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MECHANICAL ENGINEERING : Evergreen Branch in Engineering and Technology

Mechanical engineers are employed in various fields such as Automotive, Aerospace, Computer, Chemical, Electrical, Electronic , Industrial, Manufacturing, Mining, Petroleum, Railway, Pharmaceutical, Printing, Textile, Biomedical, Environmental, Nano, Fluid and Solid Mechanics , Thermal Science, Maintenance , Sales and Administration fields. Mechanical engineering is the strong base for engineering and occupies one of the best employment opportunities in industries.

Types of Gear Trains

In gear train, combination of two or gears are used to transmit power. The gear train is classified into following types, Simple gear train Compound gear train Riveted gear train Epicyclic gear train 1.Simple gear train In this type, there is only one gear is mounted on each shaft. 2.Compound gear train In this type, two or more gears are mounted on each shaft. 3.Riveted gear train The compound gear

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Gears and Gear Train

Gear is a toothed wheel to transmit power from one shaft to another shaft with exact velocity ratio without slip, power loss. Gear Train: if the the two or more number of gears are used to transmit the power, then the arrangement is called as gear train. Types of Gears: 1.Parallel shaft gears In this type, the axis of mesing gears are parallel. Spur gear: Teeth are parallel to the

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Classification of Gears

Gears are broadly classified into three types, Parallel shaft gears Intersecting shaft gears Non parallel non intersecting shaft gears 1.Parallel shaft gears Spur gear Helical gear Rack and pinion 2.Intersecting shaft gears Bevel gear-Straight bevel, Spiral bevel, Hypoid bevel 3.Non parallel non intersecting shaft gears Spiral gear Worm gear  

Heat and Temperature

What is Heat? Heat is the energy transfer without transfer of mass across the boundary of the system because of the temperature difference between the system and surrounding. The heat is transferred across the boundary from system at high temperature to a system at lower temperature. The heat given to a system is taken as positive and heat getting from the system is taken as negative. The heat transfer can

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Laws of Thermodynamics

There are four laws of thermodynamics, they are Zeroth law of thermodynamics First law of thermodynamics Second law of thermodynamics Third law of thermodynamics Zeroth law of thermodynamics: This law states “Consider three bodies namely A, B, C, if A and B are individually in thermal equilibrium with a third body C then, the bodies A and B also will be in thermal equilibrium with each other. If two bodies

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Inertia and types of Inertia

Inertia and types of Inertia What is Inertia : The resistance to change of state of an object due to its own mass is usually known as inertia. The amount of resistance given by an object to change its state is directly proportional to its own mass. Types of Inertia: Mass moment of inertia Area moment of inertia Polar moment of inertia Mass moment of inertia: The resistance of an

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Difference between turbocharging and supercharging

Supercharging and turbocharging are similar in process and differ in operation, it means, both are used for same purpose i.e to increase engine power, efficiency, torque by compressing the air in multistage for increasing quantity of air, pressure and temperature. But the difference is , In turbocharging, the exhaust gases from the engine cylinder is used to drive the turbine. The turbine and compressor are mounted on the same shaft.

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Supercharging and its advantages

To increase the engine’s efficiency, torque and power, the rotation of crank shaft is used to drive the turbine through gears and chains or pulleys and belts. The turbine and compressor are mounted on the same shaft. When the crank shaft rotates, the shaft of the turbine also rotates since both are connected mechanically through gear and chain or pulley and belt arrangements. Hence the turbine produces mechanical energy i.e

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Turbocharging and its advantages

To increase the engine’s efficiency, torque and power, the exhaust gases from the engine cylinder is used to drive the turbine. The turbine and compressor are mounted on the same shaft. When the exhaust gases are passed through turbine, the turbine rotates as the gases import heat energy, hence the turbine produces mechanical energy i.e rotation of shaft for driving compressor. Now the compressor also rotates to compress the inlet

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How velocity boundary layer forms? Velocity Boundary Layer Thickness

Velocity Boundary Layer or Velocity Boundary Layer Thickness: The boundary layer is formed when the fluid is viscous, viscous fluid means it has the resistance to flow i.e viscosity. When the viscous fluid flows over the surface, the layer of fluid closer to the surface sticks to the  surface, sticks means it sticks partially to the solid surface and flows, hence the layer of fluid sticks to the surface experiences

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How thermal boundary layer forms? Thermal Boundary Layer Thickness

Thermal Boundary Layer or Thermal Boundary Layer Thickness: As the resistance exist between the layers and surface for a viscous flow, there will be a friction, hence heat is generated. Now when the fluid flows over the surface, it receives the heat from the surface if it is cooler than surface and it losses the heat to the surface if it is hotter than surface. We know that, when the

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What is Boundary Layer or Boundary Layer thickness?

Many peoples are confusing with this term” Boundary Layer”, since most of the text books definitions are like this, The boundary layer is defined as ” the layer in which -local velocity reaches 99% of free stream velocity for velocity boundary layer or the local temperature reaches 99% of free stream temperature for thermal boundary layer. Let us explain boundary layer completely here. Before explanation, if the boundary layer is

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What is Scavenging?

What is Scavenging? Scavenging is the process used in IC engines in which the burnt gases are forced or pushed to atmosphere from the engine cylinder by using the inlet pressure of fresh air. Importance and Causes of Scavenging: If the burnt gases inside the engine cylinder are not completely exhausted, then the following incidents will happen: Already burnt gases will be compressed again during the compression stroke if they

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Major M.Tech Programmes/Courses in Mechanical Engineering

Thermal Engineering Design Engineering Manufacturing Engineering Computer Integrated Manufacturing Industrial Engineering Automotive Engineering CAD / CAM Mechatronics Internal Combustion Engineering Refrigeration and Air Conditioning Product Design and Development Energy Engineering  

Why diesel cannot be used in petrol engine?

We know that, petrol is ignited by spark and diesel is ignited by compression ignition, the volatility of the petrol is greater than diesel. The spark plug produces the spark only at some places, not at all the point of air-fuel mixture. If the air-fuel mixture from the carburetor is completely vapourised the fire produced by the spark can penetrate throughout the mixture to burn all the mixture. Hence to

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Why petrol cannot be used in diesel engine?

The fire point of the diesel is greater than petrol and compression ratio of diesel engine is greater than petrol engine. If we use petrol on the diesel engine, since diesel engine has greater compression ratio the air heated during the compression has temperature which is enough to burn the diesel, but here we use petrol, the petrol injected at the end of compression would burn immediately before the power

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Why Mechanical Engineering

Mechanical engineers can work and employed in various fields such as Automotive, Aerospace, Computer, Chemical, Electrical, Electronic , Industrial, Manufacturing, Mining, Petroleum, Railway, Pharmaceutical, Printing, Textile, Biomedical, Environmental, Nano, Fluid and Solid Mechanics , Thermal Science, Maintenance , Sales and Administration fields. Mechanical engineering is the strong base for engineering and occupies one of the best employment opportunities in industries.