Question 1

In the context of operations scheduling, total inventory is equal to:

Accepted Answer

A)  scheduled receipts plus on-hand inventories. 
B)  received orders minus scheduled receipts. 
C)  on-hand inventories plus received orders. 
D)  None of these is equal to total inventory. 
A)  scheduled receipts plus on-hand inventories. 
B)  received orders minus scheduled receipts. 
C)  on-hand inventories plus received orders. 
D)  None of these is equal to total inventory.

Question 2

Table J.12 The Feast
Janice prepares a medley of pastas for her brother Tony. Each of the pastas must first be rolled and then formed (or in some cases stuffed) before cooking. The required time on each machine in minutes is indicated in the table.
  
-Janice uses Johnson's rule to schedule her pasta production. What is the average flow time of her seven pastas?

Accepted Answer

A)  81 minutes 
B)  77 minutes 
C)  73 minutes 
D)  69 minutes 
A)  81 minutes 
B)  77 minutes 
C)  73 minutes 
D)  69 minutes

Question 3

Why is flow time an important measure of performance?

Accepted Answer

Minimizing job flow times in a schedule

Question 4

When choosing a priority sequencing rule:

Accepted Answer

A)  select multiple-dimension rules because they dominate single-dimension rules for all performance measures. 
B)  always select the rule that minimizes the amount of past-due jobs. 
C)  test a variety of rules before making a decision. 
D)  select CR or S/RO because they use more information. 
A)  select multiple-dimension rules because they dominate single-dimension rules for all performance measures. 
B)  always select the rule that minimizes the amount of past-due jobs. 
C)  test a variety of rules before making a decision. 
D)  select CR or S/RO because they use more information.

Question 5

Table J.2
Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester.
  
-Stu schedules his assignments using the critical ratio criterion. How many assignments are late?

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  6 
A)  3 
B)  4 
C)  5 
D)  6

Question 6

Table J.2
Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester.
  
-Develop an SPT sequence and calculate the average number of assignments Stu has this semester.

Accepted Answer

A)  3.36 
B)  3.52 
C)  3.78 
D)  3.94 
A)  3.36 
B)  3.52 
C)  3.78 
D)  3.94

Question 7

An appropriate objective for a manufacturing firm is to maximize total inventory.

Accepted Answer

A) True 
 B)False

Question 8

Critical ratio (CR) is a single-dimension priority rule.

Accepted Answer

A) True 
 B)False

Question 9

A rule that establishes a job's priority based on one piece of information, such as how long it will take to process or when the job arrived, is a(n) ________.

Accepted Answer

single-dim

Question 10

The percent of work time productively spent by an employee or a machine is called:

Accepted Answer

A)  activation. 
B)  efficiency. 
C)  effectiveness. 
D)  utilization. 
A)  activation. 
B)  efficiency. 
C)  effectiveness. 
D)  utilization.

Question 11

The earliest due date (EDD) rule gives the job with the shortest processing time the highest priority.

Accepted Answer

A) True 
 B)False

Question 12

Table J.8
Auto Data produces custom engineering testing equipment. The following six jobs are currently in the design department. The time since each one arrived, the processing time, and the due date are shown below. All times are expressed in terms of days. Let now be the beginning of Day 1.
  
-Using the information in Table J.8 and the FCFS rule, what is the average days past due?

Accepted Answer

A)  fewer than or equal to 5.0 days 
B)  greater than 5.0 days but fewer than or equal to 8.0 days 
C)  greater than 8.0 days but fewer than or equal to 9.0 days 
D)  greater than 9.0 days 
A)  fewer than or equal to 5.0 days 
B)  greater than 5.0 days but fewer than or equal to 8.0 days 
C)  greater than 8.0 days but fewer than or equal to 9.0 days 
D)  greater than 9.0 days

Question 13

Table J.18
  
-Use the information in Table J.18 and sequence the jobs using the EDD rule. What is the average flow time?

Accepted Answer

A)  fewer than or equal to 48 hours 
B)  greater than 48 hours but fewer than or equal to 50 hours 
C)  greater than 50 hours but fewer than or equal to 52 hours 
D)  greater than 52 hours 
A)  fewer than or equal to 48 hours 
B)  greater than 48 hours but fewer than or equal to 50 hours 
C)  greater than 50 hours but fewer than or equal to 52 hours 
D)  greater than 52 hours

Question 14

Table J.6
All of the following three jobs just arrived (end of hour 0) at Workstation A. They are the only ones waiting to be processed.
  
-Use the information in Table J.6. What is the job sequence at Workstation A, using the critical ratio rule?

Accepted Answer

A)  3-2-1 
B)  1-2-3 
C)  1-3-2 
D)  2-1-3 
A)  3-2-1 
B)  1-2-3 
C)  1-3-2 
D)  2-1-3

Question 15

Table J.17
A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table.
  
-Using the information in Table J.17 and Johnson's rule, develop a schedule that minimizes makespan for these seven jobs. Assume that job C could be neatly split into two equal parts, each having half of the processing time on each machine as the full job C. Using your original sequence, but splitting job C, what is the makespan for the seven jobs?

Accepted Answer

A)  between 58 and 59 days 
B)  between 56 and 57 days 
C)  between 55 and 56 days 
D)  between 57 and 58 days 
A)  between 58 and 59 days 
B)  between 56 and 57 days 
C)  between 55 and 56 days 
D)  between 57 and 58 days

Question 16

A first-come, first-served schedule minimizes the average flow time for all jobs.

Accepted Answer

A) True 
 B)False

Question 17

Table J.11
Work center Q45 has four jobs that just arrived (the start of Day 1) to be processed, as shown in the following table. Assume the shop works eight hours per day.
  
-Using the information in Table J.11 and the critical ratio rule, what should be the sequence of jobs processed at Q45?

Accepted Answer

A)  A-B-C-D 
B)  D-A-C-B 
C)  D-C-B-A 
D)  B-C-A-D 
A)  A-B-C-D 
B)  D-A-C-B 
C)  D-C-B-A 
D)  B-C-A-D

Question 18

Table J.8
Auto Data produces custom engineering testing equipment. The following six jobs are currently in the design department. The time since each one arrived, the processing time, and the due date are shown below. All times are expressed in terms of days. Let now be the beginning of Day 1.
  
-Using the information in Table J.8 and the SPT rule, what is the average days past due?

Accepted Answer

A)  fewer than or equal to 6.0 days 
B)  greater than 6.0 days but fewer than or equal to 7.0 days 
C)  greater than 7.0 days but fewer than or equal to 8.0 days 
D)  greater than 8.0 days 
A)  fewer than or equal to 6.0 days 
B)  greater than 6.0 days but fewer than or equal to 7.0 days 
C)  greater than 7.0 days but fewer than or equal to 8.0 days 
D)  greater than 8.0 days

Question 19

When using the critical ratio (CR) priority sequencing rule:

Accepted Answer

A)  a ratio of less than 1.0 implies that the job is ahead of schedule. 
B)  a ratio of less than 1.0 implies the job is behind schedule. 
C)  the job with the earliest due date is scheduled next. 
D)  the job with the highest CR is scheduled next. 
A)  a ratio of less than 1.0 implies that the job is ahead of schedule. 
B)  a ratio of less than 1.0 implies the job is behind schedule. 
C)  the job with the earliest due date is scheduled next. 
D)  the job with the highest CR is scheduled next.

Question 20

Consider this list of jobs that have just arrived and are ready for processing. They all require processing first on machine 1 and then on machine 2. Both machines are now idle. Develop a schedule that minimizes makespan and calculate this makespan time. Now assume that each job can be split into two jobs, each having half the duration on both machine 1 and machine 2. Using the original sequence that minimized average flow time, calculate the flow times for all split jobs What is the effect of this new schedule on the average flow time for these split jobs?

Accepted Answer

The original sequence and schedule follo

Exam 17: Supplement J Operations Scheduling

In the context of operations scheduling, total inventory is equal to:

Why is flow time an important measure of performance?

When choosing a priority sequencing rule:

Table J.2 Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester. -Stu schedules his assignments using the critical ratio criterion. How many assignments are late?

Table J.2 Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester. -Develop an SPT sequence and calculate the average number of assignments Stu has this semester.

An appropriate objective for a manufacturing firm is to maximize total inventory.

Critical ratio (CR) is a single-dimension priority rule.

A rule that establishes a job's priority based on one piece of information, such as how long it will take to process or when the job arrived, is a(n) ________.

The percent of work time productively spent by an employee or a machine is called:

The earliest due date (EDD) rule gives the job with the shortest processing time the highest priority.

Table J.18 -Use the information in Table J.18 and sequence the jobs using the EDD rule. What is the average flow time?

Table J.6 All of the following three jobs just arrived (end of hour 0) at Workstation A. They are the only ones waiting to be processed. -Use the information in Table J.6. What is the job sequence at Workstation A, using the critical ratio rule?

A first-come, first-served schedule minimizes the average flow time for all jobs.

Table J.11 Work center Q45 has four jobs that just arrived (the start of Day 1) to be processed, as shown in the following table. Assume the shop works eight hours per day. -Using the information in Table J.11 and the critical ratio rule, what should be the sequence of jobs processed at Q45?

When using the critical ratio (CR) priority sequencing rule:

Using Operations to Create Value

Process Strategy and Analysis

Quality and Performance

Capacity Planning

Constraint Management

Lean Systems

Project Management

Forecasting

Inventory Management

Operations Planning and Scheduling

Resource Planning

Supply Chain Design

Supply Chain Logistic Networks

Supply Chain Integration

Supply Chain Sustainability

Supplement A Decision Making

Supplement K Layout

Supplement B Waiting Lines

Supplement C Special Inventory Models

Supplement D Linear Programming

Supplement E Simulation

Supplement F Financial Analysis

Supplement G Acceptance Sampling Plans

Supplement H Measuring Output Rates

Supplement I Learning Curve Analysis

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