Critical ratio priority sequence rule

Question

Question 1: Average job completion time is:

a. total processing time divided by the number of jobs.
b. total flow time divided by the number of jobs
c. total flow time divided by total processing time.
d. total flow time minus total late time.

Question 2: Work center loading:

a. is done prior to detailed scheduling.
b. does not incorporate a priority sequence rule.
c. is the assignment and commitment of specific jobs to each work center for the planning period.
d. all of the above.

Question 3: When using the critical ratio (CR) priority sequence rule:

a. a ratio of less than "1.0" implies that a job has a priority over a job with a ratio of more than "1.0".
b. a ratio of more than "1.0" implies that a job has priority over a job with a ratio of less than "1.0".
c. the job with the earliest 'due date' is scheduled first.
d. none of the above.

Question 4: Which of the following is not a performance measure used in scheduling?

a. job flow time.
b. tardiness.
c. labor capacity requirements.
d. utilization.

Question 5: Gantt charts have several major limitations to include:

a. the need to be updated regularly to account for new job arrivals and revised time estimates.
b. the inability to assess the relative work loads at each work center.
c. the inability to serve as a foundation for the detailed scheduling function.
d. the inability to signal the need for reallocation of labor and equipment to busier work centers.

Question 6: Assume a task has the following times: a = 10, m = 25, and b = 40. Its expected time is:

a. 10
b. 25
c. 40
d. 30
e. none of the above.

Question 7. The critical path of a network is the:

a. shortest time path through the network.
b. path with the fewest activities.
c. path with the most activities.
d. longest time path through the network.
e. none of the above.

Question 8. Given the following activity's optimistic, most likely, and pessimistic time estimates of 2, 10, and 20 days respectively, compute the PERT variance for this activity:

a. 3
b. 6
c.  9
d. 18
e. none of the above.

Question 9. Managers use the network analysis of PERT and CPM to help them:

a. derive flexibility by identifying noncritical activities.
b. replan, reschedule, and reallocate resources such as manpower and finances.
c. plan, schedule, monitor, and control large and complex projects.
d. all of the above.

Question 10. In an activity-on-node (AON) network, the nodes represent______whereas the arcs represent ______.

a. activities; time
b. activities; precedence relationships
c. events; activities
d. precedence relationships; time

True or False: (Select the one correct response )

Question 11. A job shop is a firm that specializes in medium- to large-volume production and utilizes line or continuous processes.

Question 12. The gantt chart ( for loading ) shows the order in which each job will be processed at each work center.

Question 13. Earliest due date ( EDD ) is a priority sequencing rule that states the job requiring the shortest processing time is the next job to be processed.

Question 14. Dispatching is the assignment and commitment of incoming jobs to one or more specific work centers, for the day or week.

Question 15. The DDATE priority sequence rule will always minimize average job lateness.

Question 16. The gantt chart ( for loading ) provides the basis for the promised date of the job to the customer.

Question 17. The assignment algorithm is an alternative method for performing the loading function in a job shop.

Question 18. The gantt chart ( for supplementary scheduling ) allows management to monitor the progress of all jobs in the system in real time.

Question 19. Activities on the critical path exhibit positive slack times.

Question 20. The variance of project completion time equals the variances of all activities in the project.

Question 21. The expected activity time is the average of an activity's optimistic and pessimistic times.

Question 22. Dummy activities are found in activity-on-arc (AOA) convention PERT/CPM network models.

Question 23. The dummy activity has an expected time of zero by definition.

Question 24: Early start time ( ES ) is computed from right to left (backward pass).

Question 25. The project-group approach extends little or no formal authority to the project coordinator.

Question 26. In problem one, the static slack for job 'E' is:

a. 3
b. 4
c. 5
d. 6
e. none of the above.

Question 27. In problem one, the static slack for job 'F' is:

a. 16
b. 15
c. 14
d. 13
e. none of the above.

Question 28. In problem one, the lateness for job 'C' is:

a. 0 days
b. 1 day
c. 2 days
d. 5 days
e. none of the above.

Question 29. In problem one, the average job completion time is:

a. ≈ 12 days
b. ≈ 13 days
c. ≈ 14 days
d. ≈ 15 days
e. none of the above.

Question 30. In problem one, the average job lateness is:

a. 2.666 days
b. 3.666 days
c. 4.666 days
d. 5.666 days
e. none of the above.

Question 31. In problem one, the number of late jobs will be:

a. 2
b. 3
c. 4
d. 5
e. none of the above.

Question 32. In problem two, the critical path is:

a. 13 weeks
b. 16 weeks
c. 19 weeks
d. 22 weeks
e. none of the above.

Question 33. In problem two, the early finish ( EF ) time for activity 'H' is:

a. 7th week
b. 8th week
c. 9th week
d. 10th week
e. none of the above.

Question 34. In problem two, the early start ( ES ) time for activity 'F' is:

a. 5th week
b. 6th week
c. 7th week
d. 8th week
e. none of the above.

Question 35. In problem two, the late start ( LS ) time for activity 'H' is:

a. 16th week
b. 17th week
c. 18th week
d. 19th week
e. none of the above.

Question 36. In problem two, the late finish ( LF ) time for activity 'F' is:

a. 16th week
b. 17th week
c. 18th week
d. 19th week
e. none of the above.

Question 37. In problem two, the slack time ( S ) for activity 'D' is:

a. 0 weeks
b. 1 week
c. 2 weeks
d. 3 weeks
e. 4 weeks

Question 38. In problem three, car '3' will be assigned to:

a. Bob
b. Fred
c. Mike
d. Tim

Question 39. In problem three, car '1' will be assigned to:

a. Bob
b. Fred
c. Mike
d. Tim

Question 40. In problem three, the total number of labor hours required will be:

a. 30 hours
b. 35 hours
c. 40 hours
d. 45 hours
e. none of the above.