POM Exam #2 (Ch. 6,7,9)

For an infinite queuing situation, if the arrival rate for loading trucks is 5 trucks per hour, what is the mean time between arrivals?

.2 hours mean time between arrivals=1/arrival rate= 1/5= .2 hours

Using the assembly-line balancing procedure, which of the following is the required cycle time if the production time in minutes per day is 1440 and the required output per day in units is 2000?

.72 1440 minutes/2000 units= .72 per unit

You have just determined the actual number of workstations that will be used on an assembly line to be 6 using the assembly-line balancing procedure. The cycle time of the line is 5 minutes and the sum of all that tasks required on the line is 25 minutes. Which of the following is the correct value for the resulting line's efficiency?

.833 25/(6*5)

There are several ways that we may be able to accommodate a 40-second task in a 36-second cycle. Possibilities are:

1. Split the task. 2. Share the task 3. Use parallel workstations. 4. Use a more skilled worker. 5. Work overtime. 6. Redesign. Other possibilities to reduce the task time include an equipment upgrade, a roaming helper to support the line, a change of materials, and multiskilled workers to operate the line as a team rather than as independent workers.

Using the assembly-line balancing procedure, which of the following is the required cycle time in minutes per unit if the daily production time is 480 minutes and the required daily output is 50 units?

9.6

an assembly line is..

An assembly line is where work processes are arranged according to the progressive steps by which the product is made.

what are queue disciplines discussed in textbook

Probably the most common priority rule is first come, first served. Reservations first, emergencies first, highest-profit customer first, largest orders first, best customers first, longest waiting time in line, and soonest promised date are other examples of priority rules.

MRP systems seek to achieve which of the following?

Determine the number of dependent demand items needed

One of the main purposes of a MRP system is which of the following?

Develop schedules specifying when each component should be ordered or produced.

In the service-system design matrix, a face-to-face total customization service encounter is expected to have which of the following?

Low production efficiency

Buying a ticket for a college football game where there are multiple windows to buy the ticket at features which type of queuing system line structure?

Multichannel, single phase

Which of the following is a characteristic that can be used to guide the design of service systems?

Services cannot be inventoried

Little's Law

Simple systems can be analyzed quickly using a principle known as Little's law. Little's law says there is a long-term relationship between the inventory, throughput, and flow time of a production system in steady state. The relationship is: Inventory = Throughput rate × Flow time.

what are the 5 basic structures of facility arrangement

The formats by which a facility is arranged are defined by the general pattern of work flow; there are five basic structures (project, workcenter, manufacturing cell, assembly line, and continuous process).

what are the 3 T's?

These can be classified into warning methods, physical or visual contact methods, and by what we call the Three T's —the -Task to be done (Was the car fixed right?), -the Treatment accorded to the customer (Was the service manager courteous?), -and the Tangible or environmental features of the service facility (Was the waiting area clean and comfortable?).

According to Little's Law, which of the following can be used to estimate work-in-process inventory?

Throughput rate times Flow time

Which of the following is an input to the master production schedule (MPS)?

aggregate plan

Which of the following basic types of process structures is one which equipment or work processes are arranged according to the progressive steps by which the product is made?

assembly line

The placement of which of the following is not determined by production process organization decisions?

emergency exits

Which of the following is not considered a major work flow structure?

fabrication

Which of the following is an input file necessary to run an MRP system?

inventory records file

Which of the following is not a queue discipline discussed in the textbook?

last in, first out

Standing in line to buy a ticket for a movie where there are multiple windows to buy tickets is which type of queuing system line structure?

multichannel, single phase Multichannel, single phase. Tellers' windows in a bank and checkout counters in high-volume department stores exemplify this type of structure.

Which of the following is an input to the master production schedule?

none, POS goes into inventory records file which goes to MRP

Which of the following is a suggestion for managing queues presented in the textbook?

options could be: segment the customer train your servers to be friendly

Which of the following is considered a primary report in an MRP system?

planned order schedule

Which of the following is considered a primary report in an MRP system?

planned order schedules

We would expect to see which of the following in an MRP system's inventory status file?

scrap parts

When balancing an assembly line, which of the following is not a way to reduce the longest task time below the required workstation cycle time?

speed up the assembly line transfer mechanism

There are many applications of poka-yokes in service organizations. Which of the following is one of the three-T's used to classify poka-yokes?

task

In an MRP program, the program accesses the status segment of an inventory record according to specific periods called which of the following?

time buckets

Using the assembly-line balancing procedure, which of the following is the theoretical minimum number of workstations if the task times for the six tasks that make up the job are 4, 6, 7, 2, 6, and 5 minutes, and the cycle time is 10 minutes?

total of task time/ cycle time

Which of the following is a basic type of process structure?

workcenter

Useful suggestions for managing queues are the following:

• Segment the customers. • Train your servers to be friendly. • Inform your customers of what to expect. • Try to divert the customer's attention when waiting. • Encourage customers to come during slack periods.