Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

When a set of jobs must pass through two workstations whose sequence is fixed, __________ is the sequencing rule most commonly applied.

Accepted Answer

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

Question 3

Scheduling optimization systems used in retail stores typically track customer traffic in 4-hour time increments.

Accepted Answer

A) True 
 B)False

Question 4

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 5

A firm that specializes in desktop publishing for local charities has agreed to take on the following jobs. The firm has not decided which dispatching rule to apply in order to prioritize the jobs and fix them into the schedule. All dates are specified as days from Today.
 $\begin{array}{lll}&\text { Time }&\text { Due Date }\
\text { Job 1 } & 20 & 25 \
\text { Job 2 } & 15 & 20 \
\text { Job } 3 & 7 & 16 \
\text { Job 4 } & 25 & 50 \
\text { Job 5 } & 31 & 33 \
\text { Job 6 } & 43 & 55
\end{array}$ 
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?
 $\begin{array}{|l|l|l|l|l|} 
\hline& & & \text { Average } & \
\text { Dispatching } & & \text { Average } & \text { Number of } & \text { Average } \
\text { Rule } & \text { Job Sequence } & \text { Flow Time } & \text { Jobs } & \text { Lateness } \
\hline \text { FCFS } & & & & \\hline \text { EDD } & \
\hline \text { SPT } & \
\hline \text { LPT } &\
\hline
\end{array}$

Accepted Answer

(a) The table of results appears below.

Question 6

__________ determines the order in which jobs should be done at each work center.

Accepted Answer

The answer of __________ determines the order in which jobs...

Question 7

Complete the table, find average lateness, find average completion time, and average number of jobs in the system. Assume all durations are in days and that the jobs are processed at the shop in the order that they arrive (A then B then C then D).
 $\begin{array}{|l|l|l|l|l|}
\hline \text { Tob } & \text { Process Time } & \text { Flow Time } & \text { Due Date } & \text { Lateness } \
\hline \text { A } & 5 & & & \\hline \mathrm{B} & 3 && 9 \
\hline \mathrm{C} & 2 && 12 \
\hline \mathrm{D} & 5 && 4 \
\hline \text { Sum } & 15(3.75) & \
\hline \text { Average) } & 15(3.75)&& \mathrm{XXXX} \
\hline
\end{array}$

Accepted Answer

@#IMG-DLM& 
Avg lateness = 11/4 = 2.75 d

Question 8

Five jobs are waiting to be processed. Their processing times and due dates are given below. Using the shortest processing time dispatching rule, in which order should the jobs be processed?
$$\begin{array} { | c | c | c | } 
\hline \text { Job } & \begin{array} { c } 
\text { Processing } \
\text { Time (days) }
\end{array} & \begin{array} { c } 
\text { Job due date } \
\text { (days) }
\end{array} \
\hline \text { A } & 4 & 7 \
\hline \text { B } & 7 & 4 \
\hline \text { C } & 8 & 11 \
\hline \text { D } & 3 & 5 \
\hline \text { E } & 5 & 8 \
\hline
\end{array}$$

Accepted Answer

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

Question 9

If an assignment problem consists of 6 workers and 7 projects,

Accepted Answer

A)  one worker will not get a project assignment 
B)  one worker will be assigned two projects 
C)  each worker will contribute work toward the seventh project 
D)  one project will not get a worker assigned 
E)  The problem cannot be solved by assignment method. 
A)  one worker will not get a project assignment 
B)  one worker will be assigned two projects 
C)  each worker will contribute work toward the seventh project 
D)  one project will not get a worker assigned 
E)  The problem cannot be solved by assignment method.

Question 10

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 11

In the sequence of decisions that affect scheduling, __________ is (are) the immediate follower of the master schedule (or master production schedule).

Accepted Answer

short-term

Question 12

Consider the arrival of patients into a public health clinic. Some patients are ill; some are injured; some are elderly; and some are very young. Some cases may be life-threatening, while others are inconsequential. How do the basic dispatch rules fall short in this situation?
 Design a dispatch rule for scheduling these patients.

Accepted Answer

First come, first served is inappropriat

Question 13

Find the sequence for the priority rules of
a. FCFS
b. SPT
c. EDD
d. LPT
Given the table below and the fact that today is the 1ˢᵗ
 $$\begin{array} { | l | l | l | } 
\hline \text { Job } & \text { Process Time } & \text { Due Date } \
\hline \text { A } & 6 & 10 \
\hline \text { B } & 4 & 2 \
\hline \text { C } & 8 & 5 \
\hline \text { D } & 9 & 16 \
\hline
\end{array}$$

Accepted Answer

a. ABCD
b.

Question 14

Three jobs are to be assigned to three machines. Cost for each job-machine combination appears in the table below. Perform the first two steps of the assignment method (subtract the smallest number in each row and subtract the smallest number in each column; then cover with straight lines). At this point in the problem-solving process $$\begin{array} { | l | l | l | l | } 
\hline & \text { Machine } & & \
& \text { A } & \text { Machine B } & \text { Machine C } \
\hline \text { Tob 1 } & 11 & 14 & 6 \
\hline \text { Job 2 } & 8 & 10 & 11 \
\hline \text { Tob 3 } & 9 & 12 & 7 \
\hline
\end{array}$$

Accepted Answer

A)  the row for Job 1 contains the values 5, 6, and 0 
B)  calculations are complete, and the problem is ready for an optimal set of assignments 
C)  the column for Machine B indicates that it should be retired 
D)  Job 1 should be performed on Machine B 
E)  Job 1 should be performed on Machine A 
A)  the row for Job 1 contains the values 5, 6, and 0 
B)  calculations are complete, and the problem is ready for an optimal set of assignments 
C)  the column for Machine B indicates that it should be retired 
D)  Job 1 should be performed on Machine B 
E)  Job 1 should be performed on Machine A

Question 15

Because facility capacity, set-up time, and run time are usually known, scheduling is often straightforward in __________ facilities.

Accepted Answer

product-fo

Question 16

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

Question 17

The benefits of effective scheduling include lower cost, faster delivery, and dependable delivery.

Accepted Answer

A) True 
 B)False

Question 18

__________ uses computerized short-term scheduling to overcome the disadvantages of rule-based systems by providing the user with interactive computing and graphical output.

Accepted Answer

Finite cap

Question 19

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 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 18: Short-Term Scheduling

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

When a set of jobs must pass through two workstations whose sequence is fixed, __________ is the sequencing rule most commonly applied.

Scheduling optimization systems used in retail stores typically track customer traffic in 4-hour time increments.

The objective of scheduling is to

__________ determines the order in which jobs should be done at each work center.

Five jobs are waiting to be processed. Their processing times and due dates are given below. Using the shortest processing time dispatching rule, in which order should the jobs be processed? Job Processing Time (days) Job due date (days) A 4 7 B 7 4 C 8 11 D 3 5 E 5 8

If an assignment problem consists of 6 workers and 7 projects,

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

In the sequence of decisions that affect scheduling, __________ is (are) the immediate follower of the master schedule (or master production schedule).

Find the sequence for the priority rules of a. FCFS b. SPT c. EDD d. LPT Given the table below and the fact that today is the 1ˢᵗ Job Process Time Due Date A 6 10 B 4 2 C 8 5 D 9 16

Because facility capacity, set-up time, and run time are usually known, scheduling is often straightforward in __________ facilities.

Short-term schedules are prepared

The benefits of effective scheduling include lower cost, faster delivery, and dependable delivery.

__________ uses computerized short-term scheduling to overcome the disadvantages of rule-based systems by providing the user with interactive computing and graphical output.

EDD stands for

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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