41
22) A service firm uses a level utilization production-planning horizon of six months. They have
developed a forecast for the coming six months that appears in the table. They can add no more than 33%
of their production capacity as overtime. What is the minimum cost sales and operations plan?
Answer: Quantities appear in the upper section of the spreadsheet; costs are totaled at the bottom of each
column.
42
23) A service firm uses a level utilization production-planning horizon of six months. They have
developed a forecast for the coming three quarters that appears in the table. They can add no more than
15% of their production capacity as overtime. What is the minimum cost sales and operations plan? Can
they deliver on their forecast?
Answer: Quantities appear in the upper section of the spreadsheet; costs are totaled at the bottom of each
column.
10.5 Scheduling
1) Scheduling involves generating a work schedule for employees or sequences of jobs or customers at
workstations.
2) The Gantt chart can be used as a tool for sequencing work on machines and monitoring its progress.
3) A rotating schedule calls for each employee to work the same days and hours each week.
4) A fixed schedule gives each employee the next employee’s schedule the following week.
5) Jobs processed using the first-come-first-served priority rule still permits them to be expedited.
6) Earliest due date (EDD) is a priority-sequencing rule that states the job requiring the shortest
processing time is the next job to be processed.
7) Flow time is only the time a job spends being processed, and excludes any time waiting to be
processed, equipment set up time and time spent moving between operations.
8) Advanced planning and scheduling systems (APS) seek to optimize resources across the supply chain
and align daily operations with strategic goals.
9) The workforce schedule:
A) determines when employees work.
B) determines how many workers are needed over an extended horizon.
C) determines the daily worker requirements.
D) specifies the specific task each worker is to do and when.
10) Gantt charts can be used to:
A) monitor the progress of jobs but cannot be used to sequence work on each machine.
B) sequence work on each machine but cannot be used to monitor the progress of each job.
C) monitor the progress of jobs and sequence work on each machine.
D) monitor the average number of defective parts generated by a machine on each job.
11) Job flow time is defined as the:
A) time of completion of a job plus the time it was available in a work station.
B) processing time to complete a particular job.
C) time of completion of the last job of a group minus the starting time of the first job.
D) amount of time by which a group of jobs missed their due dates.
12) The purpose of a rotating schedule is to:
A) assign each employee to work the same days and hours each week.
B) assign senior employees more opportunity to have weekends off.
C) deal with certain undesirable aspects of several individual workforce schedules.
D) make sure the legal constraints imposed on workforce schedules are satisfied.
13) Use the information in Table 10.4. What is the minimum number of workers required if preference is
given to the pair S-SU in case of a tie in the selection of off days?
A) fewer than eight workers
B) eight workers
C) nine workers
D) greater than nine workers
14) Use the information in Table 10.4. How much total slack will be generated from the schedule?
A) fewer than six days
B) six days
C) seven days
D) greater than seven days
Table 10.5
The daily requirements for highway patrol officers at Park City over the week are:
Day
M
T
W
TH
F
S
SU
Requirement
11
9
6
7
5
3
2
Each officer works five days a week and must have two consecutive days off.
15) Use the information in Table 10.5. What is the minimum number of officers required if preference is
given to the pair S-SU in case of a tie in the selection of off days?
A) 9
B) 10
C) 11
D) 12
16) Use the information in Table 10.5. How much total slack is generated from the schedule?
A) fewer than 9 days
B) 10 days
C) 11 days
D) greater than 11 days
Table 10.6
Bluebird University provides tutoring services for undergraduate students seven days a week. The daily
requirements for tutors are:
Day
M
T
W
TH
F
S
SU
Requirement
5
4
7
3
6
3
3
Each tutor works five days a week and must have two consecutive days off, according to the contract.
17) Use the information in Table 10.6. What is the minimum number of tutors required if preference is
given to the pair S-SU in case of a tie in the selection off days?
A) fewer than seven
B) seven
C) eight
D) nine
18) Use the information in Table 10.6. How many days will have slack capacity?
A) fewer than three
B) three
C) four
D) greater than four
Table 10.7
The framing department has six jobs waiting to be processed. It is now time zero and all jobs are ready to
begin. Each has only one operation remaining. All jobs arrived at the same time, and FCFS begins with
job A, then B, etc.
Job
Due Date
A
12
B
18
C
6
D
10
E
22
F
17
19) Using the information in Table 10.7 and the first-come, first-served (FCFS) rule, what is the average
days past due?
A) fewer than or equal to 6 days
B) greater than 6 days but fewer than or equal to 10 days
C) greater than 10 days but fewer than or equal to 14 days
D) greater than 14 days
20) Using the information in Table 10.7 and the earliest due date (EDD) rule, what is the average days
past due?
A) fewer than or equal to 5 days
B) greater than 5 days but fewer than or equal to 9 days
C) greater than 9 days but fewer than or equal to 13 days
D) greater than 13 days
Table 10.8
Suppose that the following eight jobs must be scheduled through a car repair facility (repair times are
shown in days):
Car
Due Date
A
11
B
9
C
10
D
8
E
17
F
35
G
13
H
23
21) Use the information in Table 10.8 to answer this question. What car is repaired the latest (the most
past due) if an SPT sequence is obeyed?
A) F
B) B
C) G
D) D
22) Use the information in Table 10.8 to answer this question. What car is repaired the latest (the most
past due) if an EDD sequence is obeyed?
A) F
B) E
C) G
D) H
23) Use the information in Table 10.8 to answer this question. What is the flow time of car B if an SPT
sequence is obeyed?
A) 31
B) 45
C) 41
D) 53
24) Use the information in Table 10.8 to answer this question. What is the flow time of car E if an EDD
sequence is obeyed?
A) 31
B) 44
C) 41
D) 53
25) Use the information in Table 10.8 to answer this question. Which job retains the same position in both
an EDD and an SPT sequence?
A) A
B) B
C) C
D) G
Table 10.10
A work center has the following six jobs waiting to be processed (all times are shown in days):
Job
Process Time
Due Date
A
8
24
B
2
11
C
6
31
D
12
25
E
7
8
26) Use the information in Table 10.10. Which job will be the first one completed if scheduling is done
using the first-come, first-served (FCFS) rule?
A) A
B) B
C) C
D) D
27) Use the information in Table 10.10. Which job will be the first one completed if scheduling is done
using the earliest due date (EDD) rule?
A) B
B) C
C) D
D) E
28) Use the information in Table 10.10. What is the average past due (in days) using the FCFS rule?
A) fewer than or equal to 2 days
B) greater than 2 days but fewer than or equal to 3 days
C) greater than 3 days but fewer than or equal to 4 days
D) greater than 4 days