PRINCIPLES OF MECHANICAL ENGINEERING

Instruction                                                 4              Periods per week

Duration of University Examination    3              Hours

University Examination                          75            Marks

Sessional                                                   25            Marks

UNIT-I

Laws of Thermodynamics : Steady flow energy equation-conditions of reversible and irreversible process-Modes of Heat transfer-conduction and convection, radiation - concept of black body radiation - steady state conduction - Heat transfer through plane walls, cylinders, critical radius of insulation for cylinders.

Heat Exchanger : Classification, Industry applications, LMTD calculations, parallel and counter flows.

Refrigeration System : Types, co-efficient of performance and ton, SVC & air refrigeration and properties of refrigerants, eco friendly refrigerants, Psychometric Processes for summer and winter A/c only.

UNIT-II

Principles of IC Engines : Petrol and Diesel, 2 stroke / 4 stroke and load characteristics, compressors - concept of multi stage compression, Types, load characteristics, Calculation of mechanical and thermal efficiencies.

Generation of steam : Boilers - Gas Turbines - types - classification - constant pressure.

UNIT-III

Gears : Classification, Gear trains, types - Single, compound, Inverted & Epi cyclic gear trains, Belt & rope drives, open and cross belt, length of belt, ratio of tension flat belts, condition for maximum power.

UNIT-IV

Introduction to Bernoulli's equation, applications - Venturi meter, Orifice meter, Flow through pipes - Hagen's formula, Friction loss in pipes, Darcy's formula, Reynolds number and its significance.

Hydraulic Turbines : Classification - working principle - Francis, Kaplan, Pelton Wheels, Work done, power output, efficiency, specific speed, Unit quantities, Draft Tube, Performance characteristic curves.

UNIT-V

Pumps : Working principles and construction details of Centrifugal and reciprocating pumps, Effect of friction, acceleration head, work done, power required with and without air vessels, Problems faced in pumps, precaution, cavitation, primary velocity triangles of centrifugal pumps.

Suggested Reading :

1. 1.R.K. Rajput, Thermal Engineering, Laxmi Publications, 2005.

1. 2.Thomas Bevan Theory of Machines, CBS Publishers, 1995.

1. 3.Yadav, Steam and Gas Turbines, Central Publishing House Ltd., 2004.

S. Ramamrutham, Hydraulic Machines, Dhanpat Rai and Sons, 2004.