Mechanical Engineering

A plane angle is one that can be measured completely within a plane. This may be because the angle occurs in a 2-D space, or it is an angle that is contained completely within a plane that is in a 3-D (or higher-D) space. So the angles in a triangle are plane angles, because they are in a plane. Similarly, the angles in a spherical triangle are plane angles, because even though they measure things in a 3-D space, they can always be shown to be wholly within a plane. Another way to consider a plane angle is to think of angles within a circle. You can divide the circle up into 2π radians, for example, or 360°, or 400 gon, or whatever units you choose. However, the radian as a unit is defined by the subtended arc length that is equal to the radius of the circle. A steradian, the basic unit, is solid angle is one that is subtended by a portion of the surface area of a sphere that is equal to r^2, where r is the radius of the sphere. It can be considered to be a cone subtended at...

These process are very simple.  All three devices work on the basis of heat flow. In a heat engine, heat is transferred from a higher temperature level called source to a lower temperature level called sink. Work is obtained during this process. A refrigerator is a reversed heat engine. Heat is transferred from the lower temperature level to higher temperature by applying external work to maintain the temperature below atmospheric temperature. A heat pump is similar to a refrigerator. The only point of difference between the two is of the operating temperatures. The working temperatures in a refrigerator are of the colder level and atmosphere, whereas working temperatures in heat pump are of hotter level and atmosphere.

Many industries employ mechanical engineers; a few industries and the type of systems MEs design are listed below.  Automotive    • Combustion    • Engines, transmissions    • Suspensions  Aerospace (w/ aerospace engineers)    • Control systems    • Heat transfer in turbines    • Fluid mechanics (internal & external)  Biomedical (w/ physicians)   • Bio-mechanics – prosthesis   • Flow and transport in vivo  Computers (w/ computer engineers)   • Heat transfer   • Packaging of components & systems  Construction (w/ civil engineers)   • Heating, ventilation, air conditioning (HVAC)   • Stress analysis  Electrical power generation (w/ electrical engineers)   • Steam power cycles - heat and work   • Mechanical design of turbines, generators Petrochemicals (w/ chemical, petroleum engineers)   • Oil drilling - stress, fluid flo...