Question 1

Which of the following is not an effectiveness criterion for scheduling?

Accepted Answer

A) minimizing customer waiting time 
B) minimizing completion time 
C) minimizing WIP inventory 
D) maximizing utilization 
E) maximizing flow time 
A) minimizing customer waiting time 
B) minimizing completion time 
C) minimizing WIP inventory 
D) maximizing utilization 
E) maximizing flow time E

Question 2

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?

Accepted Answer

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 D

Question 3

Sequencing (or dispatching)

Accepted Answer

A) assigns dates to specific jobs or operations steps. 
B) assigns jobs to work centres. 
C) specifies the order in which jobs should be done at each centre. 
D) assigns workers to jobs. 
E) assigns workers to machines. 
A) assigns dates to specific jobs or operations steps. 
B) assigns jobs to work centres. 
C) specifies the order in which jobs should be done at each centre. 
D) assigns workers to jobs. 
E) assigns workers to machines. C

Question 4

Which of the following are limitations of rules-based dispatching systems?

Accepted Answer

A) Rules need to be revised to adjust to changes in orders,product mix,and so forth. 
B) Rules may not recognize idle resources. 
C) Rules may not recognize bottleneck resources 
D) Rules may not be able to prioritize two jobs with identical due dates. 
E) All of the above are limitations. 
A) Rules need to be revised to adjust to changes in orders,product mix,and so forth. 
B) Rules may not recognize idle resources. 
C) Rules may not recognize bottleneck resources 
D) Rules may not be able to prioritize two jobs with identical due dates. 
E) All of the above are limitations.

Question 5

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 hours are given in the table below.
a.What is the optimal sequence?
b.What is the total flow time for this sequence?
c.Which job is the first to be scheduled? Is it scheduled to be the first job or the last? Explain.

Accepted Answer

(a,b)The optimal sequence is G-B-A-C-F-E

Question 6

At Morgan's Transformer Rebuilding,a set of five jobs is ready for dispatching to a machine centre.The processing times and due dates for the jobs are given in the table below.Use shortest processing time to sequence the jobs,and calculate the average completion time,the average job lateness,and the average number of jobs in the machine centre.

Accepted Answer

The optimal sequence is C-E-B-A-D.The av

Question 7

Which file contains important information regarding an item's flow through the shop?

Accepted Answer

A) item master file 
B) work-centre master file 
C) control files 
D) routing file 
E) process file 
A) item master file 
B) work-centre master file 
C) control files 
D) routing file 
E) process file

Question 8

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 are given in the table below.
a.What is the optimal sequence?
b.What is the total flow time for this sequence?

Accepted Answer

(a,b)The optimal sequence is M

Question 9

Eight jobs have been sequenced at a single work centre.Total processing time for the eight jobs is 34 hours and total flow time for the sequence is 85 hours.For this schedule,utilization is ________ and average jobs in the system is ________.

Accepted Answer

A) 100% ;10.625 
B) low;.0941 
C) 0.400 or 40%;2.5 
D) 0.235 or 23.5%;4.25 
E) maximized;minimized 
A) 100% ;10.625 
B) low;.0941 
C) 0.400 or 40%;2.5 
D) 0.235 or 23.5%;4.25 
E) maximized;minimized

Question 10

What does Johnson's rule do?

Accepted Answer

Johnson's rule is an approach

Question 11

Using LPT priority would result in what sequence for Jobs A,B,C,and D if their process times are 4,6,5,2 respectively?

Accepted Answer

A) ABCD 
B) DCBA 
C) DACB 
D) DABC 
E) none of the above 
A) ABCD 
B) DCBA 
C) DACB 
D) DABC 
E) none of the above

Question 12

Five jobs are waiting for processing through two work centres.Their processing time (in minutes)at each work centre is contained in the table below.Each job requires work centre Sigma before work centre Delta.According to Johnson's rule,what sequence of jobs will minimize the completion time for all jobs?

Accepted Answer

A) R-S-T-U-V 
B) S-V-T-R-U 
C) S-U-T-V-R 
D) V-R-U-S-T 
E) none of the above 
A) R-S-T-U-V 
B) S-V-T-R-U 
C) S-U-T-V-R 
D) V-R-U-S-T 
E) none of the above

Question 13

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

Accepted Answer

The answer of ________ scheduling begins with the due date...

Question 14

Which of the following is an aid used to monitor jobs in process?

Accepted Answer

A) a Gantt load chart 
B) the assignment method 
C) a Gantt schedule chart 
D) Johnson's rule 
E) a Pareto chart 
A) a Gantt load chart 
B) the assignment method 
C) a Gantt schedule chart 
D) Johnson's rule 
E) a Pareto chart

Question 15

Gantt charts are useful for scheduling jobs,but not for loading them.

Accepted Answer

A) True 
 B)False

Question 16

If job 5 takes 3,4,or 5 hours to be completed by workers A,B,and C,respectively,what would the row values for job 5 be after performing Step 1A of the assignment method?

Accepted Answer

A) 3,4,5 
B) 8,9,10 
C) 0,1,2 
D) 6,7,8 
E) 1,4/3,5/3 
A) 3,4,5 
B) 8,9,10 
C) 0,1,2 
D) 6,7,8 
E) 1,4/3,5/3

Question 17

The correct sequence from longest to smallest duration scheduling is

Accepted Answer

A) capacity planning,aggregate planning,master schedule,short-term schedule. 
B) aggregate planning,capacity planning,master schedule,short-term schedule. 
C) master schedule,capacity planning,aggregate planning,short-term schedule. 
D) master schedule,aggregate planning,capacity planning,short-term schedule. 
E) aggregate planning,master schedule,capacity planning,short-term schedule. 
A) capacity planning,aggregate planning,master schedule,short-term schedule. 
B) aggregate planning,capacity planning,master schedule,short-term schedule. 
C) master schedule,capacity planning,aggregate planning,short-term schedule. 
D) master schedule,aggregate planning,capacity planning,short-term schedule. 
E) aggregate planning,master schedule,capacity planning,short-term schedule.

Question 18

The priority rule that sequences jobs using the smallest ratio of due date from today to processing time is

Accepted Answer

A) critical ratio. 
B) earliest due date. 
C) first come,first served. 
D) longest processing time. 
E) shortest processing time. 
A) critical ratio. 
B) earliest due date. 
C) first come,first served. 
D) longest processing time. 
E) shortest processing time.

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Air Canada uses mathematical short-term scheduling techniques and a high-tech nerve centre to manage the rapid rescheduling necessary to cope with weather delays and similar disruptions.

Accepted Answer

A) True 
 B)False

Exam 15: Short-Term Scheduling

Which of the following is not an effectiveness criterion for 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?

Sequencing (or dispatching)

Which of the following are limitations of rules-based dispatching systems?

Which file contains important information regarding an item's flow through the shop?

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 are given in the table below. a.What is the optimal sequence? b.What is the total flow time for this sequence?

Eight jobs have been sequenced at a single work centre.Total processing time for the eight jobs is 34 hours and total flow time for the sequence is 85 hours.For this schedule,utilization is ________ and average jobs in the system is ________.

What does Johnson's rule do?

Using LPT priority would result in what sequence for Jobs A,B,C,and D if their process times are 4,6,5,2 respectively?

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

Which of the following is an aid used to monitor jobs in process?

Gantt charts are useful for scheduling jobs,but not for loading them.

If job 5 takes 3,4,or 5 hours to be completed by workers A,B,and C,respectively,what would the row values for job 5 be after performing Step 1A of the assignment method?

The correct sequence from longest to smallest duration scheduling is

The priority rule that sequences jobs using the smallest ratio of due date from today to processing time is

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

Air Canada uses mathematical short-term scheduling techniques and a high-tech nerve centre to manage the rapid rescheduling necessary to cope with weather delays and similar disruptions.

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Sustainability in the Supply Chain and Design of Goods and Services

Managing Quality

Process Strategy and Sustainability

Location Strategies

Layout Strategies

Human Resources,job Design,and Work Measurement

Supply-Chain Management

Inventory Management

Aggregate Planning

Material Requirements Planning Mrpand ERP

Jit and Lean Operations

Maintenance and Reliability

Statistical Process Control

Capacity and Constraint Management

Supply Chain Management Analytics

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters

Eight jobs have been sequenced at a single work centre.Total processing time for the eight jobs is 34 hours and total flow time for the sequence is 85 hours.For this schedule,utilization is and average jobs in the system is .