Reliability is the probability that a machine part or product will function properly for a
specified time regardless of conditions.
If setup times and costs can be reduced enough, the JIT ideal of “Lot Size = 1” can be
achieved.
One criterion for developing effective schedules is minimizing completion time.
The MTBF distributions of products, machines, or processes that have €settled in,€ or
gone beyond the infant mortality phase, often follow the normal distribution.
Technology, location, and layout decisions are all possible constraints on the human
resource strategy.
Four of the most widely used waiting line models€M/M/1 or A, M/M/S or B, M/D/1 or
C, and Limited population or D€all share three characteristics: Poisson arrivals, FIFO
discipline, and exponential service times.
The constant work-in-process (ConWIP) card aids input-output control by limiting the
amount of work in a work center.
The critical ratio sequencing rule prioritizes the jobs based on the importance or value
of the customers who have placed the orders.
Which of the following is true regarding the concept of flexibility?
A) It is the ability to change production rates with little penalty in time, cost, or
customer value.
B) It can be accomplished with sophisticated electronic equipment.
C) It may involve modular, movable, even cheap equipment.
D) All of the above are true.
E) None of the above is true.
Which of the following is not a strategy for improving service productivity?
A) self-service
B) automation
C) scheduling
D) separation
E) mass customization
A tabular presentation that shows the outcome for each decision alternative under the
various possible states of nature is called a(n)
A) isoquant table
B) payback period matrix
C) payoff table
D) feasible region
E) decision tree
Manufacturing cycle time is best defined as the
A) length of the work shift, expressed in minutes per day
B) time it takes a unit to move from one workstation to the next
C) time between the start of one unit and the start of the next unit
D) sum of all the task times to make one unit of a product
E) time from raw materials receipt to finished product exit
Which of the following is a similarity between goods and services?
A) mass production
B) consistency
C) automation
D) application of operations management
E) all of the above
A regional bookstore chain is about to build a distribution center that is centrally
located for its eight retail outlets. It will most likely employ which of the following
tools of analysis?
A) assembly line balancing
B) load-distance analysis
C) center-of-gravity model
D) linear programming
E) all of the above
In work measurement, personal time allowances are often established in the range of
A) 0 – 2%
B) 3 – 5%
C) 4 – 7%
D) 6 – 10%
E) 10-15%
Quality can improve profitability by reducing costs. Which of the following is not an
aspect of reduced costs by quality improvements?
A) flexible pricing
B) increased productivity
C) lower rework and scrap costs
D) lower warranty costs
E) All of the above are aspects of reduced costs by quality improvements.
When a worker obtains clear and timely information about his/her performance, his/her
job is characterized by
A) feedback
B) skill variety
C) job identity
D) job significance
E) autonomy
The minimum record accuracy required for successful MRP is approximately
A) lower than 90%
B) 90%
C) 95%
D) 97%
E) 99%
Consider the network pictured below.
a. Enumerate all paths through this network.
b. Calculate the critical path for the network.
c. What is the minimum duration of the project?
d. How much slack exists at each activity?
A job consists of a series of three tasks. Task 1 is performed correctly 98% of the time,
task 2 is performed correctly 99% of the time, and task 3 is performed correctly 97% of
the time. The reliability of this job is
A) 91.27%
B) 94.11%
C) 97.00%
D) 98.00%
E) 99.00%
Which of the following statements is true about the MRP plan when using lot-for-lot
ordering?
A) The quantity of gross requirements for a child item is always equal to the quantity of
planned order releases for its parent.
B) The quantity of gross requirements for a child item is equal to the quantity of
planned order release(s) multiplied by the number of child items used in the parent
assembly.
C) The quantity of gross requirements for a child item is always equal to the quantity of
gross requirements for its parent.
D) The quantity and gross requirements for a child item is always equal to the quantity
of net requirements for its parent.
E) All of the above are true.
The campus bookstore sells stadium blankets embroidered with the university crest. The
blankets must be purchased in bundles of one dozen each. Each blanket in the bundle
costs $65, and will sell for $90. Blankets unsold by homecoming will be clearance
priced at $20. The bookstore estimates that demand patterns will follow the table below.
a. Build the decision table.
b. What is the maximum expected value?
c. How many bundles should be purchased?
Arnold Tofu owns and operates a chain of 12 vegetable protein “hamburger” restaurants
in northern Louisiana. Sales figures and profits for the stores are in the table below.
Sales are given in millions of dollars; profits are in hundreds of thousands of dollars.
Calculate a regression line for the data. What is your forecast of profit for a store with
sales of $24 million? $30 million?
Which of the following technologies would enable a cashier to scan the entire contents
of a shopping cart in seconds?
A) ASRS
B) AGV
C) CAD/CAM
D) RFID
E) FMS
As far as maintenance costs are concerned,
A) for low levels of maintenance commitment, breakdown maintenance costs exceed
preventive maintenance costs
B) for low levels of maintenance commitment, preventive maintenance costs exceed
breakdown maintenance costs
C) for high levels of maintenance commitment, breakdown maintenance costs exceed
preventive maintenance costs
D) preventive maintenance is always more economical than breakdown maintenance
E) Breakdown maintenance is always more economical than preventive maintenance
when the €full cost of breakdowns€ is taken into consideration.
Motorola is in an industry where there are intense pressures to keep costs low. Why did
Motorola reject a possible location that offered low manufacturing costs?
A(n) __________ is a tabular means of analyzing decision alternatives and states of
nature.
What are the criteria by which we evaluate sequencing rules?
What design guidelines help retail layouts to maximize customer exposure to products?
Identify sources of variability.