A hvdraulic cylinder has a piston 100mm in diameter and a piston rod 70mm in diameter. The oil flow rate is25l-/min and the pressure is 20 x l05Pa. The backpressure of the return oil is
2 x105Pa. Trv to calculate the largest thrusts, the moving speeds and their directions at the situations of a, b , c ( see the f ig. A-8 ) .

A)-in the process of engineering design, explain the contribution of material selection. b)- explain the procedure of synthesis as is employed in engineering design. c)- is there any relationship between ergonomics and engineering design? explain. d)- safety consideration in engineering design includes human, product and the enviroment . explain how safety will be incorporated into the design?

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b.s. and b.s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.