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Terms in this set (61)
1. "Flow-shop scheduling" is used in high volume systems.
2. Line balancing is a major factor in the design and scheduling of low volume systems because of batch processing.
3. Scheduling in intermediate-volume systems has three basic issues: run size, timing, and sequence.
4. When operations are often bottlenecked, additional planned idle time will improve the throughput in those areas.
5. When orders exceed our capacity, priority rules are used to select which orders will be accepted.
6. The term loading, as used in scheduling, refers to choosing the order in which jobs will be processed in low-volume systems.
7. Loading is the determination of which work centers should perform which jobs.
8. A Gantt chart is a basic scheduling tool but works best for high-volume systems.
9. A Gantt chart is a basic scheduling tool that is most useful in low-volume systems.
10. A schedule chart depicts the loading and idle times for a group of machines or departments.
11. The output of the system cannot exceed the output of the bottleneck operation(s).
12. The elimination of idle time on both bottleneck and non-bottleneck operations must be accomplished to optimize output.
13. As long as the bottleneck operations are used effectively idle time in non-bottleneck operations will not affect the overall productivity of the system.
14. The quantity sent to a bottleneck operation could be split into two or more process batches to better utilize a bottleneck resource rather than process the entire batch.
15. Splitting a large lot after one operation beyond a bottleneck operation would reduce the overall waiting time of the bottleneck operation.
16. Input/output (I/O) control refers to monitoring the productivity changes since productivity is determined by the ratio of Output to Input.
17. Infinite loading and finite loading are two major approaches used to load work centers.
18. A schedule chart can be used to monitor job progress.
19. The assignment model seeks an optimum matching of tasks and resources.
20. Sequencing is concerned with the order in which jobs are done, while loading is concerned with assigning jobs to work centers or workstations.
21. Priority rules are widely used to sequence jobs in high-volume systems.
22. The assignment method is limited to a maximum of two jobs per resource.
23. Priority rules generally assume that job setup cost is independent of processing sequence of jobs.
24. In a single work center, makespan improvement can be accomplished by selecting the optimal sequencing rule.
25. Priority rules are used in low-volume systems to identify an optimal processing sequence.
26. The SPT priority rule always results in the lowest average completion time.
27. Bottlenecks may shift with the passage of time, so that different operations become bottleneck operations at different times.
28. If optimal sequencing through three work centers is desired, Johnson's Rule II is used rather than Johnson's Rule.
29. In the decision-making hierarchy, scheduling decisions are the final step in the transformation process before actual output occurs.
30. Makespan is the total time needed to complete a group of jobs.
31. The theory of constraints has a goal of maximizing flow through the entire system.
32. A major disadvantage of the SPT rule is that it tends to make very short jobs wait for a long time while longer, more important jobs are processed.
33. The SPT rule minimizes idle time for subsequent operations.
34. Johnson's rule is a technique used to sequence jobs through a two-step work sequence.
35. A basic difference between scheduling in service systems and scheduling in manufacturing systems is the random nature of requests in manufacturing systems as opposed to more uniform requests in service systems.
36. Batch process helps maximize worker efficiency.
37. Because scheduling is a matter of detailed execution, it has little impact on the operations strategy of an organization.
38. Scheduling pertains to:
A. hiring workers
B. process selection
C. buying machinery
D. timing the use of specific resources
E. determining the lowest cost
39. Which of the following is the last step in the capacity/scheduling chain?
A. product planning
B. process planning
C. capacity planning
D. aggregate planning
40. Which of the following is not an example of a high-volume system?
A. aircraft manufacturing
B. magazine printing
C. petroleum refining
D. waste treatment
E. commercial donut baking
41. Which of the following is not usually a characteristic of successful high-volume systems?
A. smooth workflow through the system
B. customized output
C. rapid repair of breakdowns
D. minimal quality problems
E. reliable supply schedules
42. Primary considerations in scheduling high-volume systems involve: (I) coordinating the flow of inputs (II) overcoming the disruptions to planned outputs (III) assigning workers to work centers
A. I and III
B. I and II
C. II and III
D. I, II, and III
E. II only
43. Organizations with fixed, perishable capacity can benefit from _______.
A. Yield Management
B. Price increases
E. Waiting lines
44. A work center can be a ___________.
B. group of machines
E. all of the above
45. The EDD priority rule usually does well with regard to _______.
46. Which of the following is not an assumption of priority rules?
A. The set of jobs is known: no new jobs arrive after processing begins.
B. Setup time is independent of processing sequence.
C. Finite loading is assumed.
D. Processing times are deterministic.
E. No machine breakdowns are assumed.
47. The two different approaches to load work centers in job-shop scheduling are:
A. load charts and schedule charts
B. Gantt charts and assignment method
C. infinite loading and finite loading
D. linear programming and makespan
E. none of the above
48. The priority rule which will sequence jobs in the order they are received is _________.
49. A scheduling technique used to achieve an optimum, one-to-one matching of tasks and resources is:
A. the assignment method
B. Johnson's rule
C. the optimum production technology method (OPT)
D. the appointment method
E. the reservation method
54. Effective scheduling cannot:
A. yield cost savings and improved productivity
B. reduce the need for expansion of facilities
C. improve customer service
D. eliminate the need to train employees
E. improve patient care in medical settings
56. Scheduled due dates are the result of:
A. promises to customers
B. MRP processing
C. managerial decisions
D. all of the above
E. our competitor's promises
57. Which of the following is not a measure for judging the effectiveness of a schedule sequence?
A. average number of jobs at the work center
B. total number of jobs at the work center
C. average completion (flow) time
D. average job tardiness
E. none of the above
58. The purpose of cyclical scheduling is to:
A. eliminate weekends and holidays
B. rotate schedules
C. add flexible hours
D. incorporate overtime
E. observe work patterns
59. Average completion (flow) time for a schedule sequence at a work center is:
A. the sum of processing time divided by the number of jobs
B. the sum of jobs' flow times divided by the number of jobs
C. overall flow time divided by total processing time
D. total processing time plus total late time divided by number of jobs
E. the sum of flow time plus total late time divided by number of jobs
60. The scheduling sequencing rule which always results in the lowest average completion (flow) time is the:
A. first come, first served (FCFS) rule
B. shortest processing time first (SPT) rule
C. earliest due date first (EDD) rule
D. least slack per operation first (S/O) rule
E. run until slack happens (RUSH) rule
62. A scheduling rule used for sequencing jobs through two work centers is:
A. critical ratio rule
B. Johnson's rule
C. slack per operation rule
D. shortest processing time rule E. Pareto rule
65. A major difference between manufacturing and service systems in terms of scheduling is:
A. variability in arrival and service rates
B. processing cost per unit
C. the number of units to be processed
D. length of processing time E. output rate
66. Scheduling in service systems often takes the form of:
A. appointment systems
B. reservation systems
C. (A) and (B)
D. makespan systems
E. all of the above
67. Scheduling in service systems may involve scheduling:
A. the workforce.
B. the equipment.
C. (a) and (b).
E. all of the above.
68. One disadvantage of appointment systems is:
A. Capacity can be adjusted by varying hours.
B. The customer's desired time may be already taken.
C. People generally accept it as fair.
D. It can reduce customer waiting time.
E. Appointments do not have to be all the same length.
69. In an assignment model where there are fewer jobs than resources:
A. Dummy jobs are needed to solve the problem.
B. Dummy resources are needed to solve the problem.
C. The problem can't be solved using an assignment model.
D. The problem will have multiple optimum solutions.
E. The simplex method must be used to solve the problem.
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