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Exam 15: Short-Term Scheduling

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Question 51

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________ scheduling begins with the due date and schedules the final operation first and the other job steps in reverse order.

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Question 52

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Which scheduling technique should be employed when due dates are important for a job order?

A) forward scheduling
B) loading
C) dispatching
D) backward scheduling
E) master scheduling

F) A) and C)
G) A) and B)

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Question 53

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The following jobs are waiting to be processed at your work centre, which cleans valve body castings. Job numbers are assigned sequentially upon arrival in the facility (a missing number means that job does not require your work centre). All dates are specified as days from Today. $\begin{array} { | c | c | c | } \hline \text { Job } & \text { Due Date } & \begin{array} { c } \text { Duration } \\\text { (days) }\end{array} \\\hline 215 & 7 & 12 \\\hline 312 & 8 & 15 \\\hline 485 & 11 & 6 \\\hline 591 & 4 & 7 \\\hline 602 & 3 & 2 \\\hline\end{array}$ a. In what sequence should the jobs be processed according to the FCFS scheduling rule? b. In what sequence should the jobs be processed according to the EDD scheduling rule? c. In what sequence should the jobs be processed according to the SPT scheduling rule? d. In what sequence should the jobs be processed according to the LPT scheduling rule?

The assignment method is

Earliest due date is a shop floor dispatching (sequencing) rule that relates the time available to complete a job to the amount of work left to be completed.

________ is an input-output control system that uses cards to manage the amount of work in a work centre.

In what ways does the problem of scheduling service systems differ from that of scheduling manufacturing systems?

Use Johnson's rule to determine the optimal sequencing for the five jobs to be processed on two machines in a fixed order (Machine 1 before Machine 2). The processing times in days are given in the table below. a. What is the optimal sequence? b. What is the total makespan for this sequence? c. What is the total idle time for Machine 2?. $\begin{array} { | l | r | r | } \hline & \text { Machine 1 } & \text { Machine 2 } \\\hline \text { A } & 3 & 2 \\\hline \text { B } & 4 & 8 \\\hline \text { C } & 8 & 3 \\\hline \mathrm { D } & 1 & 7 \\\hline \mathrm { E } & 9 & 4 \\\hline \mathrm { F } & 5 & 5 \\\hline\end{array}$

The ________ is a special class of linear programming models that involves assigning tasks or jobs to resources.

The short-term scheduling activity called loading

The emergency room at a hospital estimates the following requirements for registered nurses (RNs) for the late night shift each week. Nurses work four consecutive days, then have off three days. $\begin{array} { | c | c | c | c | c | c | c | } \hline \text { Sunday } & \text { Monday } & \text { Tuesday } & \text { Wednesday } & \text { Thursday } & \text { Friday } & \text { Saturday } \\\hline 3 & 4 & 2 & 2 & 3 & 6 & 4 \\\hline\end{array}$ Perform cyclical scheduling on the data. (Note that you must identify three-day patterns of minimum requirements). How many RNs are required? How much extra capacity is required?

________ uses computerized short-term scheduling to overcome the disadvantages of rule-based systems by providing the user with interactive computing and graphical output.

How does short-term scheduling vary among the different process choices? Specifically, compare short-term scheduling at process-oriented, work cells, repetitive, and product-focused facilities.

If an assignment problem consists of 5 workers and 4 projects

There are two jobs to be assigned to two workers. If the profit for worker A on Job 1 is $5 and on Job 2 $8 and for worker B Job 1 profit is $10 and profit from job 2 is $12 how should the work be divided using the assignment method?

Which of the following is not a key benefit from effective scheduling?

In manufacturing scheduling, physical inventories of goods can buffer variations in demand, but service scheduling normally lacks that buffer because services are generally consumed at the same time they are delivered.

The jobs listed below needed to be completed. Assume that it is now day 140. If the jobs are sequenced according to longest processing time rule, what is the lateness of job A? $\begin{array} { | c | c | c | } \hline \text { Job } & \begin{array} { c } \text { Processing } \\\text { Time (days) }\end{array} & \begin{array} { c } \text { Job due date } \\\text { (days) }\end{array} \\\hline \text { A } & 20 & 180 \\\hline \text { B } & 30 & 200 \\\hline \text { C } & 10 & 175 \\\hline \text { D } & 16 & 230 \\\hline \text { E } & 18 & 210 \\\hline\end{array}$

Because facility capacity, set-up time, and run time are usually known, scheduling is often straightforward in ________ facilities.

What is the difference between a Gantt load chart and a Gantt scheduling chart?