A manufacturer has the following jobs waiting on a single work center. The firm has not decided which dispatching rule to apply in order to prioritize the jobs and fix them into the schedule. Processing time in 15-minute time blocks and due date for each job are in the table below. \[\begin{array} { | c | c | c | } \hline & \text { Time } & \text { Due Date } \\ \hline \text { Job 1 } & 5 & 17 \\ \hline \text { Job 2 } & 4 & 20 \\ \hline \text { Job 3 } & 3 & 16 \\ \hline \text { Job 4 } & 7 & 9 \\ \hline \text { Job 5 } & 3 & 6 \\ \hline \text { Job 6 } & 5 & 7 \\ \hline \end{array}\] a. Complete the following table. Show your supporting calculations below. b. Which dispatching rule has the best score for flow time? for work in process (jobs in the system)? for lateness? c. Is there ANY sequence that can avoid all lateness? Explain or provide an example. $\begin{array}{|l|l|l|l|l|} \hline&&&\text { Average }\\ \text { Dispatching } & & \text { Average } & \text { Number of } & \text { Average } \\ \text { Rule } & \text { Tob Sequence } & \text { Flow Time } & \text { Jobs } & \text { Lateness } \\\hline \text { EDD } & \\ \hline \text { SPT } & \\ \hline \text { LPT } &\\ \hline \end{array}$

(a) The results appear in the table belo

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? \[\begin{array} { | c | c | c | } \hline \text { Job } & \begin{array} { c } \text { Processing } \\ \text { Time (days) } \end{array} & \begin{array} { c } \text { Job due date } \\ \text { (days) } \end{array} \\ \hline \text { A } & 20 & 180 \\ \hline \text { B } & 30 & 200 \\ \hline \text { C } & 10 & 175 \\ \hline \text { D } & 16 & 230 \\ \hline \text { E } & 18 & 210 \\ \hline \end{array}\]

A) 0.0 days B) 24.0 days C) 7.4 days D) 10.0 days E) 11.6 days A) 0.0 days B) 24.0 days C) 7.4 days D) 10.0 days E) 11.6 days

Exam 18: Short-Term Scheduling

Jack's Refrigeration Repair is under contract to repair, recondition, and/or refurbish commercial and industrial icemakers from restaurants, seafood processors, and similar organizations. Jack currently has five jobs to be scheduled, shown in the order in which they arrived. Job Processing Time (hours) Due (hours) 20 50 10 35 50 90 15 35 55 75 a. Complete the following table. (Show your supporting calculations below). b. Which dispatching rule has the best score for flow time? c. Which dispatching rule has the best score for work-in-process (jobs in the system)? d. Which dispatching rule has the best score for lateness? e. What dispatching rule would you select? Support your decision. Dispatching Rule Job Sequence Average Flow Time Average Number of Jobs Average Lateness FCFS SPT EDD CR

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Question 41

Explain, in your own words, what is meant by "level material use." In what types of facilities is it appropriate? Explain.

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Question 42

Given the following chart of jobs assigned with Johnson's rule suppose that all the jobs (A, B, C, etc) could be evenly divided into two tasks (such as A1 and A2, B1 and B2, etc). Suppose job D is split into two equivalently sized sections, D1 and D2, each with a body work time of 1.5 hours and a paint time of 2 hours (D1 and D2 sum to 3 hours of body work and 4 hours of paint which is equivalent to D). How much is makespan reduced by this splitting of D?

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Question 43

What is input-output control?

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Question 44

Which of the following statements regarding finite capacity scheduling (FCS) is False?

(Multiple Choice)

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Question 45

What are some limitations of rule-based scheduling systems? What alternatives are there to rules-based scheduling systems?

(Essay)

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Question 46

Identify the types of planning files used in scheduling decisions. Which are used in manual systems, and which are used in automated systems?

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Question 47

The short-term scheduling activity called loading

(Multiple Choice)

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Question 48

A scheduling technique used to achieve optimum, one-to-one matching of tasks and resources is

(Multiple Choice)

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Question 49

Dispatching rules are typically judged by four effectiveness criteria: average completion time, utilization, average number of jobs in the system, and average job lateness.

(True/False)

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Question 50

Process-focused facilities and repetitive facilities generate forward-looking schedules, but process-focused facilities do this with JIT and kanban while repetitive facilities generally use MRP.

(True/False)

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Question 51

The first step in level material use is to combine orders into a few large batches in order to utilize economies of scale.

(True/False)

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Question 52

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?

(Multiple Choice)

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Question 53

A method of input-output control that uses a system of cards to limit the amount of work at a work center and also to control lead time and monitor backlog is

(Multiple Choice)

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Question 54

Average completion time for a schedule sequence at a work center is the ratio of

(Multiple Choice)

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Question 55

Which of the following best describes the strategic importance of short-term scheduling?

(Multiple Choice)

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Question 56

A manufacturer has the following jobs waiting on a single work center. The firm has not decided which dispatching rule to apply in order to prioritize the jobs and fix them into the schedule. Processing time in 15-minute time blocks and due date for each job are in the table below. Time Due Date Job 1 5 17 Job 2 4 20 Job 3 3 16 Job 4 7 9 Job 5 3 6 Job 6 5 7 a. Complete the following table. Show your supporting calculations below. b. Which dispatching rule has the best score for flow time? for work in process (jobs in the system)? for lateness? c. Is there ANY sequence that can avoid all lateness? Explain or provide an example. Average Dispatching Average Number of Average Rule Tob Sequence Flow Time Jobs Lateness EDD SPT LPT

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Question 57

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? Job Processing Time (days) Job due date (days) A 20 180 B 30 200 C 10 175 D 16 230 E 18 210

(Multiple Choice)

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Question 58

Identify the disadvantages of the Gantt load chart.

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Question 59

Which of the following is true regarding services scheduling?

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Question 60

Exam 18: Short-Term Scheduling

Explain, in your own words, what is meant by "level material use." In what types of facilities is it appropriate? Explain.

What is input-output control?

Which of the following statements regarding finite capacity scheduling (FCS) is False?

What are some limitations of rule-based scheduling systems? What alternatives are there to rules-based scheduling systems?

Identify the types of planning files used in scheduling decisions. Which are used in manual systems, and which are used in automated systems?

The short-term scheduling activity called loading

A scheduling technique used to achieve optimum, one-to-one matching of tasks and resources is

Dispatching rules are typically judged by four effectiveness criteria: average completion time, utilization, average number of jobs in the system, and average job lateness.

Process-focused facilities and repetitive facilities generate forward-looking schedules, but process-focused facilities do this with JIT and kanban while repetitive facilities generally use MRP.

The first step in level material use is to combine orders into a few large batches in order to utilize economies of scale.

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?

A method of input-output control that uses a system of cards to limit the amount of work at a work center and also to control lead time and monitor backlog is

Average completion time for a schedule sequence at a work center is the ratio of

Which of the following best describes the strategic importance of short-term scheduling?

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? Job Processing Time (days) Job due date (days) A 20 180 B 30 200 C 10 175 D 16 230 E 18 210

Identify the disadvantages of the Gantt load chart.

Which of the following is true regarding services scheduling?

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