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நன்றி.<more posts comming soon> 

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Jet engines :- Jet engines are  internal combustion engines  discharging hot exhaust gases at high velocity that generate thrust. Unlike the internal combustion engines in automobiles & trucks which convert the up & down movement of the piston to rotary movement of crankshaft, jet engines simply produces power by sucking air at the front side & discharging it at the back side. Types of jet engines/gas turbines :- Turbojet engines  :-   Animation of working of a jet engine. Also you could see that air is flowing faster while leaving the nozzle than while entering. These were the first jet engines. The fans in the front does the work of compressor. The compressed air is then forced into the combustion chamber. As the air is already at high pressure and high temperature, fuel is injected into it. Combustion takes place into the chamber & high amount of exhaust gases are produced. These hot expanding gases are then made to flow through turbine which causes the
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Types of patterns

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Types of patterns used in Casting Process Types of patterns: The following factors affect the choice of a pattern. (i)  Number of Castings to be produced. (ii)  Size and complexity of the shape and size of casting (iii)  Type of molding and castings method to be used. (iv)  Machining operation (v)  Characteristics of castings Different types of patterns: The common types of patterns are: 1)  Single piece pattern 2)  Split piece pattern 3)  Loose piece pattern 4)  Gated pattern 5)  Match pattern 6)  Sweep pattern 7)  Cope and drag pattern 8)  Skeleton pattern 9)  Shell pattern 10)  Follow board pattern Figure 1:  Single piece, Split, Match-plate, Cope and Drag Pattern Single piece pattern: This is the simplest type of pattern, exactly like the desired casting. For making a mould, the pattern is accommodated either in cope or drag. Used for producing a few large castings, for example, stuffing box of steam engine. Split pattern: These patterns are split along the part
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