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Homework answers / question archive / Northern Arizona University MGT 301: Operations Management Spring 2010 Quiz: Chapter 3 1)The ES of an activity that has only one predecessor is simply the EF of that predecessor
Northern Arizona University
MGT 301: Operations Management
Spring 2010
Quiz: Chapter 3
1)The ES of an activity that has only one predecessor is simply the EF of that predecessor.
True False
2. By their very nature, projects have a limited lifetime, and that sets project management apart from the management of more traditional activities.
True False
3. One responsibility of a project manager is to make sure that the project meets its quality goals.
True False
4. Work Breakdown Structure is a useful tool in project management because it addresses the timing of individual work elements.
True False
5. Ethical issues which can arise in projects include bid rigging, bribery, and "low balling."
True False
6. Gantt charts give a timeline for each of a project's activities, but do not adequately show the interrelationships of activities.
True False
7. PERT, but not CPM, has the ability to consider the precedence relationships in a project.
True False
8. The shortest o f all paths through the network is the critical path.
True False
9. Slack is the amount of time an activity can be delayed without delaying the entire project.
True False
10. Every network has at least one critical path. True False
11. The critical path can be determined by use of either the "forward pass" or the "backward pass."
True False
12. In PERT analysis, the identification of the critical path can be incorrect if a noncritical activity takes substantially more than its expected time.
True False
13. Shortening the project's duration by deleting unnecessary activities is called "project crashing."
True False
14. In project management, crashing an activity must consider the impact on all paths in the network.
True False
15. The phases of project management are
a. planning, scheduling, and controlling
b. planning, programming, and budgeting
c. planning, organizing, staffing, leading, and controlling
d. different for manufacturing projects than for service projects
e. GANTT, CPM, and PERT
16. A project organization
a. is effective for companies with multiple large projects
b. is appropriate only in construction firms
c. often fails when the project cuts across organizational lines
d. is formed to ensure that programs (projects) get proper management and attention e. a and d are both true
17. Which of the following statements regarding Gantt charts is true?
a. Gantt charts give a timeline and precedence relationships for each activity of a project.
b. Gantt charts use the four standard spines of Methods, Materials, Manpower, and Machinery. c. Gantt charts are visual devices that show the duration of activities in a project.
d. Gantt charts are expensive.
e. All of the above are true.
18. Which of the following statements regarding CPM is true?
a. The critical path is the shortest of all paths through the network.
b. The critical path is that set of activities that has positive slack.
c. Some networks have no critical path.
d. All activities on the critical path have their LS equal their predecessor's EF.
e. All of the above are false.
19. 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=8.
a. The critical path is A-B-C, duration 15.
b. The critical path is A-C, duration 12.
c. The critical path is A-B-C, duration 13.5
d. The critical path cannot be determined without knowing PERT expected activity times.
e. The network has no critical path.
20. The time an activity will take assuming very unfavorable conditions is
a. the optimistic time b. the pessimistic time
c. the activity variance
d. the minimum time
e. exactly twice as long as the expected time
21. Which of the following statements regarding PERT times is true?
a. The optimistic time estimate is an estimate of the minimum time an activity will require.
b. The optimistic time estimate is an estimate of the maximum time an activity will require.
c. The probable time estimate is calculated as t = (a + 4m + b).
d. Pessimistic time estimate is an estimate of the minimum time an activity will require.
e. Most likely time estimate is an estimate of the maximum time an activity will require.
22. In a PERT network, non-critical activities that have little slack need to be monitored closely
a. because PERT treats all activities as equally important
b. because near-critical paths could become critical paths with small delays in these activities
c. because slack is undesirable and needs to be eliminated
d. because they are causing the entire project to be delayed
e. because they have a high risk of not being completed
23. An activity on a PERT network has these time estimates: optimistic = 2, most likely = 5, and pessimistic = 10. Its expected time is
a. 5 b. 5.33 c. 5.67
d. 17
e. none of these
24. Which of these statements regarding time-cost tradeoffs in CPM networks is true?
a. Crashing is not possible unless there are multiple critical paths.
b. Crashing a project often reduces the length of long-duration, but noncritical, activities.
c. Activities not on the critical path can never be on the critical path, even after crashing.
d. Crashing shortens the project duration by assigning more resources to one or more of the critical tasks.
e. None of the above is true.
25. Which of the following statements regarding time-cost tradeoffs in CPM networks is false?
a. "Project Crashing" shortens project duration by assigning more resources to critical tasks. b. Crashing sometimes has the reverse result of lengthening the project duration.
c. Crashing must consider the impact of crashing an activity on all paths in the network.
d. Activities not on the critical path can become critical after crashing takes place.
e. All of the above are true.
26. If an activity whose normal duration is 13 days can be shortened to 10 days for an added cost of
$1,500, the crash cost per period is a. $500
27. Two activities are candidates for crashing on a CPM network. Activity details are in the table below. To cut one day from the project's duration, activity should be crashed first, adding
to project cost.
Activity Normal Time Normal Cost Crash Duration Crash Cost
One 8 days $6,000 6 days $6,800
Two 10 days $4,000 9 days $5,000
a. One; $400
b. One; $6,800
c. Two; $1,000
d. Two; $5,000
e. One or two should be crashed; $1,400
28. Two activities are candidates for crashing on a CPM network. Activity details are in the table below. To cut one day from the project's duration, activity should be crashed first, adding
to project cost.
Activity Normal Time Normal Cost Crash Duration Crash Cost
B 4 days $6,000 3 days $8,000
C 6 days $4,000 4 days $6,000
a. B; $2,000
b. B; $8,000 c. C; $1,000 d. C; $2,000
e. C; $6,000
29. The Beta distribution is used in project management to
a. determine which activity should be crashed
b. calculate the probability that a project will be completed within its budget
c. calculate expected activity times
d. calculate slack for activities on the critical path
e. none of the above
30. The critical path for the network activities shown below is with duration .
Activity Duration Immediate Predecessors
A 4 ---
B 2 A
C 7 --
D 4 A
E 5 B,C,D
a. A-B-D; 10
b. A-B-E; 11
c. C-E; 12
d. A-D-E; 13
e. A-B-C-D-E; 22
31. The critical path for the network activities shown below is with duration .
Activity Duration Immediate Predecessors
A 2 --
B 4 --
C 6 A,B
D 1 A,B
E 2 B,C,D
a. A-D-E; 5
b. B-E; 6
c. B-D-E; 7
d. A-C-E; 10 e. B-C-E; 12
32. The expected activity time in PERT analysis is calculated as
a. the simple average of the optimistic, pessimistic, and most likely times
b. the weighted average of a, m, and b, with m weighted 4 times as heavily as a and b
c. the sum of the optimistic, pessimistic, and most likely times
d. the sum of the optimistic, pessimistic, and most likely times, divided by six
e. the sum of the activity variances, divided by six
33. A simple CPM network has five activities, A, B, C, D, and E. A is an immediate predecessor of C and of D. B is also an immediate predecessor of C and of D. C and D are both immediate predecessors of E.
a. There are two paths in this network. b. There are four paths in this network.
c. There are five paths in this network.
d. There are 25 paths through this network.
e. None of these statements is true.
34. Which of the following statements concerning CPM activities is false?
a. The early finish of an activity is the early start of that activity plus its duration.
b. The late finish is the earliest of the late start times of all successor activities.
c. The late start of an activity is its late finish less its duration.
d. The late finish of an activity is the earliest late start of all preceding activities.
e. The early start of an activity is the latest early finish of all preceding activities.
35. Which of the following statements regarding project management is true?
a. Both PERT and CPM require that network tasks have unchanging durations.
b. "Project crashing" shortens a project by assigning more resources to at least one critical task c. Crashing need not consider the impact of crashing an activity on other paths in the network.
d. Project crashing is an optimizing technique.
e. Crash cost depends upon the variance of the activity to be crashed.
