Question 1

Consider a project that has been modeled as follows:
  
a.Draw the PERT/CPM network for this project and determine project's expected completion time and its critical path.
b.Can activities E and G be performed simultaneously without delaying the minimum project completion time?
c.Can one person perform A,G,and I without delaying the project?
d.By how much can activities G and L be delayed without delaying the entire project?
e.How much would the project be delayed if activity G was delayed by 7 hours and activity L was delayed by 4 hours? Explain.

Accepted Answer

The answer of Consider a project that has been modeled...

Question 2

The critical path

Accepted Answer

A) is any path that goes from the starting node to the completion node. 
B) is a combination of all paths. 
C) is the shortest path. 
D) is the longest path.

Question 3

Arcs in a project network indicate

Accepted Answer

A) completion times. 
B) precedence relationships. 
C) activities. 
D) the critical path.

Question 4

When activity times are uncertain,total project time is normally distributed with mean equal to the sum of the means of all of the critical activities.

Accepted Answer

A) True 
 B)False

Question 5

In deciding which activities to crash,one must

Accepted Answer

A) crash all critical activities. 
B) crash largest-duration activities. 
C) crash lowest-cost activities. 
D) crash activities on the critical path(s)only.

Question 6

The latest finish time for an activity is the largest of the latest start times for all activities that immediately follow the activity.

Accepted Answer

A) True 
 B)False

Question 7

To determine how to crash activity times

Accepted Answer

A) normal activity costs and costs under maximum crashing must be known. 
B) shortest times with crashing must be known. 
C) realize that new paths may become critical. 
D) All of the alternatives are true.

Question 8

When activity times are uncertain,

Accepted Answer

A) assume they are normally distributed. 
B) calculate the expected time,using (a + 4m + b)/6. 
C) use the most likely time. 
D) calculate the expected time,using (a + m + b)/3.

Question 9

PERT and CPM

Accepted Answer

A) are most valuable when a small number of activities must be scheduled. 
B) have different features and are not applied to the same situation. 
C) do not require a chronological relationship among activities. 
D) have been combined to develop a procedure that uses the best of each.

Question 10

The earliest finish time for the final activity is the project duration.

Accepted Answer

A) True 
 B)False

Question 11

A critical activity can be part of a noncritical path.

Accepted Answer

A) True 
 B)False

Question 12

The length of time an activity can be delayed without affecting the project completion time is the slack.

Accepted Answer

A) True 
 B)False

Question 13

Activities G,P,and R are the immediate predecessors for activity W.If the earliest finish times for the three are 12,15,and 10,then the earliest start time for W

Accepted Answer

A) is 10. 
B) is 12. 
C) is 15. 
D) cannot be determined.

Question 14

Which of the following is always true about a critical activity?

Accepted Answer

A) LS = EF. 
B) LF = LS. 
C) ES = LS. 
D) EF = ES.

Question 15

Consider the following PERT/CPM network with estimated times in weeks.The project is scheduled to begin on May 1.  The three-time estimate approach was used to calculate the expected times and the following table gives the variance for each activity:
  
a.Give the expected project completion date and the critical path.
b.By what date are you 99% sure the project will be completed?

Accepted Answer

The answer of Consider the following PERT/CPM network with estimated...

Question 16

Activities K,M and S immediately follow activity H,and their latest start times are 14,18,and 11.The latest finish time for activity H

Accepted Answer

A) is 11. 
B) is 14. 
C) is 18. 
D) cannot be determined.

Question 17

Which of the following is a general rule for crashing activities?

Accepted Answer

A) Crash only non-critical activities. 
B) Crash activities with zero slack. 
C) Crash activities with the greatest number of predecessors. 
D) Crash the path with the fewest activities.

Question 18

The earliest start time for an activity is equal to the smallest of the earliest finish times for all its immediate predecessors.

Accepted Answer

A) True 
 B)False

Question 19

When activity times are uncertain,an activity's most likely time is the same as its expected time.

Accepted Answer

A) True 
 B)False

Question 20

Crashing refers to an unanticipated delay in a critical path activity that causes the total time to exceed its limit.

Accepted Answer

A) True 
 B)False

Exam 13: Project Scheduling: Pertcpm

The critical path

Arcs in a project network indicate

When activity times are uncertain,total project time is normally distributed with mean equal to the sum of the means of all of the critical activities.

In deciding which activities to crash,one must

The latest finish time for an activity is the largest of the latest start times for all activities that immediately follow the activity.

To determine how to crash activity times

When activity times are uncertain,

PERT and CPM

The earliest finish time for the final activity is the project duration.

A critical activity can be part of a noncritical path.

The length of time an activity can be delayed without affecting the project completion time is the slack.

Activities G,P,and R are the immediate predecessors for activity W.If the earliest finish times for the three are 12,15,and 10,then the earliest start time for W

Which of the following is always true about a critical activity?

Activities K,M and S immediately follow activity H,and their latest start times are 14,18,and 11.The latest finish time for activity H

Which of the following is a general rule for crashing activities?

The earliest start time for an activity is equal to the smallest of the earliest finish times for all its immediate predecessors.

When activity times are uncertain,an activity's most likely time is the same as its expected time.

Crashing refers to an unanticipated delay in a critical path activity that causes the total time to exceed its limit.