Deck 22: Workcenter Scheduling

Question 1

Johnson's rule, a priority rule used in sequencing production jobs, is used only in production situations where we are dealing with one machine or one stage of production activity.

Answer 1

False
Explanation: Johnson's rule is used when there are n jobs to schedule on two machines.

Question 2

A backward schedule tells when an order must be started in order to be done by a specific date.

Answer 2

True
Explanation: Backward scheduling starts from some date in the future (possibly a due date) and schedules the required operations in reverse sequence.The backward schedule tells when an order must be started in order to be done by a specific date.

Question 3

A system that "backward schedules" is designed to determine and report the earliest date an order can be completed.

Answer 3

False
Explanation: Backward scheduling starts from some date in the future (possibly a due date) and schedules the required operations in reverse sequence.The backward schedule tells when an order must be started in order to be done by a specific date.

Question 4

The objective of Johnson's rule for job sequencing is to minimize flow time from the beginning of the first job until the completion of the last job.

Question 5

A shop-floor control system is a system that uses data from the shop floor as well as data processing files to maintain and communicate status information on shop orders and work centers.

Question 6

The LCFS and Johnson's priority rules are basically the same except LCFS uses due dates as a major determiner of job sequence.

Question 7

Using the random order or "whim" priority rule to sequence production jobs means that supervisors or operators select whichever job they feel like running.

Question 8

Shop-floor control (or production activity control) can involve reviewing the status and controlling the progress of orders as they are being worked on.

Question 9

Priority rules are the rules used to obtain a job sequence in production scheduling.

Question 10

In production scheduling, the process of determining which job to start first on some machine or in some work center is known as sequencing or priority sequencing.

Question 11

A work center is a physical area of the business in which productive resources are organized and work is completed.

Question 12

In infinite loading, no consideration is given directly to whether there is sufficient capacity at the resources required to complete the work, nor is the actual sequence of the work as done by each resource in the work center considered.

Question 13

The assignment method of job sequencing is a special case of the transportation method of linear programming.

Question 14

Theoretically, all schedules are feasible when finite loading is used.

Question 15

In finite loading, no consideration is given directly to whether there is sufficient capacity at the resources required to complete the work, nor is the actual sequence of the work as done by each resource in the work center considered.

Question 16

Initiating performance of scheduled work is commonly termed "dispatching" of orders.

Question 17

The FCFS priority rule used in sequencing production jobs will always result in a better solution than the LCFS rule.

Question 18

Under the STR/OP sequencing priority rule, orders with the jobs with the longest STR/OP are run first.

Question 19

The textbook underscores the importance of scheduling with the phrase "workflow equals cash flow, and scheduling lies at the heart of the process."

Question 20

Shop-floor control (or production activity control) can involve expediting late and critical orders.

Question 21

A material requirements planning system is an example of which of the following scheduling systems?

A)Infinite loading, backward scheduling
B)Finite loading, backward scheduling
C)Infinite loading, forward scheduling
D)Finite loading, forward scheduling
E)None of these

Question 22

For a mid-volume type of manufacturing, which of the following is the typical production scheduling approach?

A)Finite forward scheduling
B)Finite backward scheduling
C)Infinite forward scheduling
D)Infinite backward scheduling
E)Precision forward scheduling

Question 23

When work is scheduled in detail using the setup and run time required for each order, it is called which of the following?

A)Infinite loading
B)Finite loading
C)Machine-limited
D)Labor-limited
E)Johnson's rule

Question 24

When work is scheduled in detail using the setup and run time required for each order, then theoretically all schedules will be feasible.

Question 25

Which of the following is not an objective of work center scheduling?

A)Meeting due dates
B)Providing time for quality at the source
C)Minimizing setup time or cost
D)Minimizing work-in-process inventory
E)Minimizing lead time

Question 26

For a continuous-process type of manufacturing, which of the following is the typical production scheduling approach?

A)Finite forward scheduling
B)Finite backward scheduling
C)Infinite forward scheduling
D)Infinite backward scheduling
E)Shortest due date

Question 27

When work is assigned to a work center based on what is needed over time it is called which of the following?

A)Infinite loading
B)Finite loading
C)Machine-limited
D)Labor-limited
E)Johnson's rule

Question 28

When work has been scheduled in a shop that does not have sufficient resources to complete the schedule on time, the system that generated the schedule is called which of the following?

A)Infinite loading
B)Machine-limited
C)Finite loading
D)Labor-limited
E)Constrained

Question 29

MES and SES are acronyms for "manufacturing environment scheduler" and "service environment scheduler" systems, respectively.

Question 30

Which of the following is not a way in which a work center can be organized?

A)According to function in a work center configuration
B)According to function in an assembly line
C)By product in assembly line
D)As a group technology cell (GT cell)
E)By product in a flow operation

Question 31

Scheduling hourly work times using the "first-hour principle" ensures that no excess labor will be used during the work shift.

Question 32

The objectives of work center scheduling include which of the following?

A)Minimizing worker alienation
B)Providing variety to workforce
C)Following all the priority rules
D)Avoiding tradeoffs
E)Minimizing setup costs

Question 33

Which of the following is not a function performed in scheduling and controlling an operation?

A)Allocating orders and equipment
B)Setting priorities and sequencing jobs
C)Allocating personnel to work centers
D)Expediting late orders
E)Reporting bottleneck operations

Question 34

For a low-volume job shop type of manufacturing, which of the following is the typical production scheduling approach?

A)Finite forward scheduling
B)Finite backward scheduling
C)Infinite backward scheduling
D)Infinite forward scheduling
E)Soonest due date

Question 35

One of the principles of work center scheduling is to match work center input information to what the worker can actually do.

Question 36

One of the principles of work center scheduling is that, while certainty of standards, routings, and so forth is not entirely possible in a shop, certainty should always be an objective to work toward.

Question 37

For a high-volume type of manufacturing, which of the following is the typical production scheduling approach?

A)Finite backward scheduling
B)Finite forward scheduling
C)Infinite forward scheduling
D)Infinite backward scheduling
E)Assignment method

Question 38

Which of the following is not a standard measure of schedule performance that can be used to evaluate priority rules?

A)The schedule quality index
B)Minimizing the time a job spends in the process
C)Minimizing work-in-process inventory
D)Minimizing idle time of machines or workers
E)Meeting due dates of customers

Question 39

One of the principles of work center scheduling is that the effectiveness of any shop should be measured by speed of flow through the shop.

Question 40

One of the principles of work center scheduling is that once started, a job should not be interrupted.

Question 41

Which of the following is a priority rule used to schedule the sequence of jobs in a production operation?

A)Last-come, first-served
B)Last complaint first
C)First on hand first
D)Longest slack time first
E)Parts on hand first

Question 42

Which of the following is not one of the major functions of shop-floor control?

A)Measure efficiency, utilization, and productivity of manpower and machines.
B)Assign a priority to each shop order.
C)Load machine hours into workstations.
D)Track WIP quantity by location by shop order to accounting.
E)Convey shop order status information to the office.

Question 43

Assume there are five jobs (i.e., A, B, C, D, and E) that need to be sequenced in a production schedule.The remaining operating time necessary for completion of job A is 4 days (i.e., job A will take 4 more days to complete), B will take 7 days, C will take 8 days, D will take 2 days, and E will take 5 days.Which job should be scheduled first if you use the SOT priority rule for job sequencing?

A)A
B)B
C)C
D)D
E)E

Question 44

A job has 10 days of processing time left to do before completion, and today is the 5^th day of the month.If the job is due on the 15^th day of the month, what is its critical ratio?

A)3
B)2
C)1
D)0.8
E)- 0.8

Question 45

Assume you are sequencing jobs using Johnson's rule.A particular job requires 7 hours to assemble and then is followed by 8 hours in the painting department.Which of the following is where you would schedule this job?

A)As early as possible in the unfilled job sequence.
B)As late as possible in the unfilled job sequence.
C)The schedule would depend on the due date.
D)Does not matter.
E)Johnson's Rule does not apply.

Question 46

Which priority rule is so powerful that it has been called "the most important concept in the entire aspect of sequencing?" ______________________________________.

Question 47

Which of the following might be a status and exception report used in shop-floor control?

A)Absentee report
B)Quality failure report
C)Shortage lists
D)Expediting report
E)Union activity report

Question 48

Which of the following priority rules used in scheduling the sequence of production is calculated as the slack time remaining in the schedule divided by the number of remaining operations, with the smallest value being run first?

A)STR
B)Johnson's
C)STR/OP
D)LCFS
E)FCFS

Question 49

Which of the following priority rules used in scheduling the sequence of production is calculated as the time remaining before the due date minus the remaining processing time, with the smallest value being run first?

A)STR
B)CR
C)SOT
D)LCFS
E)EDD

Question 50

Which of the following is not a priority rule used to schedule the sequence of jobs in a production operation?

A)First-come, first-served
B)Shortest operating time
C)Last-in, first-out
D)Critical ratio
E)Slack-time-remaining per operation

Question 51

Assume there are five jobs (i.e., A, B, C, D, and E) that need to be sequenced in a production schedule.The remaining operating time necessary for completion of job A is 3 days (i.e., job A will take 3 more days to complete), B will take 9 days, C will take 6 days, D will take 5 days and E will take 8 days.In what order will these jobs be scheduled if using the SOT priority rule for job sequencing?

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

Question 52

A machine shop has two machines, A and
B.Four jobs need to be processed through machine A first and B second.Job 1 will take one hour on machine A and three hours on machine
B.Job 2 will take three hours on A and two hours on
B.Job 3, seven on A and three on
B.Job 4, five hours on A and one hour on
B.Using Johnson's rule, in what order should these jobs be done? ___________________________________.

Question 53

Assume you are sequencing jobs using Johnson's rule.A particular job requires 3 hours to assemble and then is followed by 2 hours in the painting department.Which of the following is where you would schedule this job?

A)As early as possible in the unfilled job sequence.
B)As late as possible in the unfilled job sequence.
C)The schedule would depend on the due date.
D)Does not matter.
E)Johnson's rule does not apply.

Question 54

Which of the following is a tool of shop-floor control?

A)The hours worked per employee report
B)The anticipated delay report
C)The permanent work-in-process report
D)Time and motion studies
E)Product and process control report

Question 55

Which of the following is one of the major functions of shop-floor control?

A)Observing the priorities set for each shop order
B)Keeping work-in-process inventory out of the way
C)Conveying shop-order status information to the office
D)Controlling cost and materials waste
E)Keeping the workforce fully utilized

Question 56

Which of the following is a principle of work center scheduling?

A)Once started, a job can and should be finished even if unavoidably interrupted.
B)Reschedule every day.
C)Achieve certainty in standards and routings.
D)Give work centers less to do then their maximum.
E)Assign the first worker to all of the days that require staffing.

Question 57

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the first-come, first-served priority rule, in what order should these jobs be undertaken? ___________________________________.

Question 58

A job has 5 days of processing time left to do before completion, and today is the 10^th day of the month.If the job is due on the 14^th day of the month, what is its critical ratio?

A)5
B)2
C)0.8
D)0.5
E)0.1

Question 59

The assignment method is useful in solving scheduling problems that have which of the following characteristics?

A)There are n jobs to be distributed to n machines or workers.
B)Each job can only be done on one particular machine.
C)Speed and efficiency are important.
D)The objective is to minimize cost and lateness of delivery.
E)The jobs have to go through more than one process.

Question 60

Assume there are five jobs (i.e., A, B, C, D, and E) that need to be sequenced in a production schedule.The remaining operating time necessary for completion of job A is 3 days (i.e., job A will take 3 more days to complete), B will take 9 days, C will take 6 days, D will take 5 days and E will take 8 days.Which job should be scheduled last if using the SOT priority rule for job sequencing?

A)A
B)B
C)C
D)D
E)E

Question 61

What is sub-optimization in scheduling? ______________________________________________.

Question 62

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the shortest operating time priority rule, what will be the average lateness of these orders? ______________________________________.

Question 63

What is dispatching? __________________________________________.

Question 64

Distinguish between forward scheduling and backward scheduling.

Question 65

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the slack time remaining priority rule, what will be the average lateness of these orders? _______________________________________.

Question 66

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the earliest due date (EDD) priority rule, in what order should these jobs be undertaken? _______________________________________.

Question 67

What is the difference between finite and infinite loading?

Question 68

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the shortest operating time priority rule, in what order should these jobs be undertaken? _________________________________.

Question 69

What is Johnson's rule?

Question 70

In the context of work assignment, what is infinite loading? ___________________________________________.

Question 71

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the slack time remaining priority rule, in what order should these jobs be undertaken? _______________________________________.

Question 72

A work center has five jobs assigned to it.They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and
E.The work center may work on only one job at a time and must complete any job it starts before starting another job.Job A has a processing time of 6 days and is due to the customer in 9 days.Job B has a processing time of 2 days and is due in 16 days.Job C has a processing time of 4 days and is due in 10 days.Job D has a processing time of 3 days and is due in 7 days.Job E has a processing time of 5 days and is due in 12 days.Using the earliest due date (EDD) priority rule, what will be the average lateness of these orders? _______________________________________.