Therbligs
A) were invented by Frederick W. Taylor
B) were used during the scientific management era, and are no longer in use
C) are hyperactive rodent-like pets, whose name is associated with time standards
D) were named by Frank Gilbreth
E) none of the above
There are three equally likely states of nature (High, Medium, and Low demand). If the
large factory will post profits of $50,000, $25,000, and – $10,000 under these states of
nature, respectively, what is the EMV of the factory?
A) $50,000
B) $25,000
C) $28,333.33
D) $21,666.67
E) none of the above
The fundamental premise underlying learning curve analysis is that
A) tasks can be easily learned in organizations
B) organizations and people become better at their tasks as the tasks are repeated
C) learning takes place when people in organizations change
D) total labor costs decrease as the number of production units increases
E) doubling output cuts labor requirements per unit in half
A transportation problem has improvement indices of 5, 4, 0, and -3. Which of the
following is always true?
A) The transportation model is at its ideal solution.
B) The transportation model is at a feasible solution.
C) The total cost saved by changing one unit on the route with an improvement index of
5 would be $5.
D) The transportation matrix has four empty squares.
E) Both B and D
A manufacturing work cell has a takt time of 7 minutes and is staffed by 10 workers. If
the work cell delivers 68 units each day find
A. The total operation time
B. The amount of time worked during the day for all 10 workers combined
C. If the plant is open for only 8 hours per day, can the staff meet demand?
( 14x + 6y =< 42 (2) x – y =< 3 (3) x, y >= 0
A) x = 2, y = 1
B) x = 1, y = 5
C) x = -1, y = 1
D) x = 4, y = 4
E) x = 2, y = 8
Which of the following smoothing constants would make an exponential smoothing
forecast equivalent to a naive forecast?
A) 0
B) 1 divided by the number of periods
C) 0.5
D) 1.0
E) cannot be determined
Process X has fixed costs of $10,000 and variable costs of $2.40 per unit. Process Y has
fixed costs of $9,000 and variable costs of $2.25 per unit. Which of the following
statements is true?
A) The crossover point is approximately 6667 units.
B) It is impossible for one process to have both of its costs lower than those of another
process.
C) Process Y is cheaper than process X at all volumes; there is no crossover point.
D) Process X should be selected for very large production volumes.
E) Process X is more profitable than process Y and should be selected.
Students arrive randomly at the help desk of the computer lab. There is only one service
agent, and the time required for inquiry varies from student to student. Arrival rates
have been found to follow the Poisson distribution, and the service times follow the
negative exponential distribution. The average arrival rate is 12 students per hour, and
the average service rate is 20 students per hour. What is the average service time for this
problem?
A) 1 minute
B) 2 minutes
C) 3 minutes
D) 5 minutes
E) 20 minutes
Which of the following nets the largest productivity improvement?
A) increase output 15%
B) decrease input 15%
C) increase both output and input by 5%
D) increase output 10%, decrease input 3%
E) decrease input 10%, increase output 3%
The __________ is the input to material requirements planning which lists the
assemblies, subassemblies, parts, and raw materials needed to produce one unit of
finished product.
A) bill of material
B) master production schedule
C) inventory records
D) assembly time chart
E) net requirements chart
The process time of a system is equivalent to the
A) process time of the bottleneck
B) sum of all workstation times
C) shortest workstation time
D) mean workstation time
E) median workstation time
Decision trees
A) give more accurate solutions than decision tables
B) give less accurate solutions than decision tables
C) are especially powerful when a sequence of decisions must be made
D) are rarely used because one needs specialized software to graph them
E) are too complex to be used by decision makers
Companies with the highest levels of quality are almost how many times more
productive than their competitors with the lowest quality levels?
A) 2
B) 3
C) 4
D) 5
E) None of the above, quality has no impact on productivity (units/labor hr.).
Three jobs are to be assigned to three machines. Cost for each job-machine combination
appears in the table below. Perform the first two steps of the assignment method
(subtract the smallest number in each row and subtract the smallest number in each
column; then cover with straight lines). At this point in the problem-solving process
A) the row for Job 1 contains the values 5, 6, and 0
B) calculations are complete, and the problem is ready for an optimal set of assignments
C) the column for Machine B indicates that it should be retired
D) Job 1 should be performed on Machine B
E) Job 1 should be performed on Machine A
Firms making many different final products use __________ to facilitate production
scheduling.
A) planning bills
B) modular bills
C) phantom bills
D) overdue bills
E) none of the above
A system using an automated work cell controlled by electronic signals from a common
centralized computer facility is called a(n)
A) adaptive control system
B) robotics
C) flexible manufacturing system
D) automatic guided vehicle (AGV) system
E) manufacturing cell
A consultant has been brought in to a manufacturing plant to help apply six sigma
principles. Her first task is to work on the production of rubber balls. The upper and
lower spec limits are 21 and 19 cm respectively. The consultant takes ten samples of
size five and computes the sample standard deviation to be .7 cm and the sample mean
to be 19.89 cm. Compute C and Cpk for the process. Give the consultant advice on what
to do with the process based on your findings.
Labor cost for set-up is $500/hour. If the plant plans on level material use and operates
50 days per year, determine the time it takes to setup.
Explain what is meant by the concept of “time compression” in simulation modeling.
Complete the table, find average lateness, find average completion time, and average
number of jobs in the system. Assume all durations are in days and that the jobs are
processed at the shop in the order that they arrive (A then B then C then D).
A linear programming problem contains a restriction that reads “the quantity of S must
be no more than one-fourth as large as T and U combined.” Formulate this as a
constraint ready for use in problem solving software.
A special form of time-function mapping, which goes beyond the organization into its
supply chain, is __________.