Ch. 3 HW & Quizzes

Which of the following statements regarding critical paths is​ true? A. On a specific​ project, there can be multiple critical​ paths, all with exactly the same duration. B. The shortest of all paths through the network is the critical path. C. Every network has only one critical path. D. The duration of the critical path is the average duration of all paths in the project network. E. Some activities on the critical path may have slack.

A. On a specific​ project, there can be multiple critical​ paths, all with exactly the same duration.

Which of the following statements regarding PERT times is​ true? A. The expected time estimate is calculated as t​ = ​(a​ + 4m​ + b​)/6. B. The optimistic time estimate is an estimate of the maximum time an activity will require. C. The most likely time estimate is an estimate of the maximum time an activity will require. D. The pessimistic time estimate is an estimate of the minimum time an activity will require. E. The optimistic time estimate is usually the same as the most likely time estimate.

A. The expected time estimate is calculated as t​ = ​(a​ + 4m​ + b​)/6.

The time an activity will take assuming very unfavorable conditions​ is: A. the pessimistic time. B. the minimum time. C. the optimistic time. D. the activity variance. E. exactly twice as long as the expected time.

A. the pessimistic time.

Which of the following statements regarding CPM is​ true? A. The critical path is that set of activities that has positive slack. B. All activities on the critical path have their LS equal to the maximum EF of all immediate predecessors. 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.

B. All activities on the critical path have their LS equal to the maximum EF of all immediate predecessors.

A simple CPM network has three​ activities, A,​ B, and C. A is an immediate predecessor of B and of C. B is an immediate predecessor of C. The activity durations are A=​4, B=​3, C=5. A. The critical path is​ A-C, duration 10.5 B. The critical path is​ A-B-C, duration 12. C. The network has no critical path. D. The critical path is​ A-B-C, duration 9. E. The critical path cannot be determined without knowing PERT expected activity times.

B. The critical path is​ A-B-C, duration 12.

Which of the following statements concerning CPM activities is​ false? A. The early start of an activity is the latest early finish of all preceding activities. B. The late finish of an activity is the earliest late start of all preceding activities. C. The early finish of an activity is the early start of that activity plus its duration. D. The late start of an activity is its late finish less its duration. E. The late finish is the earliest of the late start times of all successor activities.

B. The late finish of an activity is the earliest late start of all preceding activities.

Dummy activities A. have a duration equal to the shortest​ non-dummy activity in the network. B. are used when two activities have identical starting and ending events. C. cannot be on the critical path. D. are found in both AOA and AON networks.

B. are used when two activities have identical starting and ending events.

The critical path of a network is the A. path with the fewest activities. B. longest time path through the network. C. shortest time path through the network. D. path with the most activities.

B. longest time path through the network.

The three phases involved in the management of large projects are A. planning, scheduling, and evaluating. B. planning, scheduling, and controlling. C. ​scheduling, operating, and evaluating. D. scheduling, designing, and operating.

B. planning, scheduling, and controlling.

PERT analysis computes the variance of the total project completion time as A. the sum of the variances of all activities not on the critical path. B. the sum of the variances of all activities on the critical path. C. the sum of the variances of all activities in the project. D. the variance of the final activity of the project.

B. the sum of the variances of all activities on the critical path.

An activity on a PERT network has these time​ estimates: optimistic​ = 3, most likely​ = 5, and pessimistic​ = 10. What is its expected activity​ time? A. 3.00 B. 5.00 C. 5.50 D. 33.00 E. 6.00

C. 5.50

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. If a specific project has multiple critical​ paths, all of them will have the same duration. D. There can be multiple critical paths on the same​ project, all with different durations. E. None of the above are true.

C. If a specific project has multiple critical​ paths, all of them will have the same duration.

The main difference between PERT and CPM is​ that: A. PERT assumes that activity durations are known. B. CPM assumes activity durations can vary. C. PERT employs three time estimates for each activity. D. PERT ignores activity costs. E. PERT is more accurate than CPM.

C. PERT employs three time estimates for each activity.

Which of the following statements is an assumption PERT makes regarding the probability of finishing the project on​ time? A. Activity times are statistically dependent. B. Total project completion times follow a uniform probability distribution. C. Total project completion times follow a normal probability distribution. D. Activity times are statistically identical.

C. Total project completion times follow a normal probability distribution.

The critical path of a network is the A. shortest time path through the network. B. path with the most activities. C. longest time path through the network. D. path with the fewest activities.

C. longest time path through the network.

The most realistic estimate of the time required to complete an activity is referred to as​ what? A. optimistic time B. slack time C. most likely time D. pessimistic time

C. most likely time

he​ ________ distribution is used by PERT analysis to calculate expected activity times and variances. A. Normal B. Gaussian C. Binomial D. Beta E. Alpha

D. Beta

Which of the following statements regarding critical paths is​ true? A. Every network has only one critical path. B. Some activities on the critical path may have slack. C. The duration of the critical path is the average duration of all paths in the project network. D. On a specific​ project, there can be multiple critical​ paths, all with exactly the same duration. E. The shortest of all paths through the network is the critical path.

D. On a specific​ project, there can be multiple critical​ paths, all with exactly the same duration.

Which of the following statements regarding critical paths is​ true? A. Some activities on the critical path may have slack. B. Every network has only one critical path. C. The shortest of all paths through the network is the critical path. D. On a specific​ project, there can be multiple critical​ paths, all with exactly the same duration. E. The duration of the critical path is the average duration of all paths in the project network.

D. On a specific​ project, there can be multiple critical​ paths, all with exactly the same duration.

The most realistic estimate of the time required to complete an activity is referred to as​ what? A. pessimistic time B. slack time C. optimistic time D. most likely time

D. most likely time

Among the​ following, critical path and slack time analysis MOST help A. point out who is responsible for various activities. B. managers define the project activities. C. highlight relationships among project activities. D. pinpoint activities that need to be closely watched.

D. pinpoint activities that need to be closely watched.

Gantt charts are A. widely used network techniques. B. not easy to understand. C. not widely used. D. planning charts used to schedule resources and allocate time.

D. planning charts used to schedule resources and allocate time.

A​ contractor's project being analyzed by PERT has an estimated time for the critical path of 120 days. The sum of all activity variances is​ 81; the sum of variances along the critical path is 64. What is the probability that the project will take 130 or more days to​ complete? A. 0.85120 B. 0.89435 C. 0.13350 D.1.29 E. 0.10565

E. 0.10565

The difference between AON and AOA networks is​ that: A. AOA networks sometimes require dummy activities. B. nodes consume no resources or time in AOA networks. C. nodes designate activities in​ AON, while arrows designate activities in AOA. D. both are acceptable in​ practice; however, Microsoft Project uses AON. E. All of the above are true.

E. All of the above are true.

A simple CPM network has three​ activities, A,​ B, and C. A is an immediate predecessor of B and of C. B is an immediate predecessor of C. The activity durations are A=​4, B=​3, C=5. A. The critical path is​ A-B-C, duration 9. B. The critical path cannot be determined without knowing PERT expected activity times. C. The network has no critical path. D. The critical path is​ A-C, duration 10.5 E. The critical path is​ A-B-C, duration 12.

E. The critical path is​ A-B-C, duration 12.

A simple CPM network has three​ activities, A,​ B, and C. A is an immediate predecessor of B and of C. B is an immediate predecessor of C. The activity durations are A=​4, B=​3, C=5. A. The critical path is​ A-C, duration 10.5 B. The critical path cannot be determined without knowing PERT expected activity times. C. The network has no critical path. D. The critical path is​ A-B-C, duration 9. E. The critical path is​ A-B-C, duration 12.

E. The critical path is​ A-B-C, duration 12.