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  CENTRE OF GRAVITY The point at which the whole mass or weight of Body is supposed to act, irrespective of the position of the Body is known as centre of gravity . It is generally written as C.G. and denoted by letter ‘G’. The term centre of gravity is applied to the solid body having Volume . {e.g. Cone, Cylinder, Sphere, Hemisphere etc.) Cone Cylinder Sphere Hemisphere   CENTROID The point at which the entire area of a plane lamina or plane figure is supposed to be acting, irrespective of the position of lamina is known as centroid or centre of area of body . It is generally denoted by letter ‘C’ or ‘G’. The term centroid is applied to the plane figures having Area . {e.g. plane figures like triangle, rectangle, square, circle. Semicircle, trapezium, quadrilateral, etc.) Circle Triangle Rectangle Trapezium ...

Simple Vapour Compression Cycle   Fig.- Simple Vapour Compression Cycle A fundamental refrigeration cycle used in air conditioning and refrigeration systems is the Simple Vapour Compression Cycle (VCC). Compressor, condenser, expansion valve, and evaporator make up its four primary parts.   1.      Compressor: The compressor is used to raise the temperature and pressure of low-pressure refrigerant vapour that is drawn in from the evaporator. The refrigerant's energy level is increased by this compression. 2.      Condenser: The compressor sends high-pressure, high-temperature refrigerant vapour into the condenser. Here, heat exchange between the refrigerant and the environment (air or water) results in the release of heat. The outcome is that the refrigerant condenses into a liquid under high pressure. 3.      Expansion Valve: The liquid refrigerant is then forced through a throttle valve or expansion...