Exam 10: Project Scheduling: Lagging, Crashing, and Activity Networks

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An activity performed by a subcontractor is scheduled for 20 weeks at an anticipated cost of $100,000.Due to slippage on the critical path you need to reduce this activity by three weeks.If the subcontractor informs you that the activity can be completed in 16 weeks for $200,000,what is the slope for the activity?

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It costs $75 per day for each day that a construction crew is on site.The project manager determines that most activities can be crashed and has listed the crashing costs next to the minimum time for each activity.Use this information to determine the lowest cost for this project.All times given are in days. Normal Minimum Crash Cost Activity Time Time ( \/ day) Predecessor A 10 6 \ 70 - B 6 3 \ 40 - C 2 2 - B D 4 2 \ 60 C E 6 4 \ 80 A F 8 5 \ 90 D, E

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In order to accelerate completion of a project,the manager must crash critical path activities.

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Research has shown that,in general:

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The BEST approach to network representation of a large and hugely complex project is to:

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Dummy activities have a duration equal to the:

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What information is NOT included in the nodes for an AOA network?

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For large projects,network diagrams are more useful if they are completely detailed.

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What is the minimum completion cost of this project if there is a penalty of $1,000 for each day the project lasts longer than 27 days? Activity durations in days and crash costs in dollars are given in the table. Activity Reg Length Crash Reg Cength Cosash Cost Activity Reg Length Crash Reg Crash Cost Cost A 7 6 400 1,200 L 7 5 800 1,500 C 1 1 450 450 6 5 500 1,250 9 6 550 2,350 R 4 4 600 600 9 7 500 1,650 10 8 450 1,350  What is the minimum completion cost of this project if there is a penalty of $1,000 for each day the project lasts longer than 27 days? Activity durations in days and crash costs in dollars are given in the table.  \begin{array} { | l | l | l | l | l | l | l | l | l | l | }  \hline \text { Activity } & \begin{array} { l }  \text { Reg } \\ \text { Length } \end{array} & \text { Crash } & \begin{array} { l }  \text { Reg } \\ \text { Cength } \end{array} & \begin{array} { l }  \text { Cosash } \\ \text { Cost } \end{array} & \text { Activity } & \begin{array} { l }  \text { Reg } \\ \text { Length } \end{array} & \text { Crash } & \text { Reg } & \begin{array} { l }  \text { Crash } \\ \text { Cost } \\ \text { Cost } \end{array} \\ \hline \text { A } & 7 & 6 & 400 & 1,200 & \text { L } & 7 & 5 & 800 & 1,500 \\ \hline \text { C } & 1 & 1 & 450 & 450 & \mathbb { N } & 6 & 5 & 500 & 1,250 \\ \hline \mathrm { D } & 9 & 6 & 550 & 2,350 & \text { R } & 4 & 4 & 600 & 600 \\ \hline \mathrm { J } & 9 & 7 & 500 & 1,650 & \mathrm {~S} & 10 & 8 & 450 & 1,350 \\ \hline \end{array}

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A finish to start lag delay is usually shown:

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What are four criticisms and caveats to bear in mind as you develop a project activity network?

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Crashing costs for a project are governed by the function: 50t² + 100t where t represents the number of days crashed (see graph).The project manager wants to crash the project,and is willing to pay up to $1,000 per day saved.How many days can be saved before the per-day cost is too high? Crashing costs for a project are governed by the function: 50t² + 100t where t represents the number of days crashed (see graph).The project manager wants to crash the project,and is willing to pay up to $1,000 per day saved.How many days can be saved before the per-day cost is too high?

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When involved in a project involving many subcontractors:

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What is the early start time for activity C if it has the start to start relationship shown? What is the early start time for activity C if it has the start to start relationship shown?

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The critical path may not contain a dummy activity.

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   -Use the Gantt chart and the activity list to determine when resource 2 is free.  \begin{array} { | l | l | l | l | }  \hline \text { Activity } & \text { Resources } & \text { Activity } & \text { Resources } \\ \hline \text { A } & 1 & \text { F } & 1 \\ \hline \text { B } & 5 & \text { G } & 2 \\ \hline \text { C } & 4 & \text { H } & 5 \\ \hline \text { E } & 3 & T & 3 \\ \hline \end{array} -Use the Gantt chart and the activity list to determine when resource 2 is free. Activity Resources Activity Resources A 1 F 1 B 5 G 2 C 4 H 5 E 3 T 3

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Consider the project described by the table where all durations are in days and the costs in dollars.What is the minimum cost of completing this project in 150 days? Consider the project described by the table where all durations are in days and the costs in dollars.What is the minimum cost of completing this project in 150 days?

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The most common method for shortening activity durations involves the decision to:

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Which of these approaches will NOT accelerate the completion of a project?

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A project has the activity duration and cost information indicated in the table where all times are in weeks.There is a penalty of $6,000 per week for every week the project extends beyond 25 weeks.What is the lowest total cost duration for completing this project? A project has the activity duration and cost information indicated in the table where all times are in weeks.There is a penalty of $6,000 per week for every week the project extends beyond 25 weeks.What is the lowest total cost duration for completing this project?

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