OM $235$ Homework$-3$

Question $2.$ Consider the process for a store below.

a$.$ What is the bottleneck?

b$.$ What is the process capacity in customers per hour?

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c$.$ If the process is operating at capacity, what is the average amount of time between customers

completing the process and leaving the store in minutes?

For the remaining problems, assume customers arrive every $5$ minutes.

d$.$ What is the percent utilization of the clerks performing Operation A$?($Hint: the utilization of the

two clerks will be the same because they are in parallel.$)$

e$.$ What is the percent utilization of Charlie?

f$.$ What is the percent utilization of Dave?

g$.$ What is the rush order flowtime in minutes?

h$.$ If Erin leaves for the day and Bob covers for her, what is the new process capacity in customers

per hour?

Question $3.$ Are the statements below regarding Just$-$in$-$Time $($JIT$)$ processes true or false? Note: answering $$True$$ indicates

that the statements are always true.

a$.$ Utilization of non$-$bottleneck resources can reach $100\%$

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b$.$ Average WIP cannot keep growing indefinitely.

c$.$ Jobs start in the process at the same rate as they leave it$.$

d$.$ In real life JIT practice, there is never any WIP inventory.

Question $4.$ Are the statements below regarding starved processes true or false? Note: answering $$True$$ indicates that the

statements are always true.

a$.$ Jobs start in the process at the same rate as they leave it$.$

b$.$ There is never any WIP inventory

c$.$ The bottleneck resource has less than a $100\%$ utilization.

d$.$ The bottleneck resource always has the highest utilization.

e$.$ The flow time of any job is always the rush order flowtime.

Question $5.$ Which of the below is associated with increasing WIP and RMI inventories? Please indicate True or False.

a$.$ Defects generally decrease

b$.$ There is less free cash available to the firm.

c$.$ Flow time increases

d$.$ Process visibility increases.

e$.$ Warehousing costs increase.