Exam 5: Network Modeling
Exam 1: Introduction to Modeling and Decision Analysis52 Questions
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Exam 5: Network Modeling72 Questions
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Exam 7: Goal Programming and Multiple Objective Optimization59 Questions
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A company needs to ship 100 units from Roanoke to Washington at the lowest possible cost. The costs associated with shipping between the cities are:
From Lexington Washingtan Charlottesville Roanoke 50 - 80 Lexington - 50 40 Charlotterville - 30 Draw the network representation of this problem.
(Essay)
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Draw the network representation of the following network flow problem.
MIN: 5+3+2+3+2
Subject to:
---=-10 -= -= ++=5 \geq far all i and j
(Essay)
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An oil company wants to create lube oil, gasoline and diesel fuel at two refineries. There are two sources of crude oil. Consider arc 2-4. The per unit shipping cost of crude B from source 2 (node 2) to refinery 2 (node 4) is $11 and the yield is 85 percent. The following network representation depicts this problem. What is the balance of flow constraint for node 3 (Refinery 1)? 

(Multiple Choice)
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A manufacturing company has a pool of 50 labor hours. A customer has requested two products, Product A and Product B, and has requested 15 and 20 of each respectively. It requires 2 hours of labor to produce Product A and 3 hours of labor to produce Product B. The company can obtain up to 50 additional hours of labor if required. In-house labor costs $25 per hour while contracted labor costs $45 per hour. The following network flow model captures this problem.
Write out the LP formulation for this problem.

(Essay)
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Supply quantities for supply nodes in a transshipment problem are customarily indicated by
(Multiple Choice)
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The number of constraints in network flow problems is determined by the number of
(Multiple Choice)
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A company wants to determine the optimal replacement policy for its photocopier. The company does not keep photocopiers longer than 4 years. The company has estimated the annual costs for photocopiers during each of the 4 years and developed the following network representation of the problem.
Write out the LP formulation for this problem.


(Essay)
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An oil company wants to create lube oil, gasoline and diesel fuel at two refineries. There are two sources of crude oil. The following Excel spreadsheet shows this problem. What formula should be entered in cell E6 (and copied to cells E7:E15) in this spreadsheet?


(Short Answer)
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Demand quantities for demand nodes in a transshipment problem are customarily indicated by
(Multiple Choice)
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An oil company wants to create lube oil, gasoline and diesel fuel at two refineries. There are two sources of crude oil. The following network representation depicts this problem.
Write out the LP formulation for this problem.

(Essay)
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An oil company wants to create lube oil, gasoline and diesel fuel at two refineries. There are two sources of crude oil. Consider arc 2-4. The per unit shipping cost of crude B from source 2 (node 2) to refinery 2 (node 4) is $11 and the yield is 85 percent. The following flowchart depicts this problem. What is the balance of flow constraint for node 7 (Diesel)? 

(Multiple Choice)
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Which method is preferred for solving minimal spanning tree problems?
(Multiple Choice)
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