a) The company has two diesel-powered standby generators, both of which are capable of supplying sufficient electrical power in the event of a failure. Both diesel engines have the same details on their name plates (given below), but one operates on the four- stroke cycle, whilst the other operates on a two-stroke cycle. As all the other information has been lost, you have been asked to determine the brake power, indicated power, and thus confirm the mechanical efficiency of each engine. Explain why these efficiency values may be different for each engine. Mean effective pressure 550 KN/m² Swept volume of 14 litres cylinder Speed of engine 150 revs/min 2000 Nm Brake torque Number of cylinders 8

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Engineering Drawing

Technical drawing has been around since ancient times. As in the ancient Renaissance, complicated drawings were created, including Leonardo da Vinci's drawing. Modern engineering drawing, including its specific orthographic projection with scale conventions, began in Europe (France) during the early stages of Industrialization. L.T. C. Rolt also made some of Marc's drawings for its block-making machinery (in 1799) that also may have contributed significantly to British engineering technology. Since he learned the art of presenting three-dimensional(3D) items in a two-dimensional(2D) plane, as we now term mechanical drawing.