Type of layouts
True or false : A job shop is for a hight variety of customized products with a high production volume.
False : A job shop is for a hight variety of customized products with a low production volume.
True or false: The time required to complete all the jobs
is called the takt time.
False: it is the makespan
Take time: tells you ā given a desired output rate ā what the largest feasible cycle time should be in order to guarantee this desired output.
The formula for the theoretical minimum number of workstations is :
total task time divided by the takt time, rounded up to the nearest whole number
True
True or false: In real-world assembly line balancing, eliminating workstations is often the main optimization goal.
False : The goal is usually to equalize or smooth workloads, since workstations have unique identities and constraints.
Which of these product is typically not created on assembly lines?
a) cars
b) washing machine
c) wedding dresses
d) TV's
c) wedding dresses
-> tailored, highly customized, one-of-a-kind, or produced in very small volume
Which of these priority rules tends to reduce both work-in-process inventory, the average job completion (flow) time, and average job lateness?
a) Random
b) Critical Ratio
c) FCFS
d) Shortest Processing Time
d) Shortest Processing Time
In line balancing, different priority rules can be used to select the next task. Which of the following correctly describes the ranked positional weight rule?
a) Choose the task with the largest processing time.
b) Choose the task with the smallest processing time.
c) Choose the task with the largest number of following tasks.
d) Choose the task for which the sum of its processing time and all the processing times of its direct and indirect following tasks is the longest.
d)
Which of the following is NOT typically included in the real-world extensions to the Simple Assembly Line Balancing Problem (SALBP)?
a) Ergonomic constraints
b) Ignoring precedence constraints among tasks
c) Zoning constraints for specific operations
d) Multi-operator workstations and tasks
b) Ignoring precedence constraints : these remain essential; the others are crucial real-world extensions
What is a dominant product flow?
In a line layout, when (almost) all the items produced follow through the workstations according to the same sequence, i.e. the routes that the items follow through production are (almost) the same.
How do we compute slack time?
Slack Time = Time until job is due ā Total shop time remaining
Give the formula of idle time and efficiency.
Idle time:
number of workstations x cycle time - sum of tasks time
Efficiency:
sum of tasks time / number of workstations x cycle time
Why is the classic Simple Assembly Line Balancing Problem (SALBP) often insufficient for industries such as automotive, and what additional constraints must be considered in practice?
Because SALBP oversimplifies reality, focusing only on precedence and cycle time or workstation count. Real-world industries face many additional constraints, such as workstation identities, zoning limits, ergonomic restrictions, multi-operator stations, drifting operations, and the need to handle multiple product variants.