Deck 16: Scheduling

Question 1

Splitting a large lot after one operation beyond a bottleneck operation would reduce the overall waiting time of the bottleneck operation.

Answer 1

False

Question 2

A schedule chart can be used to monitor job progress.

Answer 2

True

Question 3

Loading is the determination of which work centers should perform which jobs.

Answer 3

True

Question 4

"Flow-shop scheduling" is used in high volume systems.

Question 5

Sequencing is concerned with the order in which jobs are done, while loading is concerned with assigning jobs to work centers or workstations.

Question 6

Infinite loading and finite loading are two major approaches used to load work centers.

Question 7

The output of the system cannot exceed the output of the bottleneck operation(s).

Question 8

Input/output (I/O) control refers to monitoring the productivity changes since productivity is determined by the ratio of Output to Input.

Question 9

A Gantt chart is a basic scheduling tool but works best for high-volume systems.

Question 10

When operations are often bottlenecked, additional planned idle time will improve the throughput in those areas.

Question 11

As long as the bottleneck operations are used effectively idle time in non-bottleneck operations will not affect the overall productivity of the system.

Question 12

A schedule chart depicts the loading and idle times for a group of machines or departments.

Question 13

The assignment model seeks an optimum matching of tasks and resources.

Question 14

When orders exceed our capacity, priority rules are used to select which orders will be accepted.

Question 15

Scheduling in intermediate-volume systems has three basic issues: run size, timing, and sequence.

Question 16

Line balancing is a major factor in the design and scheduling of low volume systems because of batch processing.

Question 17

The quantity sent to a bottleneck operation could be split into two or more process batches to better utilize a bottleneck resource rather than process the entire batch.

Question 18

The elimination of idle time on both bottleneck and non-bottleneck operations must be accomplished to optimize output.

Question 19

A Gantt chart is a basic scheduling tool that is most useful in low-volume systems.

Question 20

The term loading, as used in scheduling, refers to choosing the order in which jobs will be processed in low-volume systems.

Question 21

In the decision-making hierarchy, scheduling decisions are the final step in the transformation process before actual output occurs.

Question 22

In a single work center, makespan improvement can be accomplished by selecting the optimal sequencing rule.

Question 23

Johnson's rule is a technique used to sequence jobs through a two-step work sequence.

Question 24

Priority rules are widely used to sequence jobs in high-volume systems.

Question 25

Makespan is the total time needed to complete a group of jobs.

Question 26

The theory of constraints has a goal of maximizing flow through the entire system.

Question 27

Batch process helps maximize worker efficiency.

Question 28

Bottlenecks may shift with the passage of time, so that different operations become bottleneck operations at different times.

Question 29

Priority rules generally assume that job setup cost is independent of processing sequence of jobs.

Question 30

Which of the following is not an example of a high-volume system?

A)aircraft manufacturing
B)magazine printing
C)petroleum refining
D)waste treatment
E)commercial donut baking

Question 31

If optimal sequencing through three work centers is desired, Johnson's Rule II is used rather than Johnson's Rule.

Question 32

A basic difference between scheduling in service systems and scheduling in manufacturing systems is the random nature of requests in manufacturing systems as opposed to more uniform requests in service systems.

Question 33

Which of the following is the last step in the capacity/scheduling chain?

A)product planning
B)process planning
C)capacity planning
D)aggregate planning
E)scheduling

Question 34

The SPT rule minimizes idle time for subsequent operations.

Question 35

Because scheduling is a matter of detailed execution, it has little impact on the operations strategy of an organization.

Question 36

Priority rules are used in low-volume systems to identify an optimal processing sequence.

Question 37

The SPT priority rule always results in the lowest average completion time.

Question 38

The assignment method is limited to a maximum of two jobs per resource.

Question 39

Scheduling pertains to:

A)hiring workers
B)process selection
C)buying machinery
D)timing the use of specific resources
E)determining the lowest cost

Question 40

A major disadvantage of the SPT rule is that it tends to make very short jobs wait for a long time while longer, more important jobs are processed.

Question 41

In an assignment method problem, if it takes Abe 3 hours to build a birdhouse and 4 hours for a doghouse, while Betty takes 4 hours for a birdhouse and 3 hours for a doghouse, what is the reduced cost (in hours) of assigning Abe to build the doghouse?

A)0 hours
B)1 hour
C)2 hours
D)3 hours
E)4 hours

Question 42

A scheduling technique used to achieve an optimum, one-to-one matching of tasks and resources is:

A)the assignment method
B)Johnson's rule
C)the optimum production technology method (OPT)
D)the appointment method
E)the reservation method

Question 43

Which of the following is not a measure for judging the effectiveness of a schedule sequence?

A)average number of jobs at the work center
B)total number of jobs at the work center
C)average completion (flow) time
D)average job tardiness
E)none of the above

Question 44

Effective scheduling cannot:

A)yield cost savings and improved productivity
B)reduce the need for expansion of facilities
C)improve customer service
D)eliminate the need to train employees
E)improve patient care in medical settings

Question 45

The matrix below shows relative costs for various job-machine combinations.Which set of pairs constitutes the minimum-cost solution using the Assignment method?

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

Question 46

Scheduled due dates are the result of:

A)promises to customers
B)MRP processing
C)managerial decisions
D)all of the above
E)our competitor's promises

Question 47

The priority rule where jobs are processed according to the smallest ratio of due date to processing time is:

A)CR
B)EEDD
C)FCFS
D)S/O
E)SPT

Question 48

A work center can be a ___________.

A)machine
B)group of machines
C)department
D)facility
E)all of the above

Question 49

Organizations with fixed, perishable capacity can benefit from _______.

A)Yield Management
B)Price increases
C)Constraints
D)Sub-optimization
E)Waiting lines

Question 50

In a task assignment situation, in how many different ways can five jobs be assigned to five machines?

A)1
B)5
C)25
D)120
E)3,125

Question 51

Average completion (flow) time for a schedule sequence at a work center is:

A)the sum of processing time divided by the number of jobs
B)the sum of jobs' flow times divided by the number of jobs
C)overall flow time divided by total processing time
D)total processing time plus total late time divided by number of jobs
E)the sum of flow time plus total late time divided by number of jobs

Question 52

The EDD priority rule usually does well with regard to _______.

A)Cost
B)Lateness
C)Overtime
D)Waste
E)Makespan

Question 53

Which of the following is not usually a characteristic of successful high-volume systems?

A)smooth workflow through the system
B)customized output
C)rapid repair of breakdowns
D)minimal quality problems
E)reliable supply schedules

Question 54

Based on the cost information given in the table below, which set of job-machine pairs reflects the minimum-cost solution using the Assignment method?

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

Question 55

The priority rule which will sequence jobs in the order they are received is _________.

A)EDD
B)LIFO
C)SPT
D)CR
E)FCFS

Question 56

The scheduling sequencing rule which always results in the lowest average completion (flow) time is the:

A)first come, first served (FCFS) rule
B)shortest processing time first (SPT) rule
C)earliest due date first (EDD) rule
D)least slack per operation first (S/O) rule
E)run until slack happens (RUSH) rule

Question 57

The two different approaches to load work centers in job-shop scheduling are:

A)load charts and schedule charts
B)Gantt charts and assignment method
C)infinite loading and finite loading
D)linear programming and makespan
E)none of the above

Question 58

Primary considerations in scheduling high-volume systems involve: (I) coordinating the flow of inputs
(II) overcoming the disruptions to planned outputs
(III) assigning workers to work centers

A)I and III
B)I and II
C)II and III
D)I, II, and III
E)II only

Question 59

The purpose of cyclical scheduling is to:

A)eliminate weekends and holidays
B)rotate schedules
C)add flexible hours
D)incorporate overtime
E)observe work patterns

Question 60

Which of the following is not an assumption of priority rules?

A)The set of jobs is known: no new jobs arrive after processing begins.
B)Setup time is independent of processing sequence.
C)Finite loading is assumed.
D)Processing times are deterministic.
E)No machine breakdowns are assumed.

Question 61

In an assignment model where there are fewer jobs than resources:

A)Dummy jobs are needed to solve the problem.
B)Dummy resources are needed to solve the problem.
C)The problem can't be solved using an assignment model.
D)The problem will have multiple optimum solutions.
E)The simplex method must be used to solve the problem.

Question 62

Use Johnson's Rule to determine the optimum processing sequence for the jobs listed below.Chart total throughput time.

Question 63

One disadvantage of appointment systems is:

A)Capacity can be adjusted by varying hours.
B)The customer's desired time may be already taken.
C)People generally accept it as fair.
D)It can reduce customer waiting time.
E)Appointments do not have to be all the same length.

Question 64

A manager must assign four engineers to projects, one to a project.The leader of Project C has indicated that he does not want engineer 2 or 3 on his project.Given the cost figures below for each project-engineer combination, and keeping in mind that two combinations are undesirable, determine assignments such that total cost will be minimized.

Question 65

The sequence that would result using the SPT rule is:

A)e-b-c-d-a
B)c-a-b-e-d
C)a-d-c-e-b
D)d-e-b-a-c
E)e-d-b-a-c

Question 66

A major difference between manufacturing and service systems in terms of scheduling is:

A)variability in arrival and service rates
B)processing cost per unit
C)the number of units to be processed
D)length of processing time
E)output rate

Question 67

Scheduling in service systems may involve scheduling:

A)the workforce.
B)the equipment.
C)(a) and (b).
D)customers.
E)all of the above.

Question 68

The costs to do each of the three jobs on three alternate pieces of equipment are given below.Determine the job-equipment combination that will minimize total cost.

Question 69

Determine the processing sequence for the six jobs shown below using Johnson's Rule.Calculate total throughput time.Can the makespan be reduced by splitting the latest job? If so, by how much?

Question 70

Given the following information concerning jobs awaiting processing at a single work center, what processing sequence will result if the critical ratio (C/R) rule is used?

Question 71

Given the following information concerning jobs awaiting processing at a single work center, what processing sequence will result if the critical ratio (CR) rule is used?

Question 72

For the jobs listed below, which processing sequence would result using Johnson's Rule?

A)c-a-d-b
B)b-d-a-c
C)a-b-c-d
D)d-c-b-a
E)c-a-b-d

Question 73

Using the cost information given in the table below, assign work crews to jobs so that total cost is minimized.

Question 74

Using the information below, determine the following:
(A) processing sequence using (1) SPT and (2) EDD rules
(B) average completion time and average job tardiness under each rule

Question 75

What is the optimum job sequence for the jobs listed below using Johnson's Rule?

A)e-g-f-d
B)d-g-f-e
C)d-f-g-e
D)e-d-f-g
E)f-e-d-g

Question 76

A scheduling rule used for sequencing jobs through two work centers is:

A)critical ratio rule
B)Johnson's rule
C)slack per operation rule
D)shortest processing time rule
E)Pareto rule

Question 77

Which sequencing rule is designed specifically to minimize job tardiness?

A)S/O
B)EDD
C)FCFS
D)SPT
E)LPT

Question 78

Scheduling in service systems often takes the form of:

A)appointment systems
B)reservation systems
C)(A) and (B)
D)makespan systems
E)all of the above

Question 79

Using the EDD rule, the sequence of jobs would be:

A)d-e-b-a-c
B)a-d-c-b-e
C)e-d-b-a-c
D)a-d-c-e-d
E)e-b-c-d-a

Question 80

Given the information below, determine the following:
(A) Processing sequence using (1) SPT and (2) EDD.
(B) Average completion time and average job tardiness using (1) SPT and (2) EDD.