Chapter 14 Operations Scheduling and Sequencing PDF

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Chapter 14 - Operations Scheduling and Sequencing 1. Different industries use different software packages for scheduling because every industry has different problem structures. a. True b. Fals e ANSWER: True 2. Customized scheduling spreadsheets use readily available software such as Microsoft Excel, but may be rather expensive to develop. a. True b. Fals e ANSWER: True 3. The Clarke-Wright Heuristic Method is used to solve the common scheduling problem in logistics that involves determining routes from a central depot or warehouse to many customers. a. True b. Fals e ANSWER: True 4. Two examples of process-focused performance measures for sequencing rules are tardiness and lateness. a. True b. Fals e ANSWER: False 5. In the context of operations management,__________refers to the assignment of start and completion times to particular jobs, people, or equipment. a. scheduling b. appointing c. statistical forecasting d. demand planning ANSWER: a 6. Gantt charts are used to: a. develop a factory layout. b. track inventory levels over time. c. monitor planned schedules. d. forecast personnel requirements. ANSWER: c 7. In the context of sequencing, the _____ minimizes the average lateness of a set of jobs. Copyright Cengage Learning. Powered by Cognero.

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Chapter 14 - Operations Scheduling and Sequencing a. shortest processing time rule b. earliest due date rule c. first come, first serve rule d. fewest number of operations remaining rule ANSWER: a 8. In the context of sequencing, the shortest processing time (SPT) rule tends to: a. maximize the number of jobs in the system. b. maximize average flow time. c. minimize resource utilization. d. minimize work-in-process inventory. ANSWER: d 9. In a two-resource sequencing problem, _____. a. the processing time for each job on each resource is unknown b. flow time is maximized c. the goal is to minimize makespan d. a job can be processed by either of its resources in any sequence ANSWER: c 10. Five jobs are ready for processing at time zero through a workstation. The details regarding the processing time and the due date of completion is provided in the following table. Job Processing Time (days) Due Date A 6 10 B 5 17 C 2 13 D 3 9 E 4 15 Using the earliest due date (EDD) rule, the average tardiness of the five jobs is: a. more than 0.1 but less than or equal to 0.3 day. b. more than 0.3 but less than or equal to 0.5 day. c. more than 0.5 but less than or equal to 0.7 day. d. more than 0.7 but less than or equal to 0.9 day. ANSWER: c 11. A requirement of two-resource sequencing rule is that: a. all jobs must begin at the same time. b. each job must be processed first on the first resource and then on the second. c. a maximum of two jobs can be processed at a time on each resource. d. total processing time must be minimized. ANSWER: b Copyright Cengage Learning. Powered by Cognero.

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Chapter 14 - Operations Scheduling and Sequencing 12. A movie theater requires the following minimum number of employees, each of whom is required to have two consecutive days off. Day: Mon. Tue. Wed. Thur. Fri. Sat. Sun. Minimum Number of 1 1 3 2 5 4 3 Employees Required Using the staff scheduling method, it is determined that the number of employees required as per the final employee schedule is _____. a. 3 b. 4 c. 5 d. 6 ANSWER: c 13. There are five jobs in a factory. All these jobs have to go through two workstations for processing. Each job is processed on Workstation #1 and then on Workstation #2. The processing time for each job on each workstation is given below. Job Time on Workstation #1(minutes) Time on Workstation #2(minutes) A 50 50 B 20 8 C 25 50 D 30 12 E 11 22 F 11 19 Using Johnson's sequencing rule, it can be concluded that the makespan of the sequence is: a. more than 50 but less than or equal to 100 minutes. b. more than 100 but less than or equal to 150 minutes. c. more than 150 but less than or equal to 200 minutes. d. more than 200 but less than or equal to 250 minutes. ANSWER: c 14. Five jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table. Job Processing Time (days) Due Date A 6 18 B 3 14 C 4 9 D 5 19 E 2 11 Using the earliest due date (EDD) rule, the average flow time for the five jobs is _____. a. more than 8 but less than or equal to 10 days. b. more than 10 but less than or equal to 12 days. Copyright Cengage Learning. Powered by Cognero.

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Chapter 14 - Operations Scheduling and Sequencing c. more than 12 but less than or equal to 14 days. d. more than 14 but less than or equal to 16 days. ANSWER: c 15. An electronic gadgets store requires the following minimum number of employees, each of whom is required to have two consecutive days off. Day: Mon. Tue. Wed. Thur. Fri. Sat. Sun. Minimum employees 9 2 8 6 9 1 3 required: If there are no day offs provided on Thursday and Friday, the number of employees required to work on Thursday as per the final employee schedule is _____. a. 9 b. 10 c. 11 d. 12 ANSWER: b 16. In the context of operations management, triage nurses deciding on the order in which emergency patients are to be treated is an example of _____. a. appointing b. sequencing c. statistical forecasting d. demand planning ANSWER: b 17. Five jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table. Job Processing Time (days) Due Date A 8 12 B 4 9 C 3 6 D 7 7 E 5 20 Using the shortest processing time (SPT) rule, it can be concluded that the average flow time for these five jobs is _____. a. more than 8 but less than or equal to 10 days. b. more than 10 but less than or equal to 12 days. c. more than 12 but less than or equal to 14 days. d. more than 14 but less than or equal to 16 days. ANSWER: c 18. In the context of sequencing, the earliest due date (EDD) rule: a. minimizes the maximum number of jobs past due. b. maximizes average flow time of jobs past due. Copyright Cengage Learning. Powered by Cognero.

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Chapter 14 - Operations Scheduling and Sequencing c. maximizes resource utilization of jobs past due. d. minimizes the average processing time of jobs past due. ANSWER: a 19. A new surgical facility called Cut & Sew has opened in the United States. The branches of the facility are spread throughout the country. These are job shops that handle a variety of outpatient surgical procedures. The process of the facility is set up in a way that one doctor will cut and another will sew. The data regarding the patients and the estimated time for cutting and sewing for each patient are given in the following table: Patient Cut Time (hours) Sew Time (hours) A 2.3 2.8 B 2.5 3.0 C 2.0 1.5 D 0.6 1.0 E 3.6 2.6 Using Johnson's sequencing rule, the final sequence of the patients is _____. a. A-B-C-D-E b. B-E-A-C-D c. C-A-B-E-D d. D-A-B-E-C ANSWER: d 20. In the context of sequencing,__________is the time needed to process a given set of jobs. a. flow time b. makespan c. lateness d. tardiness ANSWER: b 21. Five jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table. Job Processing Time (days) Due Date A 5 11 B 6 16 C 3 19 D 4 10 E 2 9 Using the earliest due date (EDD) rule, the average lateness for the five jobs is: a. more than -6 but less than or equal to -2 days. b. more than -2 but less than or equal to 2 days. c. more than 2 but less than or equal to 6 days. d. more than 4 but less than or equal to 8 days. ANSWER: b

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Chapter 14 - Operations Scheduling and Sequencing 22. In the context of sequencing,__________is the difference between the completion time and the due date of a job. a. flow time b. makespan c. lateness d. tardiness ANSWER: c 23. In the context of sequencing,__________is the amount of time by which the completion time exceeds the due date of a job. a. flow time b. makespan c. lateness d. tardiness ANSWER: d

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