For the process shown in the schematic below, which of the statements is/are incorrect? Feed hopper Feed hopper Mold cavity Mold Nozzle Spreader Heating chamber 3 Ram Hydraulic pressure Plastic pellets Which statement is incorrect regarding the mechanical characteristics of polymers? B Turning screw Barrel O a. Elongation at break is typically greater for polymers than metals O b. Metals typically have higher tensile strength but lower elastic modulus than polymers O C. The elastic modulus of semi-crystalline polymers rises as chain entanglement decreases Od. Decreasing the temperature results in increased brittleness in polymers O e. Amorphous and semi-crystalline polymers both become brittle at lower temperatures Of. Polymers are similar to metals i.e., they can also exhibit both ductile and brittle fracture Select one: O a. The region around B experiences mainly compressive strain Consider a defect in a crystalline lattice as shown below. Which of the following statements is true? Heaters Select one or more: O a. To release the part, the process typically involves the mould sections opening and the ejector pins pushing the object out of the mould O b. The process can only work with thermoplastics and not with thermosets due to the thermal processing requirements O c. The mould cavity region is usually temperature controlled so that at the point of injection it is heated and then gradually cooled down until the part is released Od. This process is best suited for the large volume production of tubes, bars and beams due to the nature of the extrusion process Oe. The feedstock has to be molten or liquid monomer, the temperature of which will constantly be held above the melting temperature O b. The region around B experiences mainly shear strain O c. The region around B is unaffected by the impurity O d. The region around B experiences a higher strain on the upper side compared to the lower side Shaping die Molten plastic Extrudate Tubing and pipes Sheet and film Structural parts

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Discuss the career options and job titles that are available to mechanical engineers. Describe some of the main subjects that comprise a typical mechanical engineering curriculum.

b) The elastic limit for some materials is difficult to determine exactly and so a yield point is defined as the point where a permanent deformation of 0.2% of the original length is obtained. Sketch a graph of stress against strain to illustrate this, marking appropriate points for the proportional limit, elastic limit and yield point.