Question B-8 8. You are part of a group of Second Year Engineering Students at University of Botswana, intending to establish a Small Scale Recycling Plant for plastic materials in Gaborone. (a) Which recycling process options would you consider? (4 marks) (b) Briefly explain which option you would adopt, giving reasons for your choice. (6 marks) Question B-9 9. (a) Name two types of moulds commonly used in Compression Moulding of polymer materials. (2 marks) (b) Explain the main differences between the two types of moulds. (4 marks) (c) What are the advantages and disadvantages associated with each type of mould? (4 marks) Question B-10 10. (a) With the aid of diagrams briefly describe the 'Blow Moulding Process (6 marks) (b) Give two examples of polymer materials that can be processed by Blow Moulding. (2 marks) (c) Give two examples of products that can be produced by Blow Moulding. (2 marks)

Q1) Read the following sentences, write true or false, and correct the sentences that are false: 70, and by 20% 111 I Ultian vanas Ol Yu 3- The alkali silica reaction is very fast, happen between active silica in the cement and the alkalis in aggregate. Call wings: [5M] 4- Sulphate in mixing water should not be more than 10,000 ppm. 5- Higher curing temperature decrease earlier strength, but it increases 28-day strength of concrete.