A dependent demand item is so called because its demand is dependent on customer
preferences.
The MTBF (mean time between failures) is calculated as the reciprocal of the number
of failures during a period of time.
One reason to study operations management is to learn how people organize themselves
for productive enterprise.
Computer-aided design (CAD) refers to the use of specialized computer programs to
direct and control manufacturing equipment.
When identifying the optimal maintenance policy, the cost of inventory maintained to
compensate for the downtime is a cost often ignored.
The Central Limit Theorem states that when the sample size increases, the distribution
of the sample means will approach the normal distribution.
A purchasing firm should not include its home country when conducting a country risk
assessment.
Virtual reality technology can improve designs less expensively than the use of physical
models or prototypes.
Five welding jobs are waiting to be processed. Their processing times and due dates are
given below. Using the critical ratio dispatching rule, in which order should the jobs be
processed? All dates are specified as days from Today.
A) B, D, A, E, C
B) C, D, A, B, E
C) C, E, A, D, B
D) E, B, A, D, C
E) none of the above
Which of the international operations strategies involves a focus on low cost reductions
and high local responsiveness?
A) international strategy
B) global strategy
C) transnational strategy
D) multidomestic strategy
E) none of the above
An activity on a PERT network has these time estimates: optimistic = 1, most likely =
2, and pessimistic = 5. Its expected time is
A) 2.00
B) 2.33
C) 2.67
D) 8.00
E) none of these
The basic break-even model can be modified to handle more than one product. This
extension of the basic model requires
A) price and sales volume for each product
B) price and variable cost for each product, and the percent of sales that each product
represents
C) that the firm have very low fixed costs
D) that the ratio of variable cost to price be the same for all products
E) sales volume for each product
In the Learning-Curve Coefficients table for 70 percent learning, the sixth unit has a
unit time value of 0.398. Verify that table entry by use of the logarithmic formula. Use
five decimals in your work.
Hemo-tech, Inc., a biomedical technology and research laboratory, produces a standard
blood filtering device on an assembly line basis. Six basic tasks are performed along an
assembly line. The time to perform each task and the tasks that must immediately
precede each task are in the table below. Twenty pumps per 450-minute day must be
produced by the assembly line.
a. Draw the network diagram of the precedence relationships.
b. Identify the absolute minimum and maximum cycle times.
c. How many workstations are required to meet the schedule?
d. What is the cycle time required to meet demand?
e. Balance this line using most following tasks heuristic.
f. What is the efficiency of the line obtained in part e?
g. Can the efficiency of this solution be improved? Explain.
Demand for a certain product is forecast to be 800 units per month, averaged over all 12
months of the year. The product follows a seasonal pattern, for which the January
monthly index is 1.25. What is the seasonally-adjusted sales forecast for January?
A) 640 units
B) 798.75 units
C) 801.25 units
D) 1000 units
E) 88.33 units
The use of information technology to monitor and control a physical process is known
as
A) process control
B) computer-aided design
C) information numeric control
D) numeric control
E) none of the above
The Dulac Box plant works two 8-hour shifts each day. In the past, 500 cypress packing
boxes were produced by the end of each day. The use of new technology has enabled
them to increase productivity by 30%. Productivity is now approximately
A) 32.5 boxes/hr
B) 40.6 boxes/hr
C) 62.5 boxes/hr
D) 81.25 boxes/hr
E) 300 boxes/hr
A crew of mechanics at the Highway Department garage repair vehicles that break
down at an average of = 7.5 vehicles per day (approximately Poisson in nature). The
mechanic crew can service an average of = 10 vehicles per day with a repair time
distribution that approximates an exponential distribution.
a. What is the utilization rate for this service system?
b. What is the average time before the facility can return a breakdown to service?
c. How much of that time is spent waiting for service?
d. How many vehicles are likely to be in the system at any one time?
A master production schedule contains information about
A) quantities and required delivery dates of all subassemblies
B) quantities and required delivery dates of final products
C) inventory on hand for each subassembly
D) inventory on hand for each final product
E) scheduled receipts for each final product
Which of the following is not an advantage of work cells?
A) reduced direct labor cost
B) decreased use of equipment and machinery
C) heightened sense of employee participation
D) reduced raw material and finished goods inventory
E) reduced investment in machinery and equipment
Political risk, cultural issues, and exchange rates are among those __________ that
affect which country will be selected for a location decision.
A stereo mail order center has 8,000 cubic feet available for storage of its private label
loudspeakers. The ZAR-3 speakers cost $295 each and require 4 cubic feet of space; the
ZAR-2ax speakers cost $110 each and require 3 cubic feet of space; and the ZAR-4
model costs $58 and requires 1 cubic foot of space. The demand for the ZAR-3 is at
most 20 units per month. The wholesaler has $100,000 to spend on loudspeakers this
month. Each ZAR-3 contributes $105, each ZAR-2ax contributes $50, and each ZAR-4
contributes $28. The objective is to maximize total contribution. Write out the objective
and the constraints.
__________ uses computerized short-term scheduling to overcome the disadvantages of
rule-based systems by providing the user with interactive computing and graphical
output.
Identify the layout tactics appropriate for a JIT environment.
Describe the theory of constraints in a sentence.
The Queen City Nursery manufactures bags of potting soil from compost and topsoil.
Each cubic foot of compost costs 12 cents and contains 4 pounds of sand, 3 pounds of
clay, and 5 pounds of humus. Each cubic foot of topsoil costs 20 cents and contains 3
pounds of sand, 6 pounds of clay, and 12 pounds of humus. Each bag of potting soil
must contain at least 12 pounds of sand, 12 pounds of clay, and 10 pounds of humus.
Explain how this problem meets the conditions of a linear programming problem. Plot
the constraints and identify the feasible region. Graphically or with corner points find
the best combination of compost and topsoil that meets the stated conditions at the
lowest cost per bag. Identify the lowest cost possible.
