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**M E Subjects – Mechanical Engineering Concepts Simplified**

*Various topics of Mechanical Engineering presented here are in a simple manner. Following courses can be easily understood as it is based on our vast teaching experience:*

- Strength of Materials
- Heat Transfer
- Refrigeration and Air Conditioning
- Thermodynamics
- Fluid Mechanics
- Theory of Machines
- Mechanical Vibrations
- Internal and External Engines
- Engineering Drawing
- Manufacturing
- Multiple Choice Questions on

(i)Strength of Materials

(ii) Heat Transfer

(iii) Refrigeration and Air Conditioning

(iv) Thermodynamics

(v) Fluid Mechanics

(vi)Theory of Machines

(vii) Mechanical Vibrations

(viii) Internal and External Engines

(ix) Engineering Drawing

(x) Manufacturing

(xi) Heat Treatment Processes

**Strength of Materials –**Load, Force, Weight, Types of Loads, Stress, Strain, Unit Stress, Unit Strain, Modulus, Simple and Composite Bodies,Elastic Properties, Stiffness, Poisson’s Ratio, Elastic Constants, Relation between Elastic Constants, Plastic Properties, Yield Strength, Ultimate Strength, Breaking Strength- Gradually Applied Load, Suddenly Applied Load, Impact Load
- Ductile materials, Brittle Materials, Ductility, Malleability, Hardness, Strain Energy, Toughness
- Point Load, Uniformly Distributed Load
- Thermal Stress, Thermal Strain
- Complex Stresses, Principal Stresses, Principal Strains, Principal Planes, Maximum Shear Stress, Planes of Maximum Shear Stress, Angle of Obliquity
- Shear Force Diagram, Bending Moment Diagram, Point of contra-flexure
- Type of beams bending stress, bending strain in simple and composite beams, moment of inertia, section modulus, Moment of Resistance
- Combined Bending and Axial Loading, Middle Third Rule, Middle Quarter Rule
- Shear stresses in a beam
- Slope and Deflection
- Torsion: Stresses/ strains/ strain energy in circular shafts under Torsion/ (Torsion + bending Moment)/ (under Torque+ Bending Moment+ Axial Thrust)
- SPRINGS: Stress/ deflection/ stiffness/ strain energy in Laminated/ Close coiled/ Open coiled springs
- COLUMNS AND STRUTS: Stresses/ strains in Short, Medium and Long Columns, Slenderness Ratio, Buckling of a column, Equivalent length, Rankine formula, Euler formula, Eccentric loading, Eccentricity
- Thin and Thick Walled Pressure Vessels (Cylindrical and Spherical)
- Strain Energy in Tension/ Compression/ Bending/ Torsion
- STIFFNESS: Tension stiffness/ compression stiffness/ bending stiffness/ torsion stiffness ,spring stiffness
**Heat Transfer**– Difference between heat transfer and thermodynamics, Modes of heat Transfer (Conduction, Convection and Radiation )- Fourier Law of Conduction(in Rectangular, Cylindrical and Spherical Coordinates)
- Newton’s Law of Convection
- Stefan’s- Boltzmann Law of Radiation
- Conductive Heat Transfer Coefficient (Thermal Conductivity), Convective Heat Transfer Coefficient, Radiation Heat Transfer Coefficient, Overall Heat Transfer Coefficient
- Practical Applications of Conduction, Convection, Radiation
- Thermal Resistance in Conduction, Convection, Radiation
- Fins and Heat Exchangers: Types of fins and Heat Exchangers, Parallel and Counter-flow Heat Exchangers
- Laws of Radiation, Absorptivity, Reflectivity and Transmissivity, Surface Resistance, Space Resistance, Radiation Shape Factors, Shape Factor Algebra, Radiation Exchange between black and real bodies, Radiation Shields
**Refrigeration and Air Conditioning –**Definition of Refrigeration, Air-Conditioning and Cryogenics, Methods of Refrigeration, Air- Conditioning and Cryogenics, Practical Applications of refrigeration, Air-Conditioning and Cryogenics- Carnot and Reverse Carnot Cycle, Gas Refrigeration Cycle, Reverse Rankine Cycle, Cooling Effect, Heating Effect, Cooling Capacity, Heating Capacity, Work input, Coefficient of Performance
- Pressure – Enthalpy Chart, Temperature-Entropy Chart, Vapor Compression Refrigeration Cycle, Vapor Absorption Cycle, Gas Refrigeration Cycle and its Types, Rate of Refrigerant Flow, Quality of Refrigerant After The Expansion Valve, Volumetric Efficiency
- Steam-Jet Refrigeration, Multi-compressor- Multi-Evaporator Refrigeration, Thermo-electric Refrigeration, Magnetic cooling
- Liquefaction of Air, Oxygen, Nitrogen, Hydrogen and Helium
- Refrigerants (Primary, Secondary, Tertiary, Organic, inorganic and Azeotrope) , Types of Refrigerants
- Compressors, Condensers, Expansion Devices, Evaporators, Pipes, Desiccants, Anti-freezes, Lubricating Oils, Liquid Suction Heat-Exchanger, Accumulator, Oil Separator, Receiver, Solenoid Valve and Defrosting
- Refrigerant and Air –Conditioning Controls-Capillary Tube, Automatic Expansion Valve, Thermostatic Expansion Valve, Low side Float Valve, High Side Float Valve, Thermostat, Low and High Pressure cut-outs and Cut-ins, Low and High Voltage Cut-outs and Cut-ins.

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