Questions 21 to 23 are based on the following physical situation A conveyor belt collects sand and transports it to a height h as shown in the figure. The sand falls on the belt with negligible speed at constant rate u (mass per unit time). Friction between the belt and the sand particle is so high that the sand particles stop sliding almost instant- aneously after they hit the belt. Acceleration due to gravity is g. 21. What should speed of the belt be for the least possible driving force on the belt applied by the motor? (a) J0.5gh (c) /2gh (b) Jgh (d) A speed however small is possible. 22. What is the power delivered by the motor to the belt, when the motor is applying least possible driving force? (a) 0.5µgh (b) µgh (d) 2µgh (c) 1.5µgh 23. What is the power dissipated by the sand-belt system, when the motor is applying least poOssible driving force? (a) Zero (b) 0.25µgh (d) µgh (c) 0.5µgh

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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.