Mechanical Engineering Paper II Syllabus

Paper – II

1. Thermodynamics, Gas Dynamics and Turbine:

  • Basic concept of First –law and second law of Thermodynamics; concept of entropy and reversibility; availability and unavailability and irreversibility.
  • Classification and properties of fluids; incompressible and compressible fluids flows; effect of Mach number and compressibility; continuity momentum and  energy equations; normal and oblique shocks; one dimensional isentropic flow; flow or fluids in duct with frictions that transfer.
  • Flow through fans, blowers and compressors; axial and centrifugal flow configuration; design of fans and compressors; single problems compresses and turbine cascade; open and closed cycle gas turbines; work done in the gas turbine; reheat and regenerators.

2. Heat Transfer:

  • Conduction heat transfer- general conduction equation – Laplace, Poisson and Fourier equations; Fourier law of conduction; one dimensional steady state heat conduction applied to simple wall, solid and hollow cylinder & spheres.
  • Convection heat transfer- Newton’s law of convection; free and forces convection; heat transfer during laminar and turbulent flow of an incompressible fluid over a flat plate; concepts of Nusselt number, hydrodynamic and thermal boundary layer their thickness; Prandtl number; analogy between heat and momentum transfer- Reynolds, Colbum, Prandtl analogies; heat transfer during laminar and turbulent flow through horizontal tubes; free convection from horizontal and vertical plates.
  • Black body radiation – basic radiation laws such as Stefan-Boltzman, Planck distribution, Wein’s displacement etc.
  • Basic heat exchanger analysis; classification of heat exchangers.

3. I .C. Engines:

  • Classification, thermodynamic cycles of operation; determination of break power, indicated power, mechanical efficiency, heat balance sheet, interpretation of performance characteristics, petrol, gas and diesel engines.
  • Combustion in SI and CI engines, normal and abnormal combustion; effect of working parameters on knocking, reduction of knocking; Forms of combustion chamber for SI and CI engines; rating of fuels; additives; emission.
  • Different systems of IC engines- fuels; lubricating; cooling and transmission systems. Alternate fuels in IC engines.

4. Steam Engineering:

  • Steam generation- modified Rankine cycle analysis; Modern steam boilers; steam at critical and supercritical pressures; draught equipment; natural and artificial draught; boiler fuels solid, liquid and gaseous fuels. Steam turbines – principle; types; compounding; impulse and reaction turbines; axial thrust.
  • Steam nozzles- flow of steam in convergent and divergent nozzle; pressure at throat for maximum discharge with different initial steam conditions such as wet,
    saturated and superheated, effect of variation of back pressure; supersaturated flow of steam in nozzles, Wilson line.
  • Rankine cycle with internal and external irreversibility; reheat factor; reheating and regeneration, methods of governing; back pressure and pass out turbines.
  • Steam power plants – combined cycle power generation; heat recovery steam generators (HRSG) fired and unfired, cogeneration plants.

5. Refrigeration and air-conditioning:

  • Vapour compression refrigeration cycle – cycle on p-H & T-s diagrams; eco-friendly refrigerants – R134a,123; Systems like evaporators, condensers, compressor, expansion devices. Simple vapour absorption systems.
  • Psychrometry – properties; processes; charts; sensible heating and cooling; humidification and dehumidification effective temperature; air-conditioning load  calculation; simple duct design.

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