Deck 14: Extension: Maintenance

Question 1

One basis for scheduling preventive maintenance is passage of time.

Answer 1

True

Question 2

Breakdown maintenance is best performed on a regularly scheduled basis.

Answer 2

False

Question 3

Pareto analysis (using the 80/20 rule) is one method of determining when preventive maintenance activities should be performed.

Answer 3

False

Question 4

Suppose that for a particular piece of machinery, the frequency distribution of monthly breakdowns is as follows: $$\begin{array} { c c } \text { Number of Breakdowns } & \text { Prob. } \\\hline 0 & 0.40 \\1 & 0.30 \\2 & 0.15 \\3 & 0.10 \\4 & 0.05\end{array}$$ The cost of a breakdown is $2,000, and the cost of a preventive maintenance program is $2,000 per month. If the preventive maintenance program is adopted, the probability of a machine breakdown is negligible. How much better off per month would the firm be if it adopted preventive maintenance?

A) $100 worse off
B) $200 worse off
C) $100 better off
D) $200 better off
E) $2,000 better off

Question 5

Suppose that for a particular piece of machinery, the frequency distribution of monthly breakdowns is as follows: $$\begin{array} { c l } \text { Number of Breakdowns } & \text { Prob. } \\\hline 0 & 0.50 \\1 & 0.25 \\2 & 0.10 \\3 & 0.10 \\4 & 0.05\end{array}$$ The cost of a breakdown is $2,000, and the cost of a preventive maintenance program is $2,000 per month. If the preventive maintenance program is adopted, the probability of a machine breakdown is negligible. How much better off per month would the firm be if it adopted preventive maintenance?

A) $100 worse off
B) $200 worse off
C) $100 better off
D) $200 better off
E) $2,000 better off

Question 6

The goal of maintenance is to maintain the productive system in good working order while minimizing or eliminating the cost of preventive maintenance.

Question 7

Cost of equipment breakdown does not include:

A) loss of output.
B) cost of idle workers.
C) damage to other equipment.
D) replacement costs.
E) potential safety hazard.

Question 8

In the area of maintenance, the Pareto phenomenon is reflected in the fact that, regardless of problem classification, all equipment will justify about the same expense.

Question 9

The goal of maintenance is to minimize cost.

Question 10

In the broadest sense, preventive maintenance extends back to the installation stage of equipment and facilities.

Question 11

Degree of technology is a factor affecting the decision of how much preventive maintenance is desirable.

Question 12

Breakdown maintenance includes activities such as equipment inspection and adjustment.

Question 13

The goal of maintenance is to maintain the productive system in good working order while minimizing:

A) total preventive maintenance costs.
B) total breakdown maintenance costs.
C) total maintenance costs.
D) the difference between preventive and breakdown costs.
E) the ratio of breakdown to preventive maintenance costs.

Question 14

Breakdown maintenance is _____________; preventive maintenance is _________.

A) reactive; proactive
B) proactive; reactive
C) expensive; inexpensive
D) inexpensive; expensive
E) easy; hard

Question 15

As a piece of equipment begins to break down more often, the manager is often faced with a trade-off in which __________ are weighed against the __________.

A) failure rates; maintenance probabilities
B) maintenance intervals; maintenance programs
C) operating costs; variable costs
D) replacement costs; continued maintenance costs
E) fixed costs; maintenance costs

Question 16

Suppose that the average time before breakdown is normally distributed with a mean of 2.5 weeks and a standard deviation of .4 weeks. If breakdowns cost an average of $1,200 and preventive maintenance costs $800, what is the optimal maintenance interval?

A) Every .67 weeks
B) Every .33 weeks
C) Every 2.67 weeks
D) Every 3.25 weeks
E) Every 3.12 weeks

Question 17

Factors affecting the decision of how much preventive maintenance is desirable typically include all of the following except:

A) age of equipment.
B) type of product.
C) degree of technology.
D) type of production process.
E) how critical to the production process.

Question 18

___________ is most closely associated with breakdown maintenance.

A) Equipment adjustment
B) Equipment cleaning
C) Equipment inspection
D) Repair of broken parts
E) Replacement of worn parts

Question 19

Ideally, preventive maintenance will be performed before a breakdown or failure.

Question 20

Maintenance activities are often organized into the following two groups:

A) breakdown maintenance and preventive maintenance
B) breakdown maintenance and predictive maintenance
C) preventive maintenance and predictive maintenance
D) equipment maintenance and breakdown maintenance
E) equipment maintenance and buildings maintenance

Question 21

The average time before breakdown of a machine is normally distributed and has a mean of seven weeks and a standard deviation of 1.5 weeks. If breakdown cost averages $2,500 and preventive maintenance costs $500, what is the optimal preventive maintenance interval?

Question 22

Reactive maintenance is _____________ maintenance.

A) planned
B) after the event
C) proactive
D) predictive
E) preventive

Question 23

Preventive maintenance is generally scheduled on the basis of:

A) planned inspections.
B) passage of time.
C) number of operating hours.
D) all of the choices.
E) none of the choices.

Question 24

Breakdown programs often are prioritized such that some equipment gets a lot of attention and other equipment gets very little. This typically reflects the fact that breakdowns are consistent with:

A) Pareto phenomena.
B) production interruptions.
C) supply disturbances.
D) cross-trained workers.
E) lean operations.

Question 25

Attempting to determine when preventive maintenance activities should be performed is called:

A) breakdown maintenance.
B) forecastive maintenance.
C) preventive maintenance.
D) predictive maintenance.
E) corrective maintenance.

Question 26

The total maintenance curve (preventive maintenance cost plus breakdown and repair cost):

A) slopes up as the number of preventive maintenances increases.
B) slopes down as the number of preventive maintenances increases.
C) starts low, increases rapidly, and then drops back down as the number of preventive maintenances increases.
D) starts high, drops gradually, but then goes back up as the number of preventive maintenances increases.
E) remains relatively flat as the number of preventive maintenances increases.

Question 27

Ideally, preventive maintenance will be performed:

A) after a planned inspection.
B) after the passage of a specified period of time.
C) after a predetermined number of operating hours.
D) just prior to the start of the workday.
E) just prior to a breakdown or failure.

Question 28

The type of maintenance which is periodic in nature is:

A) breakdown maintenance.
B) predictive maintenance.
C) preventive maintenance.
D) corrective maintenance.
E) all of the choices.

Question 29

"Total productive maintenance" is best described as:

A) avoiding all breakdown maintenance.
B) doing a great deal of preventive maintenance to try to avoid breakdown maintenance.
C) a JIT approach that takes advantage of cross-training.
D) extending preventive maintenance back to design.
E) none of these.

Question 30

In the broadest sense, equipment and facilities preventive maintenance extends back to the:

A) design and selection stage.
B) procurement stage.
C) installation stage.
D) pilot-testing stage.
E) implementation stage.

Question 31

The frequency of breakdown of a piece of equipment per month is shown in the following table. The cost of a breakdown is $1,000, and the cost of preventive maintenance is $2,000 per month. Assume that the equipment breakdown can be avoided if preventive maintenance is performed. Should the manager use preventive maintenance, or would it be better to fix the equipment when it breaks down?

[COMP: Delete zeros before decimals in table.]

Question 32

Which of the following is the primary consideration with regard to preventive maintenance?

A) what technology to use
B) how varied the maintenance will be
C) how often the maintenance will occur
D) which products it will be provided to
E) who will do it

Question 33

The average time before breakdown of a machine is normally distributed and has a mean of 18 weeks and a standard deviation of three weeks. If breakdown cost averages $2,000 and preventive maintenance costs $1,400, what is the optimal preventive maintenance interval?

A) 16.4 weeks
B) 14.6 weeks
C) 16.9 weeks
D) 19.6 weeks
E) 21.3 weeks

Question 34

In the area of maintenance, the Pareto phenomenon is reflected in the fact that:

A) all equipment justifies about the same expense.
B) a majority of equipment will justify considerable expense.
C) a few pieces of equipment will justify little expense.
D) a few pieces of equipment will justify considerable expense.
E) no piece of equipment will justify major expense; it's better to replace.

Question 35

The optimum amount of preventive maintenance occurs when:

A) total breakdown costs are at a minimum.
B) total preventive maintenance costs are at a minimum.
C) each maintenance component cost is at a minimum.
D) total maintenance costs are at a maximum.
E) total maintenance costs are at a minimum.

Question 36

The major approaches used in plans to deal with breakdowns include all of the following except:

A) standby equipment.
B) inventories of spare parts.
C) operator repair of minor problems.
D) readily available repair personnel.
E) All are major approaches.

Question 37

The average time before breakdown of a machine is normally distributed and has a mean of nine weeks and a standard deviation of 1.5 weeks. If breakdown cost averages $1,500 and preventive maintenance costs $500, what is the optimal preventive maintenance interval?

A) 3.8 weeks
B) 8.4 weeks
C) 9.6 weeks
D) 6.9 weeks
E) 7.2 weeks

Question 38

Which of the following would not improve the performance of a breakdown program?

A) more trained personnel
B) short lead times for replacement parts
C) standby equipment
D) cross-training repair personnel
E) reducing inventories of spare parts