d$)$ All of the above are true.

$3.$ Which of the following statements regarding PERT times is true?

a$.$ Optimistic time estimate is an estimate of the minimum time an activity will require.

b$.$ Oplimistic time estimate is an estimate of the maximum time an activity will require.

C$.$ The probable time estimate is calculated as $t=(a+4m+b)6.$

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.

$4.$ Which of the foltowing statements regarding critical paths is true?

a$.$ The shortest of all paths through the network is the critical path.

b$.$ Some activities on the critical path may have slack.

c$.$ Every network has exactly one critical path.

$(4)$ On a specific project, there can be multiple eritical 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.

$5.$ Which of the following statements regarding CPM is false?

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 EF$,$

c$.$ All of the above are false.

$6.$ 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 early finish of an activity is the early start of that activity plus its duration.

$($c$)$ The late finish is the earliest of the late start times of all successor activities.

d$.$ The late start of an activity is its late finish less its duration.

e$.$ The early start of an activity is the latest early finish of all preceding activities.

${}_j{A}_1$

Which of the following statements regarding CPM networks is true?

${}_T$

Ais a

a$.$ The early finish of an activity is the latest early start of all preceding activities.

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

$($c$.)$ On a specific project, there can be multiple critical paths, all of which will have exactly the same duration.

d$.$ A project does not have to have a critical path:

e$.$ All of the above are true.

Activities that are not on a PERT critical path but have little slack need to be monitored closely because

a$.$ PERT treats ail activities as equally important

$(6)$ near$-$critical paths could become critical paths with small delays in these activities

c$.$ they are causing the entire project to be delayed

d$.$ slack is undesirable and needs to be eliminated

c$.$ they have a high risk of not being completed

Instructor: Dr$.$ Abulghassem Masoud Alshaikh