Question 1

When depot service is compared to operator maintenance:

Accepted Answer

A) operator maintenance is slower than depot service. 
B) competence is higher,but costs may also be higher,with depot service. 
C) depot service is often the weak link in the chain because of the lack of specific training. 
D) depot service occurs on-site,while operator maintenance occurs off-site. 
E) depot service is better for systems connected in parallel,while operator maintenance is preferred for systems connected in series. 
A) operator maintenance is slower than depot service. 
B) competence is higher,but costs may also be higher,with depot service. 
C) depot service is often the weak link in the chain because of the lack of specific training. 
D) depot service occurs on-site,while operator maintenance occurs off-site. 
E) depot service is better for systems connected in parallel,while operator maintenance is preferred for systems connected in series.

Question 2

A two-component process has an 81% success rate in series and a 99% success rate in parallel.If each component has the same reliability,what is the reliability of an individual component?

Accepted Answer

A) 50% 
B) 90% 
C) 99% 
D) 18% 
E) 81% 
A) 50% 
B) 90% 
C) 99% 
D) 18% 
E) 81%

Question 3

Infant mortality refers to which one of the following examples?

Accepted Answer

A) high frequency on the left side of the MTBF distribution 
B) failure of items used in the nursery ward of a hospital 
C) failure of products with a very short life cycle 
D) market failure of brand new products 
E) high failure rate often encountered in the very early stages of the lifetime of a product 
A) high frequency on the left side of the MTBF distribution 
B) failure of items used in the nursery ward of a hospital 
C) failure of products with a very short life cycle 
D) market failure of brand new products 
E) high failure rate often encountered in the very early stages of the lifetime of a product

Question 4

A system consists of four components in series.The reliability of each component is 0.96.What is the reliability of the system?

Accepted Answer

The reliability of t

Question 5

Suppose that the introduction of a preventive maintenance program is deemed cost effective.Which of the following is most likely true if the cost to actually perform preventive maintenance is very expensive?

Accepted Answer

A) high standard deviation in MTBF 
B) low standard deviation in MTBF 
C) low cost to repair 
D) Repairs carry little non-monetary consequences. 
E) The system never fails. 
A) high standard deviation in MTBF 
B) low standard deviation in MTBF 
C) low cost to repair 
D) Repairs carry little non-monetary consequences. 
E) The system never fails.

Question 6

Given the following data,find the expected breakdown cost.The cost per breakdown is $200.

Accepted Answer

@#IMG-DLM& Expected number of breakdowns

Question 7

Ten high-intensity bulbs are tested for 100 hours each.One failed at 10 hours; all others completed the test.Calculate FR(%),FR(N)and MTBF.

Accepted Answer

FR(%)= 1/10 or 10%; operating

Question 8

Great Southern Consultants Group's computer system has been down several times over the past few months,as shown below.
   Each time the system is down,the firm loses an average of $400 in time and service expenses.They are considering signing a contract for preventive maintenance.With preventive maintenance,the system would be down on average only 0.5 per month.The monthly cost of preventive maintenance would be $200 a month.Which is cheaper,breakdown or preventive maintenance?

Accepted Answer

@#IMG-DLM& Expected # of breakdowns per month = (0

Question 9

A simple electrical motor has three components: windings,armature,and housing.These three components have reliabilities of .97,.992,and .999.There is no possibility of redundant parts.The motor must have an overall reliability of at least 0.980,according to the product line manager who will use the motor as an input.What would you do to redesign the motor to meet this specification? Discuss,including a recalculation to meet the standard.

Accepted Answer

Since no backup is possible,individual c

Question 10

Ten high-intensity bulbs are tested for 100 hours each.One failed at 40 hours; another failed at 70 hours; all others completed the test.Calculate FR(%),FR(N),and MTBF.

Accepted Answer

FR(%)= 2/10 or 20%;

Question 11

DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below.Each time the machine breaks down,the firm loses an average of $3,000 in time and repair expenses.   What is the expected breakdown cost per week?

Accepted Answer

A) $1,000 
B) $2,000 
C) $6,000 
D) $10,000 
E) $60,000 
A) $1,000 
B) $2,000 
C) $6,000 
D) $10,000 
E) $60,000

Question 12

Century Digital Phone advertises phone battery life (on standby)of up to three days.The standard deviation is thought to be five hours.Tina Talbot,an employee at CDP,tested 10 of these batteries for 72 hours.One failed at 40 hours; one failed at 62 hours; one failed at 70 hours.All others completed the test.Calculate FR(%),FR(N),and MTBF.

Accepted Answer

FR(%)= 3/10 or 30%.F

Question 13

DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below.Each time the machine breaks down,the firm loses an average of $3,000 in time and repair expenses.If preventive maintenance were implemented,it is estimated that an average of only one breakdown per week would occur.The cost of preventive maintenance is $1,000 per week.   What is the weekly total maintenance cost of this program?

Accepted Answer

A) $1,000 
B) $3,000 
C) $4,000 
D) $6,000 
E) $8,000 
A) $1,000 
B) $3,000 
C) $4,000 
D) $6,000 
E) $8,000

Question 14

DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below.   What is the expected number of breakdowns per week?

Accepted Answer

A) 1 
B) 2 
C) 6 
D) 10 
E) 30 
A) 1 
B) 2 
C) 6 
D) 10 
E) 30

Question 15

Techniques for improving total productive maintenance can include which of the following?

Accepted Answer

A) simulation 
B) expert systems 
C) sensors 
D) A and C 
E) A,B,and C 
A) simulation 
B) expert systems 
C) sensors 
D) A and C 
E) A,B,and C

Question 16

Autonomous maintenance occurs when:

Accepted Answer

A) employees are empowered to observe,check,adjust,clean,and notify. 
B) a remote computer system signals the need for breakdown maintenance. 
C) a remote computer system signals the need for preventative maintenance. 
D) employees perform their own breakdown maintenance. 
E) none of the above 
A) employees are empowered to observe,check,adjust,clean,and notify. 
B) a remote computer system signals the need for breakdown maintenance. 
C) a remote computer system signals the need for preventative maintenance. 
D) employees perform their own breakdown maintenance. 
E) none of the above

Question 17

The normal distribution is an appropriate model of:

Accepted Answer

A) the high initial failure rates of product,machine,or processes. 
B) system reliability where components are connected in series. 
C) system reliability where components are connected in parallel. 
D) the MTBF distribution of products,machines,or processes that have "settled in." 
E) the full cost view of maintenance. 
A) the high initial failure rates of product,machine,or processes. 
B) system reliability where components are connected in series. 
C) system reliability where components are connected in parallel. 
D) the MTBF distribution of products,machines,or processes that have "settled in." 
E) the full cost view of maintenance.

Question 18

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 19

Preventive maintenance is reactive.

Accepted Answer

A) True 
 B)False

Question 20

Maintenance includes all activities involved in keeping a system's equipment in working order.

Accepted Answer

A) True 
 B)False

Exam 18: Maintenance and Reliability

When depot service is compared to operator maintenance:

A two-component process has an 81% success rate in series and a 99% success rate in parallel.If each component has the same reliability,what is the reliability of an individual component?

Infant mortality refers to which one of the following examples?

A system consists of four components in series.The reliability of each component is 0.96.What is the reliability of the system?

Suppose that the introduction of a preventive maintenance program is deemed cost effective.Which of the following is most likely true if the cost to actually perform preventive maintenance is very expensive?

Given the following data,find the expected breakdown cost.The cost per breakdown is $200.

Ten high-intensity bulbs are tested for 100 hours each.One failed at 10 hours; all others completed the test.Calculate FR(%),FR(N)and MTBF.

Ten high-intensity bulbs are tested for 100 hours each.One failed at 40 hours; another failed at 70 hours; all others completed the test.Calculate FR(%),FR(N),and MTBF.

DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below. What is the expected number of breakdowns per week?

Techniques for improving total productive maintenance can include which of the following?

Autonomous maintenance occurs when:

The normal distribution is an appropriate model of:

The objective of maintenance and reliability is to:

Preventive maintenance is reactive.

Maintenance includes all activities involved in keeping a system's equipment in working order.

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