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Exam 22: Scheduling

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Question 41

Multiple Choice

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The operations manager of a body and paint shop has five cars to schedule for repair. He would like to minimize the makespan to complete all work on these cars. Each car requires body work prior to painting. The estimates of the times required to do the body and paint work on each are as follows: What is the makespan for the optimal schedule?

A) 24 hours
B) 25 hours
C) 26 hours
D) 28 hours
E) 50 hours

F) C) and D)
G) B) and C)

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Question 42

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As long as the bottleneck operations are used effectively, idle time in non-bottleneck operations will not affect the overall productivity of the system.

A) True
B) False

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Question 43

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Which of the following is present in the manufacturing scheduling hierarchy but is absent in the service scheduling hierarchy?

Priority rules are widely used to sequence jobs in high-volume systems.

Ensuring that the constraining resource is used to its maximum is an example of constraint:

Job X arrived at work center Q at noon. At 2 p.m. that same day X was begun. X left work center Q at 3:15 p.m. that same day. X's flow time, in minutes, was:

In a task assignment situation, in how many different ways can five jobs be assigned to five machines if each job must be assigned to each machine and each machine must be assigned one job?

Average completion (flow) time for a schedule sequence at a work center is:

When orders exceed our capacity, priority rules are used to select which orders will be accepted.

The assignment model seeks an optimum matching of tasks and resources.

The owner/operator of the local franchise of Handyman, Inc., has four jobs to do today, shown in the order they were received: $\begin{array} { c c c } \hline \text { Job } & \begin{array} { c } \text { Processing Time } \\\text { (hrs) }\end{array} & \begin{array} { c } \text { Due } \\\text { (hrs from now) }\end{array} \\\text { W } & 4 & 4 \\\text { X } & 3 & 5 \\\text { Y } & 2 & 2 \\\text { Z } & 1 & 1\end{array}$ If he uses the first come, first served priority rule to schedule these jobs, what will be the average completion time?

The SPT priority rule always results in the lowest average completion time.

In a single work center, makespan improvement can be accomplished by selecting the optimal sequencing rule.

There are four resources and four jobs to be done. Assume there must be one-to-one matching between jobs and resources. The time required for each resource to do each job is as follows: $\begin{array} { c c c c c } & { \text { Job (Hours) } } \\\text { Resource } & \text { A } & \text { B } & \text { C } & \text { D } \\1 & 5 & 8 & 7 & 7 \\2 & 4 & 9 & 5 & 9 \\3 & 6 & 9 & 8 & 7 \\4 & 7 & 6 & 6 & 9\end{array}$ What is the optimal assignment of resources to jobs?

The owner/operator of the local franchise of Handyman, Inc., has four jobs to do today, shown in the order they were received: $\begin{array} { c c c } \text { Job } & \begin{array} { c } \text { Processing Time } \\\text { (hrs) }\end{array} & \begin{array} { c } \text { Due } \\\text { (hrs from now) }\end{array} \\\text { W } & 4 & 4 \\\text { X } & 3 & 5 \\\text { Y } & 2 & 2 \\\text { Z } & 1 & 1\end{array}$ If he uses the shortest processing time first priority rule to schedule these jobs, what will be the average job tardiness?

Which sequencing rule is designed specifically to minimize job tardiness?

Eva, the owner of Eva's Second Time Around Wedding Dresses, currently has five dresses to be altered, shown in the order in which they arrived: $\begin{array} { c c c } \hline \text { Job } & \begin{array} { c } \text { Processing Time } \\\text { (hrs) }\end{array} & \begin{array} { c } \text { Due } \\\text { (hrs from now) }\end{array} \\\text { V } & 3 & 5 \\\text { W } & 1 & 1 \\\text { X } & 4 & 9 \\\text { Y } & 2 & 3 \\\text { Z } & 5 & 7\end{array}$ If Eva uses the shortest processing time first priority rule to schedule these jobs, what will be the average number of jobs in her shop today?

The scheduling sequencing rule which always results in the lowest average completion (flow) time is the:

Which of the following is not an example of a high-volume system?

Loading is the determination of which work centers should perform which jobs.