Question 1

Short-term schedules are prepared

Accepted Answer

A)  directly from the aggregate plans 
B)  directly from the capacity plans 
C)  from inventory records for items that have been used up 
D)  from master schedules which are derived from aggregate plans 
E)  from the purchasing plans 
A)  directly from the aggregate plans 
B)  directly from the capacity plans 
C)  from inventory records for items that have been used up 
D)  from master schedules which are derived from aggregate plans 
E)  from the purchasing plans D

Question 2

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 A

Question 3

Bob Dresser operates a major appliance warranty service center. His operation has two check stations that are required at the end of every repair task performed by his appliance repair staff. These are the Functionality Review (FR) and the Overall Scan (OS). The FR must be performed successfully before the OS is begun. On Friday morning, six repair jobs are completed, awaiting these two inspection activities. Processing times are given in minutes.
   a. What is the optimal sequence of jobs for the objective of minimizing the total flow time?
b. Show your work, and document the sequence.
c. Chart the solution to this problem.
d. What jobs are being processed at time period 90?
e. What is the total flow time of this problem?

Accepted Answer

(a) The optimal sequence is F-D-B-A-C-E.
(b) Supporting work appears in the table below.   (c) The schedule appears in the chart below. (d) Job A is being processed at FR (Machine 1), while Job B is being processed at OS (e) Total flow time for the schedule is 185.   (Machine 2)

Question 4

Some firms have developed arrangements to literally "swap" employees with each other during their respective peak demand times.

Accepted Answer

A) True 
 B)False

Question 5

Conventional MRP uses time buckets that do not recognize capacity limits, and in fact ignores capacity issues. A more realistic scheduling system that includes work center capacities and other resource availabilities is

Accepted Answer

A)  aggregate planning 
B)  the master production schedule 
C)  finite capacity scheduling 
D)  the assignment method 
E)  level material use 
A)  aggregate planning 
B)  the master production schedule 
C)  finite capacity scheduling 
D)  the assignment method 
E)  level material use

Question 6

The objective of scheduling is to

Accepted Answer

A)  maximize quality 
B)  minimize cost 
C)  minimize response time 
D)  prioritize and allocate demand to capacity 
E)  minimize lead time 
A)  maximize quality 
B)  minimize cost 
C)  minimize response time 
D)  prioritize and allocate demand to capacity 
E)  minimize lead time

Question 7

In forward scheduling, jobs are scheduled as late as possible within the time allowed by the customer due dates.

Accepted Answer

A) True 
 B)False

Question 8

Jack's Refrigeration Repair is under contract to repair, recondition, and/or refurbish commercial and industrial icemakers from restaurants, seafood processors, and similar organizations. Jack currently has five jobs to be scheduled, shown in the order in which they arrived.
   a. Complete the following table. (Show your supporting calculations below).
b. Which dispatching rule has the best score for flow time?
c. Which dispatching rule has the best score for work-in-process (jobs in the system)?
d. Which dispatching rule has the best score for lateness?
e. What dispatching rule would you select? Support your decision.

Accepted Answer

(a) A summary of calculations appears in

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

What are the options available to operations personnel to manage facility work flow?

Accepted Answer

Options available to manage facility wor

Question 11

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 12

Which of the following dispatching rules ordinarily gives the best results when the criterion is lowest time for completion of the full sequence of jobs?

Accepted Answer

A)  shortest processing time (SPT) 
B)  critical ratio (CR) 
C)  first in, first out (FIFO) 
D)  first come, first served (FCFS) 
E)  longest processing time 
A)  shortest processing time (SPT) 
B)  critical ratio (CR) 
C)  first in, first out (FIFO) 
D)  first come, first served (FCFS) 
E)  longest processing time

Question 13

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 14

EDD stands for

Accepted Answer

A)  earliest due date 
B)  earliest design date 
C)  earliest detrimental date 
D)  earliest decision date 
E)  none of the above 
A)  earliest due date 
B)  earliest design date 
C)  earliest detrimental date 
D)  earliest decision date 
E)  none of the above

Question 15

Which of the following is not tracked by scheduling optimization systems used in retail stores?

Accepted Answer

A)  cars parked in the parking lot 
B)  individual store sales 
C)  transactions 
D)  units sold 
E)  customer traffic 
A)  cars parked in the parking lot 
B)  individual store sales 
C)  transactions 
D)  units sold 
E)  customer traffic

Question 16

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)  none of the above 
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)  none of the above

Question 17

An appliance manufacturer assembles icemakers in large batches. The operations manager would like to significantly reduce the batch size. What would you suggest?

Accepted Answer

A)  Use the SPT rule. 
B)  Use forward scheduling. 
C)  Use Gantt charts. 
D)  Use finite scheduling. 
E)  Develop level material use schedules. 
A)  Use the SPT rule. 
B)  Use forward scheduling. 
C)  Use Gantt charts. 
D)  Use finite scheduling. 
E)  Develop level material use schedules.

Question 18

The following jobs are waiting to be processed at your work center, which cleans valve body castings. Job numbers are assigned sequentially upon arrival in the facility (a missing number means that job does not require your work center). All dates are specified as days from Today.
   a. In what sequence should the jobs be processed according to the FCFS scheduling rule?
b. In what sequence should the jobs be processed according to the EDD scheduling rule?
c. In what sequence should the jobs be processed according to the SPT scheduling rule?
d. In what sequence should the jobs be processed according to the LPT scheduling rule?
e. In what sequence should the jobs be processed according to the critical ratio scheduling rule?

Accepted Answer

FCFS: 101, 102, 104, 107, 108

Question 19

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

Accepted Answer

A)  the assignment method 
B)  Johnson's rule 
C)  the CDS algorithm 
D)  the appointment method 
E)  the reservation method 
A)  the assignment method 
B)  Johnson's rule 
C)  the CDS algorithm 
D)  the appointment method 
E)  the reservation method

Question 20

A work center had actual input of 280 hours and actual output of 270 hours. What is the change in backlog?

Accepted Answer

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

Exam 15: Short-Term Scheduling

Short-term schedules are prepared

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

Some firms have developed arrangements to literally "swap" employees with each other during their respective peak demand times.

Conventional MRP uses time buckets that do not recognize capacity limits, and in fact ignores capacity issues. A more realistic scheduling system that includes work center capacities and other resource availabilities is

The objective of scheduling is to

In forward scheduling, jobs are scheduled as late as possible within the time allowed by the customer due dates.

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

What are the options available to operations personnel to manage facility work flow?

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

Which of the following dispatching rules ordinarily gives the best results when the criterion is lowest time for completion of the full sequence of jobs?

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

EDD stands for

Which of the following is not tracked by scheduling optimization systems used in retail stores?

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?

An appliance manufacturer assembles icemakers in large batches. The operations manager would like to significantly reduce the batch size. What would you suggest?

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

A work center had actual input of 280 hours and actual output of 270 hours. What is the change in backlog?

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