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##### Operations Management Ch 15 & 16 Practice Problems

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Question;Question 1A single machine work center has five jobs assigned to it. They are labeled, in the order of theirarrival in the shop, as jobs A, B, C, D and E. The work center may work on only one job at atime and must complete any job it starts before starting another job. Job A has a processing timeof 6 days and is due to the customer in 9 days. Job B has a processing time of 2 days and is duein 16 days. Job C has a processing time of 4 days and is due in 10 days. Job D has a processingtime of 3 days and is due in 7 days. Job E has a processing time of 5 days and is due in 12 days.Using the first-come-first-served priority rule, what is the number of late (tardy) jobs?Answer0(zero)12345 pointsQuestion 2A single machine work center has five jobs assigned to it. They are labeled, in the order of theirarrival in the shop, as jobs A, B, C, D and E. The work center may work on only one job at atime and must complete any job it starts before starting another job. Job A has a processing timeof 6 days and is due to the customer in 9 days. Job B has a processing time of 2 days and is duein 16 days. Job C has a processing time of 4 days and is due in 10 days. Job D has a processingtime of 3 days and is due in 7 days. Job E has a processing time of 5 days and is due in 12 days.Using the shortest (earliest) due date rule, what is the average completion (flow) time of all jobs?Answer4.012.62.65 pointsQuestion 3A single machine work center has five jobs assigned to it. They are labeled, in the order of theirarrival in the shop, as jobs A, B, C, D and E. The work center may work on only one job at atime and must complete any job it starts before starting another job. Job A has a processing timeof 6 days and is due to the customer in 9 days. Job B has a processing time of 2 days and is duein 16 days. Job C has a processing time of 4 days and is due in 10 days. Job D has a processingtime of 3 days and is due in 7 days. Job E has a processing time of 5 days and is due in 12 days.Using the shortest processing (operating) time priority rule, what will be the average tardiness ofthese orders?Answer2.62.03.05 pointsQuestion 4A single machine work center has five jobs assigned to it. They are labeled, in the order of theirarrival in the shop, as jobs A, B, C, D and E. The work center may work on only one job at atime and must complete any job it starts before starting another job. Job A has a processing timeof 6 days and is due to the customer in 9 days. Job B has a processing time of 2 days and is duein 16 days. Job C has a processing time of 4 days and is due in 10 days. Job D has a processingtime of 3 days and is due in 7 days. Job E has a processing time of 5 days and is due in 12 days.Using the shortest processing (operating) time priority rule, what will be the average number ofjobs in the system?Answer5432.55 pointsQuestion 5A machine shop has two machines, M1 and M2. Four jobs A, B, C, and D need to be processedthrough machines M1 first and M2 second. Job A will take one hour on machine M1 and threehours on machine M2. Job B will take three hours on M1 and two hours on M2. Job C, takesseven hours on M1and three hours on M2. Job D, requires five hours on M1 and one hour onM2. Using Johnson's rule, in what order should these jobs be done? Select one of the followinganswers.AnswerABCDACBDDABCDACB5 pointsQuestion 6Consider the following data for a five-job, 2-machine, flow-shop problem. Find the value ofmake-span (minimum time to complete all jobs) using the sequence ABCDE. (Note: It issuggested that you draw the Gantt chart first.)TimeTimeJobM1M2A12B42C13D54E35Answer161920305 pointsQuestion 7Which of the following is a measure of whether the job is done ahead of, on, or behind schedule?Answeraverage number of jobs insystemmean flow timemakespanjob tardinessjob lateness5 pointsQuestion 8Suppose SPT rule is being used in a "dynamic" scheduling problem. There are five jobs A,B,C,D,and E ready to be processed at the present time. The processing times for the five jobs are 1, 9, 7,2, and 6 days respectively. A new job F will arrive on the 8th day. The processing time for job Fis 5 days. On which day (from present time) job F will be completed?Answer25141355 pointsQuestion 9Johnson's rule gives the optimal answer for which of the following type of problems?AnswerMinimize make span in a two machine flow shopMinimize make span in a two machine job shopMinimize make span in a single machine problemMinimize make span in both two machine flow and jobshops.5 pointsQuestion 10Which scheduling rule will minimize the average number of jobs in a single machine schedulingproblem?AnswerFirst Come First Served (FCFS)Earliest Due Date (EDD)Shortest Processing Time (SPT)Does not matter which rule you use. All rules will give the sameanswer.5 pointsQuestion 11Use the data given in the following table and the relationships between activities shown in theActivity on Node (AON) network. Find the project duration (earliest completion time of theproject).ActivityABCDEFGTime (days)5694934Answer21222528315 pointsQuestion 12Use the data given in the following table and the relationships between activities shown in theActivity on Node (AON) network. What is the latest start time of activity C if the projectcompletion time (due date) is set at 33 day?ActivityABCDEFGTime (days)5694934Answer5733Zero(0)5 pointsQuestion 13The data for a Time-Cost CPM Scheduling model analysis are given below. The times are indays. What is the minimum cost to complete this project in 14 days? (Hint: This problemrequires crashing).Activity Immediate PredecessorNormal Time Crash Time Normal Cost ($) Crash Cost ($)ANone4220004000BA4330006000CA2120002500DB and C4250005600ED3160009000Answer18,00027,10018,3003005 pointsQuestion 14You are working on a project that has 12 activities. You determine that the critical path consistsof only five activities. You then compute the variances for the five critical path activities andthese variances are 3, 4, 2, 1, and 6 days. The desired completion date for the project is 44 daysand the expected completion date for the project is 40 days. Which of the following alternativesgives the probability that the project will be completed by the desired completion date?AnswerClose to 1.0Close to0.3413Close to0.8413Close to0.5987Close to0.09875 pointsQuestion 15Suppose the length of critical path in a project is 50 days. The probability of completing theproject within 50 days is:AnswerLess than 50%Greater than 50%Equal to 50%Can not be determined from the abovedata5 pointsQuestion 16Suppose the length of critical path in a project is 40 days and the standard deviation is 2 days.What due date should be set for the project so that the probability of completing the project is95%? Round the answer to the nearest higher integer.Answer404144455 pointsQuestion 17The longest path in a network is called the critical path. Is it possible to have more than onecritical path in a network?Answeryesno5 pointsQuestion 18You have collected the data for a Time-Cost CPM Scheduling model analysis. The time is indays and the project "direct costs" are given below.The indirect costs for the project are determined on a daily duration basis and are given below:Activit ImmediateNormal TimeCrash TimeNormal Cost Crash CostyPredecessor(days)(days)($)($)ANone32300400BA33100100CA11200200DB and C32400550ED21500900FE33200200GF22100100Total indirect costs for 16 days of project duration: $ 600Total indirect costs for 15 days of project duration: $ 400Total indirect costs for 14 days of project duration: $ 200Total indirect costs for 13 days of project duration: $ 100At what project duration do we achieve the lowest total project cost (i.e., direct plus indirectcosts)?Answer16days15days14days13days5 pointsQuestion 19Consider a project having the following ten activities. What is the critical path?ActivityABCDEF GHIJImmediate PredecessorNone None A A, B C, D D C E, G E, F H, ITime (weeks)7356449865AnswerA-C-G-H-JA-B-C-D-E-F-GH-I-JA-D-E-H-JB-D-F-I-J5 pointsQuestion 20Consider a project having the following ten activities. What is the slack time of activity B?ActivityABCDEF GHIJImmediate PredecessorNone None A A, B C, D D C E, G E, F H, ITime (weeks)7356449865Answerzero811319

Paper#45919 | Written in 18-Jul-2015

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