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6. Which of the following is not one of the four main types of inventory? a, raw material inventory b. work-in-process inventory c. maintenance/repair/operating supply inventory d. safety stock inventory 7. Gibson Valves produces cast bronze valves on an assembly line. If 1600 valves are produced in an 8-hour shift, the productivity of the line is a. 2 valves/hour b. 40 valves/ hour C. 80 valves/hour d. 200 valves/hour 8. Which of these aggregate planning strategies adjusts capacity to match demand? a. back ordering b. using part-time workers C. counterseasonal product mixing d. changing price 9. Five jobs are waiting for processing through two work centers. Their processing time (in minutes) at each work center is contained in the table below. Each job requires work center Sigma before work center Delta. According to Johnson's rule, what sequence of jobs will minimize the completion time for all jobs? Jot Sigma Delta R 40 S 25 T 50 U 35 v 55 10 30 20 35 15 a. R-S-T-U-V b. S-V-T-R-U C. S-U-T-V-R d. V-R-U-S-T 10. A product's life cycle is divided into four stages, which are a introduction, growth, saturation, and maturity b. introduction, growth, stability, and decline C. introduction, maturity, saturation, and decline d. introduction, growth, maturity, and decline