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Exam 22: Scheduling

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Question 1

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Which of the following is least likely to be a source of disruption that results in less than the desired output in a high-volume system?

A) equipment failures
B) material shortages
C) accidents
D) worker absences
E) demand variability

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

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Question 2

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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: $\begin{array} { c c c } \text { Job } & \begin{array} { r } \text { Processing Time } \\\text { (hrs) }\end{array} & \begin{array} { c } \text { Due } \\\text { (hrs from now) }\end{array} \\\text { V } & 3 & 5 \\\text { W } & 1 & 1 \\\text { X } & 4 & 9 \\\text { Y } & 2 & 3 \\\text { Z } & 5 & 7\end{array}$ If Eva uses the shortest processing time first priority rule to schedule these jobs, what will be the average job tardiness?

A) 2 hours
B) 2.2 hours
C) 2.33 hours
D) 2.4 hours
E) 3 hours

F) B) and E)
G) None of the above

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Question 3

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A Gantt chart is a basic scheduling tool that works best for high-volume systems.

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: $\begin{array} { c c c } \text { Car } & \begin{array} { c } \text { Body Work } \\\text { (hrs) }\end{array} & \begin{array} { c } \text { Paint } \\\text { (hrs) }\end{array} \\\text { A } & 10 & 2 \\\text { B } & 5 & 4 \\\text { C } & 7 & 5 \\\text { D } & 3 & 6 \\\text { E } & 1 & 7\end{array}$ What is the idle time at the paint work center for the optimal schedule?

Line balancing is a major factor in the design and scheduling of low-volume systems because of batch processing.

Which of the following is not usually a characteristic of successful high-volume systems?

The following matrix shows relative costs for various job-machine combinations. Assume there must be one-to-one matching between jobs and machines. Which set of pairs constitutes the minimum-cost solution using the assignment method?

Effective scheduling cannot:

The EDD priority rule usually does well with regard to:

The president of a consulting firm wants to minimize the total number of hours it will take to complete four projects for a new client. Accordingly, she has estimated the time it should take for each of her top consultants-Charlie, Betty, Johnny, and Rick-to complete any of the four projects, as follows: Assume there must be one-to-one matching between consultants and projects. What is the optimal assignment of consultants to projects?

Scheduling pertains to:

Similar to that in manufacturing, the service scheduling hierarchy begins with __________ and ends with _________.

Input/output (I/O) control refers to monitoring the productivity changes since productivity is determined by the ratio of output to input.

Priority rules generally assume that job setup cost is independent of the processing sequence of jobs.

The purpose of cyclical scheduling is to:

A schedule chart can be used to monitor job progress.

A scheduling technique used to achieve an optimum matching of tasks and resources is:

A work center can be a: (I) machine. (II) group of machines. (III) department. IV) a part used to produce a product.

Priority rules are used in low-volume systems to identify an optimal processing sequence.

Which of the following is critical to effective yield management?