Question 1

When identifying the optimal maintenance policy,the cost of inventory maintained to compensate for the downtime is a cost often ignored.

Accepted Answer

A) True 
 B)False

Question 2

A system has three components in parallel with reliabilities 0.9,0.7,and 0.5.What is the system reliability?

Accepted Answer

A) 0.315 
B) 0.700 
C) 0.900 
D) 0.985 
E) 2.100 
A) 0.315 
B) 0.700 
C) 0.900 
D) 0.985 
E) 2.100

Question 3

Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product.

Accepted Answer

A) True 
 B)False

Question 4

Preventive maintenance implies that we can determine when a system needs service or will need repair.

Accepted Answer

A) True 
 B)False

Question 5

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 6

What is the impact on system reliability of adding parts or components in parallel?

Accepted Answer

This will increase t

Question 7

A system is composed of three components A,B,and C.All three must function for the system to function.There are currently no backups in place.The system has a reliability of 0.966.If a backup is installed for component A,the new system reliability will be:

Accepted Answer

A) unchanged. 
B) less than 0.966. 
C) greater than it would be if a backup were also installed for component B. 
D) greater than 0.966 
E) none of the above 
A) unchanged. 
B) less than 0.966. 
C) greater than it would be if a backup were also installed for component B. 
D) greater than 0.966 
E) none of the above

Question 8

A job consists of a series of three tasks.Task 1 is performed correctly 98% of the time,task 2 is performed correctly 99% of the time,and task 3 is performed correctly 97% of the time.What is the reliability of this job?

Accepted Answer

A) 91.27% 
B) 94.11% 
C) 97.00% 
D) 98.00% 
E) 99.00% 
A) 91.27% 
B) 94.11% 
C) 97.00% 
D) 98.00% 
E) 99.00%

Question 9

What is the primary concept of total productive maintenance (TPM)? Identify the four elements that productive maintenance includes.

Accepted Answer

TPM's primary concept is reducing variab

Question 10

Suppose that a three-stage process had reliability ratings of .7,.8,and .9 at each station and that a failure at any station represented a failure for the entire process.If each station is given a redundant check with .9 reliability,what is the increase in system reliability?

Accepted Answer

Old = (.7)(.8)(.9)= .504 New =

Question 11

Explain why a small standard deviation of the MTBF distribution makes a product,machine,or process a good candidate for preventive maintenance while a large standard deviation does not.

Accepted Answer

A small standard deviation means that th

Question 12

A redundant part or component increases reliability because it is connected in parallel,not in series.

Accepted Answer

A) True 
 B)False

Question 13

The MTBF distributions of products,machines,or processes that have "settled in," or gone beyond the infant mortality phase,often follow the normal distribution.

Accepted Answer

A) True 
 B)False

Question 14

________ is the probability that a machine part or product will function properly for a specified time under stated conditions.

Accepted Answer

The answer of ________ is the probability that a machine...

Question 15

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 16

________ is the use of a component in parallel to raise reliabilities.

Accepted Answer

The answer of ________ is the use of a component...

Question 17

A system has three components in series with reliabilities 0.9,0.7,and 0.5.What is the system reliability?

Accepted Answer

A) 0.315 
B) 0.500 
C) 0.700 
D) 0.900 
E) 2.100 
A) 0.315 
B) 0.500 
C) 0.700 
D) 0.900 
E) 2.100

Question 18

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 19

As far as maintenance costs are concerned:

Accepted Answer

A) for low levels of maintenance commitment,breakdown maintenance costs exceed preventive maintenance costs. 
B) for low levels of maintenance commitment,preventive maintenance costs exceed breakdown maintenance costs. 
C) for high levels of maintenance commitment,breakdown maintenance costs exceed preventive maintenance costs. 
D) preventive maintenance is always more economical than breakdown maintenance. 
E) breakdown maintenance is always more economical than preventive maintenance when the "full cost of breakdowns" is taken into consideration. 
A) for low levels of maintenance commitment,breakdown maintenance costs exceed preventive maintenance costs. 
B) for low levels of maintenance commitment,preventive maintenance costs exceed breakdown maintenance costs. 
C) for high levels of maintenance commitment,breakdown maintenance costs exceed preventive maintenance costs. 
D) preventive maintenance is always more economical than breakdown maintenance. 
E) breakdown maintenance is always more economical than preventive maintenance when the "full cost of breakdowns" is taken into consideration.

Question 20

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

Exam 18: Maintenance and Reliability

When identifying the optimal maintenance policy,the cost of inventory maintained to compensate for the downtime is a cost often ignored.

A system has three components in parallel with reliabilities 0.9,0.7,and 0.5.What is the system reliability?

Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product.

Preventive maintenance implies that we can determine when a system needs service or will need repair.

MTBF measures the average:

What is the impact on system reliability of adding parts or components in parallel?

A system is composed of three components A,B,and C.All three must function for the system to function.There are currently no backups in place.The system has a reliability of 0.966.If a backup is installed for component A,the new system reliability will be:

A job consists of a series of three tasks.Task 1 is performed correctly 98% of the time,task 2 is performed correctly 99% of the time,and task 3 is performed correctly 97% of the time.What is the reliability of this job?

What is the primary concept of total productive maintenance (TPM)? Identify the four elements that productive maintenance includes.

Suppose that a three-stage process had reliability ratings of .7,.8,and .9 at each station and that a failure at any station represented a failure for the entire process.If each station is given a redundant check with .9 reliability,what is the increase in system reliability?

Explain why a small standard deviation of the MTBF distribution makes a product,machine,or process a good candidate for preventive maintenance while a large standard deviation does not.

A redundant part or component increases reliability because it is connected in parallel,not in series.

The MTBF distributions of products,machines,or processes that have "settled in," or gone beyond the infant mortality phase,often follow the normal distribution.

________ is the probability that a machine part or product will function properly for a specified time under stated conditions.

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

________ is the use of a component in parallel to raise reliabilities.

A system has three components in series with reliabilities 0.9,0.7,and 0.5.What is the system reliability?

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

As far as maintenance costs are concerned:

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

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