Category Archives: Mechanical

News and related subject info about Mechanical engineering..

GATE 2014 Aerospace Engineering Syllabus – Flight Mechanics

Flight Mechanics

Atmosphere

  • Properties,
  • Standard atmosphere,
  • Classification of aircraft,
  • Airplane configurations and various parts

Airplane Performance

  • Pressure Altitude;
  • Equivalent, calibrated, indicated air speeds;
  • Primary flight instruments: Altimeter, ASI, VSI, Turn-bank indicator,
  • Drag polar;
  • Takeoff and landing;
  • Steady climb & descent;
  • Absolute and service ceiling;
  • Cruise, climb, endurance or loiter;
  • Load factor,
  • Turning flight,
  • V-n diagram;
  • Winds: head, tail & cross winds.

Static Stability

  • Angle of attack,
  • Sideslip;
  • Roll, pitch &yaw control;
  • Longitudinal stick fixed & free stability,
  • Horizontal tail position and size;
  • Directional stability,
  • Vertical tail position and size;
  • Dihedral stability.
  • Wing dihedral, sweep position; hinge movements, stick forces.

Dynamic Stability

  • Euler angles;
  • Equations of motion;
  • Aerodynamic forces and moments,
  • Stability & control derivatives;
  • Decoupling of longitudinal and lateral directional dynamics;
  • Longitudinal and lateral directional modes.

GATE 2014 Aerospace Engineering Syllabus – Mathematics

Engineering Mathematics

Linear Algebra

  • Matrix algebra,
  • Systems of linear equation,
  • eigen values and eigen vectors.

Calculus

  • Functions of single variable, limit, continuity and differentiability,
  • Mean value theorems,
  • Evaluation of definite and improper integral,
  • Partial derivatives,
  • Total derivatives,
  • Maxima and minima,
  • Gradient, divergence and curl,
  • Vector identities,
  • Directional derivatives, line, surface and volume integrals,
  • Theorems of Stokes, Gauss and Green.

Differential calculus

  • Frist order linear and nonlinear equations,
  • Higher order linear ODEs with constant coefficients,
  • Cauchy and Euler equations,
  • Initial and boundary value problems,
  • Laplace transforms.
  • Partial differential equations and separation of variables methods.

Numerical Methods

  • Numerical solution of linear and nonlinear algebraic equations,
  • Integration by trapezoidal and Simpson rule,
  • Single and Multi-step methods for differential equations.

Parts of Engine

Spark plug
The spark plug supplies the spark that ignites the air/fuel mixture so that combustion can occur. The spark must happen at just the right
moment for things to work properly.

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Valves
The intake and exhaust valves open at the proper time to let in air and fuel and to let out exhaust. Note that both valves are closed during compression and combustion so that the combustion chamber is sealed.

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Piston
A piston is a cylindrical piece of metal that moves up and down inside the cylinder.

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Piston rings
Piston rings provide a sliding seal between the outer edge of the piston and the inner edge of
the cylinder. The rings serve two purposes:
1. They prevent the fuel/air mixture and exhaust in the combustion chamber from leaking into the sump during compression and combustion.
2.They keep oil in the sump from leaking into the combustion area, where it would be burned and lost.

Most cars that “burn oil” and have to have a quart added every 1,000 miles are burning it because the engine is old and the rings no
longer seal things properly.

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Connecting rod
The connecting rod connects the piston to the crankshaft. It can rotate at both ends so that its
angle can change as the piston moves and the crankshaft rotates.

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Crankshaft
The crankshaft turns the piston’s up and down motion into circular motion just like a crank on a jack-in-the-box does.

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Sump
The sump surrounds the crankshaft. It contains some amount of oil, which collects in thebottom of the sump

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