BA341 exam 4 review
C
A network has been crashed to the point where all activities are critical. Additional crashing: A. can be done, but all critical tasks must be reduced in duration. B. is prohibitively expensive. C. may require crashing multiple tasks simultaneously. D. is impossible. E. is unnecessary.
D
Activity D on a CPM network has predecessors B and C, and has successor F. D has duration 6. B's earliest finish is 18, while C's is 20. F's late start is 26. Which of the following is definitely true? A. B is a critical activity. B. C is completed before B. C. D has no slack but is not critical. D. D is critical, and has zero slack. E. F is critical, and has zero slack.
B
If an activity whose normal duration is 13 days can be shortened to 10 days for an added cost of $1,500, what is the crash cost per period? A. $15,000 B. $500 C. $13,000 D. $750 E. $1,500
A
Which of the following statements concerning CPM activities is false? A. The late finish of an activity is the earliest late start of all preceding activities. B. The late start of an activity is its late finish less its duration. C. The early start of an activity is the latest early finish of all preceding activities. D. The late finish is the earliest of the late start times of all successor activities. E. The early finish of an activity is the early start of that activity plus its duration.
A
Which of the following statements regarding CPM is true? A. All activities on the critical path have their LS equal to the maximum EF of all immediate predecessors. B. The critical path is that set of activities that has positive slack. C. The critical path is the shortest of all paths through the network. D. All activities on the critical path have their ES equal to their LF. E. Some networks have no critical path.
D
Which of the following statements regarding CPM networks is true? A. The early finish of an activity is the latest early start of all preceding activities. B. The late start of an activity is its late finish plus its duration. C. There can be multiple critical paths on the same project, all with different durations. D. If a specific project has multiple critical paths, all of them will have the same duration. E. None of the above are true.
B
Which of the following statements regarding PERT analysis is true? A. Project standard deviation is the sum of all critical activity standard deviations. B. Only critical activities contribute to the project variance. C. Project variance is the sum of all activity variances. D. The most likely time is equivalent to the expected activity time. E. Each activity has two estimates of its duration.
B
Which of the following statements regarding PERT times is true? A. The most likely time estimate is an estimate of the maximum time an activity will require. B. The optimistic time estimate is an estimate of the minimum time an activity will require. C. The pessimistic time estimate is an estimate of the minimum time an activity will require. D. The expected time estimate is calculated as t = (a + 4m + b). E. The optimistic time estimate is an estimate of the maximum time an activity will require.
B
Which of the following statements regarding PERT times is true? A. The pessimistic time estimate is an estimate of the minimum time an activity will require. B. The expected time estimate is calculated as t = (a + 4m + b)/6. C. The optimistic time estimate is an estimate of the maximum time an activity will require. D. The expected time is an estimate of the time an activity will require if everything goes as planned. E. The most likely time estimate is an estimate of the maximum time an activity will require.
B
Which of the following statements regarding critical paths is true? A. The duration of the critical path is the average duration of all paths in the project network. B. On a specific project, there can be multiple critical paths, all with exactly the same duration. C. The shortest of all paths through the network is the critical path. D. Some activities on the critical path may have slack. E. Every network has only one critical path.
A
Which of the following statements regarding time-cost tradeoffs in CPM networks is false? A. Crashing sometimes has the reverse result of lengthening the project duration. B. Crashing must consider the impact of crashing an activity on all paths in the network. C. A negative crash cost per period would imply that either crashing is cheaper than not crashing or that the crash time was slower than the normal time. D. Crashing shortens project duration by assigning more resources to critical tasks. E. Activities not on the critical path can become critical after crashing takes place.
E
Which of these statements regarding time-cost tradeoffs in CPM networks is true? A. The crash time always exceeds the normal time. B. Crashing is not possible unless there are multiple critical paths. C. Activities not on the critical path can never be on the critical path, even after crashing. D. Crashing a project often reduces the length of long-duration, but noncritical, activities. E. Crashing shortens the project duration by assigning more resources to one or more of the critical tasks.
