Last Updated 27 Jan 2021

# Decision Analysis Study Guide Scheduling

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Their processing times and due dates are given below. Using the critical ratio dispatching rule, in which order should the jobs be processed? 21. 22. 23. Job A B C D E a. b. c. d. 24. Processing Time (days) 4 2 8 3 5 B, D, A, E, C C, D, A, B, E C, E, A, D, B E, B, A, D, C Job due date (days) 7 4 11 5 11 Which of the following dispatching rules allows easy updates? a. FCFS: first come, first served b. SPT: shortest processing time c. EDD: earliest due date d. CR: critical ratio The priority rule which processes jobs according to the smallest ratio of due date to processing time is: a. ritical ratio b. earliest due date c. first come, first serve d. longest processing time Which of the following is an advantage of the FCFS dispatching rule when used in services? a. FCFS seems fair to customers b. FCFS minimizes the average number of jobs in the system c. FCFS minimizes the average lateness of all jobs d. FCFS maximizes the number of jobs completed on time The most appropriate sequencing rule to use if the goal is to dynamically track the progress of jobs and establish relative priority on a common basis is a. shortest processing time b. earliest due date c. critical ratio d.

Johnson's rule Use of the sequencing rule Shortest Processing Time generally results in a. minimum average lateness b. maximum utilization c. maximum effectiveness d. minimum average flow time When a set of jobs must pass through two workstations whose sequence is fixed, ______ is the rule most commonly applied. a. Johnson's Rule b. earliest due date rule c. first come, first serve rule d. slack time remaining A recent advance in short-term scheduling that makes use of expert systems and simulation in solving dynamic scheduling problems is a. forward scheduling b. backward scheduling c. infinite scheduling 5. 26. 27. 28. 29. 30. d. finite scheduling 31. Which of the following techniques does not contribute to increasing throughput at a bottleneck? a. schedule throughput to match capacity of the bottleneck b. increase capacity of constraint c. have cross-trained employees available to operate the constraint d. develop alternate routings An appliance manufacturer assembles icemakers in large batches. The operations manager would like to significantly reduce the batch size. What would you suggest? a. use the SPT rule b. use forward scheduling c. use finite scheduling d. develop level material use schedules 33.

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A firm wants to develop a level material use schedule based on the following data. What should be the setup cost? desired lot size: 60 annual demand: 40,000 holding cost: \$20 per unit per year daily production rate: 320 # of work days per year: 250 a. b. c. d. 34. \$0. 45 \$4. 50 \$45 \$450 32. Factory X is trying to use level use scheduling. If their first target were to cut the current lot size in half, by what proportion must setup cost change? a. Setup cost must be cut to one-fourth its current value. b. Setup cost must also be cut in half from its current value. c. Setup cost must double from its current value. . Cannot be determined. Which of the following is true regarding services scheduling? a. The Critical Ratio sequencing rule is widely used for fairness to customers. b. The emphasis is on staffing levels, not materials. c. Reservation systems are often used a means of manipulating the supply of services. d. Labor use can be intensive, and labor demand is usually stable. c d c a c d c d b c b d 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. a a c d a d a d a a b 35. Chapter 15: Multiple Choice Answers 13. 1. b 14. 2. d 15. 3. d 16. 4. a 17. 5. d 18. 6. a 19. 7. a 20. 8. d 21. 9. d 22. 10. c 23. 11. c 24. 12. a

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