Question 1

Which one of the following statements about maintenance is true?

Accepted Answer

A)  The optimal degree of preventive maintenance is associated with zero breakdowns. 
B)  Breakdown maintenance is proactive. 
C)  Preventive maintenance is reactive. 
D)  Preventive maintenance is limited to keeping machinery and equipment running. 
E)  Human resources are a major component of effective maintenance management. 
A)  The optimal degree of preventive maintenance is associated with zero breakdowns. 
B)  Breakdown maintenance is proactive. 
C)  Preventive maintenance is reactive. 
D)  Preventive maintenance is limited to keeping machinery and equipment running. 
E)  Human resources are a major component of effective maintenance management. E

Question 2

Explain carefully how redundancy improves product reliability.

Accepted Answer

A redundant part or component is connected in parallel with the primary part or component. "In parallel" means that either the original part or its backup needs to work, not that both must work at the same time. Redundancy increases reliability by providing an additional path (through the redundant part) to provide system reliability.

Question 3

__________ is a plan that involves routine inspections, servicing, and keeping facilities in good repair to prevent failure.

Accepted Answer

Preventive maintenance

Question 4

MTBF measures the average

Accepted Answer

A)  calendar time between failures 
B)  operating time between failures 
C)  number of failures per unit time 
D)  number of operations between failures 
E)  downtime per breakdown 
A)  calendar time between failures 
B)  operating time between failures 
C)  number of failures per unit time 
D)  number of operations between failures 
E)  downtime per breakdown

Question 5

Which of the following increase as repairs move from the maintenance department to the depot service?

Accepted Answer

A)  cost 
B)  replacement time 
C)  quality 
D)  employee ownership 
E)  A, B, and C 
A)  cost 
B)  replacement time 
C)  quality 
D)  employee ownership 
E)  A, B, and C

Question 6

Consider a product that is "settled in." Its MTBF distribution has been found to be normal with a mean of 1,000 hours and a standard deviation of 250 hours. What is the probability of a breakdown before 750 hours? Before 500 hours? Would you prefer a policy of preventive maintenance, or a policy of breakdown maintenance, on this product? Explain your choice.

Accepted Answer

Failure probabilities are not negligible

Question 7

The objective of maintenance and reliability is to

Accepted Answer

A)  ensure that breakdowns do not affect the quality of the products 
B)  ensure that no breakdowns will ever occur 
C)  ensure that preventive maintenance costs are kept as low as possible 
D)  maintain the capability of the system 
E)  ensure that maintenance employees are fully utilized 
A)  ensure that breakdowns do not affect the quality of the products 
B)  ensure that no breakdowns will ever occur 
C)  ensure that preventive maintenance costs are kept as low as possible 
D)  maintain the capability of the system 
E)  ensure that maintenance employees are fully utilized

Question 8

__________ consists of all activities involved in keeping a system's equipment in working order.

Accepted Answer

The answer of __________ consists of all activities involved in...

Question 9

While breakdowns occur randomly, their frequency is somewhat predictable through such tools as the product failure rate, MTBF, and the breakdown costs model.

Accepted Answer

A) True 
 B)False

Question 10

Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.

Accepted Answer

A) True 
 B)False

Question 11

Why is it that many cases of infant mortality of products are not due to product failure?

Accepted Answer

In many cases the failure is not of the

Question 12

The "full cost view of maintenance" results in more firms choosing a policy of breakdown maintenance, when compared to the "traditional view of maintenance."

Accepted Answer

A) True 
 B)False

Question 13

How is MTBF related to FR(N)?

Accepted Answer

A)  MTBF is measured in hours, while FR(N) is measured in years. 
B)  MTBF is normally distributed, with FR(%) as its mean and FR(N) as its standard deviation. 
C)  MTBF is the reciprocal of FR(N). 
D)  Both MTBF and FR(N) increase when breakdown maintenance is replaced by preventive maintenance. 
E)  MTBF and FR(N) are unrelated concepts. 
A)  MTBF is measured in hours, while FR(N) is measured in years. 
B)  MTBF is normally distributed, with FR(%) as its mean and FR(N) as its standard deviation. 
C)  MTBF is the reciprocal of FR(N). 
D)  Both MTBF and FR(N) increase when breakdown maintenance is replaced by preventive maintenance. 
E)  MTBF and FR(N) are unrelated concepts.

Question 14

The MTBF (mean time between failures) is calculated as the reciprocal of the number of failures during a period of time.

Accepted Answer

A) True 
 B)False

Question 15

A system is composed of four parts, J, K, L, and M. All four must function for the system to function. The four component reliabilities are .99, .98, .992, and .998. The designers are considering putting a .80 reliable backup at K. This backup will change the system reliability from __________ to __________.

Accepted Answer

A)  0.9762 to 0.9605 
B)  0.9605 to 0.9762 
C)  0.9605 to some smaller value 
D)  cannot be determined 
E)  none of the above 
A)  0.9762 to 0.9605 
B)  0.9605 to 0.9762 
C)  0.9605 to some smaller value 
D)  cannot be determined 
E)  none of the above

Question 16

Which one of the following is not necessary to identify the optimal maintenance policy?

Accepted Answer

A)  historical data on maintenance costs 
B)  cost of performing the analysis 
C)  breakdown probabilities 
D)  breakdown occurrences 
E)  repair times 
A)  historical data on maintenance costs 
B)  cost of performing the analysis 
C)  breakdown probabilities 
D)  breakdown occurrences 
E)  repair times

Question 17

Suppose that a car mechanic offers you a deal that for the next 3 years any breakdowns will be covered, so long as you bring your car in for $50 preventative maintenance sessions each month. If you predict the likelihood of a breakdown being 25% without the maintenance, how much must a breakdown cost for you to prefer the preventative maintenance?

Accepted Answer

36 months * $50/mont

Question 18

Components A, B, and C are connected in series. Component D is connected in parallel to component B. Which of the following statements is true?

Accepted Answer

A)  The system works only if A works, B or C works, and D works. 
B)  Component B must work for the system to work. 
C)  The system works when A works, C, works, and either B or D works. 
D)  Components B and C are backups to A. 
E)  The system works if D works, and any of A, B, or C works. 
A)  The system works only if A works, B or C works, and D works. 
B)  Component B must work for the system to work. 
C)  The system works when A works, C, works, and either B or D works. 
D)  Components B and C are backups to A. 
E)  The system works if D works, and any of A, B, or C works.

Question 19

Increasing the number of parts or components in a product tends to reduce its reliability. Why is this true only when adding components in series?

Accepted Answer

Adding parts in series involves an addit

Question 20

Simulation models and expert systems are useful tools for enhancing maintenance.

Accepted Answer

A) True 
 B)False

Exam 17: Maintenance and Reliability

Which one of the following statements about maintenance is true?

Explain carefully how redundancy improves product reliability.

__________ is a plan that involves routine inspections, servicing, and keeping facilities in good repair to prevent failure.

MTBF measures the average

Which of the following increase as repairs move from the maintenance department to the depot service?

The objective of maintenance and reliability is to

__________ consists of all activities involved in keeping a system's equipment in working order.

While breakdowns occur randomly, their frequency is somewhat predictable through such tools as the product failure rate, MTBF, and the breakdown costs model.

Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.

Why is it that many cases of infant mortality of products are not due to product failure?

The "full cost view of maintenance" results in more firms choosing a policy of breakdown maintenance, when compared to the "traditional view of maintenance."

How is MTBF related to FR(N)?

The MTBF (mean time between failures) is calculated as the reciprocal of the number of failures during a period of time.

Which one of the following is not necessary to identify the optimal maintenance policy?

Components A, B, and C are connected in series. Component D is connected in parallel to component B. Which of the following statements is true?

Increasing the number of parts or components in a product tends to reduce its reliability. Why is this true only when adding components in series?

Simulation models and expert systems are useful tools for enhancing maintenance.

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