Question 1

One of the major limitations of the Gantt load chart is that it doesn't account for production variability such as unexpected breakdowns or human errors.

Accepted Answer

A) True 
 B)False

Question 2

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.

Accepted Answer

A) True 
 B)False

Question 3

What are some limitations of rule-based scheduling systems?

Accepted Answer

Three limitations are (1) Rules need to

Question 4

Five welding jobs are waiting to be processed. Their processing times and due dates are given below. Using the critical ratio dispatching rule, in which order should the jobs be processed? All dates are specified as days from today.

Accepted Answer

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

Question 5

Short-term scheduling is important to efficiency and to cost reduction, but its impact is not of strategic importance.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A)  ABCD 
B)  DCBA 
C)  DACB 
D)  DABC 
E)  BCAD 
A)  ABCD 
B)  DCBA 
C)  DACB 
D)  DABC 
E)  BCAD

Question 7

Alaska Airlines uses mathematical short-term scheduling techniques and a high-tech Flight Operations Department to manage the rapid rescheduling necessary to cope with weather delays and similar disruptions.

Accepted Answer

A) True 
 B)False

Question 8

A work center had actual input of 280 hours and actual output of 290 hours. What is the change in backlog?

Accepted Answer

A)  10 
B)  -10 
C)  0 
D)  1.037 
E)  Unable to determine with the given information 
A)  10 
B)  -10 
C)  0 
D)  1.037 
E)  Unable to determine with the given information

Question 9

A recent advance in short-term scheduling that makes use of expert systems and simulation in solving dynamic scheduling problems is:

Accepted Answer

A)  forward scheduling. 
B)  backward scheduling. 
C)  infinite scheduling. 
D)  finite capacity scheduling. 
E)  progressive scheduling. 
A)  forward scheduling. 
B)  backward scheduling. 
C)  infinite scheduling. 
D)  finite capacity scheduling. 
E)  progressive scheduling.

Question 10

The assignment method provides an optimum, one-to-one assignment of jobs to resources.

Accepted Answer

A) True 
 B)False

Question 11

Orders are processed in the sequence in which they arrive if (the) ________ rule sequences the jobs.

Accepted Answer

A)  earliest due date 
B)  slack time remaining 
C)  first come, first served 
D)  critical ratio 
E)  Johnson's 
A)  earliest due date 
B)  slack time remaining 
C)  first come, first served 
D)  critical ratio 
E)  Johnson's

Question 12

Which critical ratio value implies that a job is already late?

Accepted Answer

A)  more than 100 
B)  1 
C)  less than 1 
D)  10 
E)  3.4 
A)  more than 100 
B)  1 
C)  less than 1 
D)  10 
E)  3.4

Question 13

In services, the scheduling emphasis is usually on materials rather than staffing levels.

Accepted Answer

A) True 
 B)False

Question 14

Five jobs are waiting to be processed. Their processing times and due dates are given below. Using the earliest due date dispatching rule, in which order should the jobs be processed?

Accepted Answer

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

Question 15

The constant work-in-process (ConWIP) card aids input-output control by limiting the amount of work in a work center.

Accepted Answer

A) True 
 B)False

Question 16

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.
   (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.

Accepted Answer

(a) The results appear in the table belo

Question 17

Briefly describe how "the unexpected" makes short-term scheduling at Alaska Airlines a challenge. Also describe how Alaska Airlines meets that challenge and achieves competitive advantage through short-term scheduling.

Accepted Answer

The unexpected refers to delays and canc

Question 18

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

Accepted Answer

The Gantt load chart indicates a planned

Question 19

Which of the following dispatching rules tends to minimize job flow time?

Accepted Answer

A)  FCFS: first come, first served 
B)  SPT: shortest processing time 
C)  EDD: earliest due date 
D)  LPT: longest processing time 
E)  FCLS: first come, last served 
A)  FCFS: first come, first served 
B)  SPT: shortest processing time 
C)  EDD: earliest due date 
D)  LPT: longest processing time 
E)  FCLS: first come, last served

Question 20

A Gantt load chart shows the loading and idle time of several departments, machines, or facilities.

Accepted Answer

A) True 
 B)False

Exam 14: Short-Term Scheduling

One of the major limitations of the Gantt load chart is that it doesn't account for production variability such as unexpected breakdowns or human errors.

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.

What are some limitations of rule-based scheduling systems?

Five welding jobs are waiting to be processed. Their processing times and due dates are given below. Using the critical ratio dispatching rule, in which order should the jobs be processed? All dates are specified as days from today.

Short-term scheduling is important to efficiency and to cost reduction, but its impact is not of strategic importance.

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

Alaska Airlines uses mathematical short-term scheduling techniques and a high-tech Flight Operations Department to manage the rapid rescheduling necessary to cope with weather delays and similar disruptions.

A work center had actual input of 280 hours and actual output of 290 hours. What is the change in backlog?

A recent advance in short-term scheduling that makes use of expert systems and simulation in solving dynamic scheduling problems is:

The assignment method provides an optimum, one-to-one assignment of jobs to resources.

Orders are processed in the sequence in which they arrive if (the) ________ rule sequences the jobs.

Which critical ratio value implies that a job is already late?

In services, the scheduling emphasis is usually on materials rather than staffing levels.

Five jobs are waiting to be processed. Their processing times and due dates are given below. Using the earliest due date dispatching rule, in which order should the jobs be processed?

The constant work-in-process (ConWIP) card aids input-output control by limiting the amount of work in a work center.

Briefly describe how "the unexpected" makes short-term scheduling at Alaska Airlines a challenge. Also describe how Alaska Airlines meets that challenge and achieves competitive advantage through short-term scheduling.

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

Which of the following dispatching rules tends to minimize job flow time?

A Gantt load chart shows the loading and idle time of several departments, machines, or facilities.

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