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Thursday, 5 January 2012

Important topics in Mechanical Engineering asked during GATE-1994


Mathematics
  • Limit
  • Mean value theorem
  • Linear differential equation
  • Rank of matrices
Design
  • Euler’s critical buckling load
  • Tensile forces
  • Period of oscillation
  • Power transmitted by shafts
  • Condition for self locking in screw jacks
  • Hook’s law, kepler’s law,
  • Tresca criteria
Machine Tools
  • EDM (Electro Discharge machining)
  • ECM (Electro Chemical Machining)
Joining
  • Coating to arc welding electrodes
  • Natural flame in gas welding
  • Oxygen to acetylene ratio
Metal working
  • Hot and cold working process
  • Deep drawing of sheets
  • Drop forging
  • Extrusion
Casting
  • Investments die casting
  • Centrifugal casting
  • Shell moulding
Power Plant
  • Condenser
  • Rankine cycle
Fluid machines
  • Impulse turbine
  • Specific speed of pumps
Fluid Mechanics
  • Steam lines, path lines, steak lines
  • Equipotential lines
  • Prandlt’s mixing length
  • Velocity potential           
  • Meta centre
  • Circulation
  • Froude number, Reynolds number
  • Ratio of maximum velocity to average velocity for pipe flow
  • Head loss in pipe due to friction
  • Bernoulli’s equation and continuity equation
  • Venturimeter
  • Laminar to turbulent transition
  • Separation of boundary layer
  • Hydrodynamic boundary layer

Heat and mass transfer
  • Thermal conductivity
  • Shape factor, view factor
Refrigeration
  • Coefficient of performance
Strength of material
  • Ratio of maximum shear stress to average shear stress in rectangular section
Thermodynamics
  • Definition of Kelvin
  • Gas turbine cycle
  • Stirling cycle
  • Atkinson cycle
  • Ericson cycle
  • Brayton cycle
  • Isothermal compressibility, isentropic compressibility
  • Joule Thompson coefficient
  • Isobaric thermal expansion coefficient  
Engineering Mechanics
  • Tension in rotating mass
  • Motion of projectile
  • Force of friction
  • Collision’s of elastic bodies