CPIM Detailed Scheduling 2 — Questions and Answers
Question 1: In detailed scheduling, what does 'forward scheduling' mean?
- Scheduling backwards from the due date
- Scheduling forward from today to find the earliest completion date (Correct answer)
- Scheduling based on customer priority
- Scheduling based on resource capacity only
Correct answer: Scheduling forward from today to find the earliest completion date
Forward scheduling starts from the current date and schedules operations forward to determine the earliest possible completion date.
Question 2: Which dispatching rule gives priority to the job with the smallest ratio of remaining processing time to remaining slack time?
- Critical Ratio (CR)
- Shortest Processing Time (SPT)
- Least Slack per Operation (S/OPN) (Correct answer)
- First Come First Served (FCFS)
Correct answer: Least Slack per Operation (S/OPN)
The Least Slack per Operation rule divides remaining slack by the number of remaining operations to prioritize jobs closest to being late.
Question 3: A work center has a demonstrated capacity of 400 standard hours per week. If efficiency is 90% and utilization is 80%, what is the rated capacity?
- 288 standard hours (Correct answer)
- 320 standard hours
- 360 standard hours
- 400 standard hours
Correct answer: 288 standard hours
Rated capacity = demonstrated capacity × efficiency × utilization = 400 × 0.90 × 0.80 = 288 standard hours.
Question 4: What is the primary purpose of a dispatch list in a manufacturing environment?
- To track finished goods inventory
- To authorize and prioritize work orders at a work center (Correct answer)
- To schedule preventive maintenance
- To document quality inspection results
Correct answer: To authorize and prioritize work orders at a work center
A dispatch list is a prioritized sequence of work orders released to a work center, telling operators what to work on and in what order.
Question 5: In finite capacity scheduling, what happens when a work center is overloaded?
- Jobs are automatically cancelled
- Jobs are rescheduled to alternate periods or resources (Correct answer)
- The system ignores the overload condition
- All jobs receive equal priority
Correct answer: Jobs are rescheduled to alternate periods or resources
Finite scheduling recognizes capacity limits and resolves overloads by moving jobs to different time periods or alternate resources.
Question 6: Which of the following best describes 'queue time' in a manufacturing routing?
- The time a job spends being actively processed
- The time a job waits before being processed at a work center (Correct answer)
- The time required to move a job between work centers
- The time required to set up a machine
Correct answer: The time a job waits before being processed at a work center
Queue time is the waiting time a job experiences before actual processing begins at a work center, often the largest component of lead time.
Question 7: When using the Critical Ratio (CR) dispatching rule, a CR value less than 1.0 indicates:
- The job is ahead of schedule
- The job is on schedule
- The job is behind schedule and at risk of being late (Correct answer)
- The job has been completed
Correct answer: The job is behind schedule and at risk of being late
A CR below 1.0 means the time remaining is less than the work remaining, signaling the job is behind schedule and needs priority.
CPIM Detailed Scheduling 2
In detailed scheduling, what does 'forward scheduling' mean?