Question 1

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

Accepted Answer

A) True 
 B)False  True

Question 2

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 additional multiplication by a value less than one, so that reliability must fall. Adding parts in parallel (the redundancy concept) increases reliability because only one part of the parallel system must function.

Question 3

A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up.

Accepted Answer

A) True 
 B)False  False

Question 4

TPM (total productive maintenance) is an application of TQM (total quality management) principles to the area of maintenance.

Accepted Answer

A) True 
 B)False

Question 5

Suppose that a three stage process in a nuclear reactor had reliability ratings of .98 at each station and that only one stage needed to be successful for the process to work. If the plant wants to establish 6-sigma standards, what % reliable redundant controls need to be added to each station.

Accepted Answer

6-sigma -> 3.4 defec

Question 6

Consider a product that is "settled in." Its MTBF distribution has been found to be normal with a mean of 10,000 hours and a standard deviation of 100 hours. What is the probability of a breakdown before 8,000 hours?
 Before 9,000 hours?
 Would you prefer a policy of preventive maintenance, or a policy of breakdown maintenance, on this product?
 Explain your choice.

Accepted Answer

Both of the specified times are far belo

Question 7

The probability that a product will function properly for a specified time under stated conditions is

Accepted Answer

A)  functionality 
B)  maintenance 
C)  durability 
D)  reliability 
E)  fitness for use 
A)  functionality 
B)  maintenance 
C)  durability 
D)  reliability 
E)  fitness for use

Question 8

How do many electronic firms deal with infant mortality in their products?

Accepted Answer

They "burn in" their products

Question 9

General Grant must send orders to General Butler. Carrier pigeons are the medium of choice. A single pigeon has a .7 probability of arriving at the proper destination in a timely fashion. How many pigeons, each carrying an identical set of orders, must Grant send in order for him to have 98% confidence that the orders reached General Butler?

Accepted Answer

2: 0.91 3: 0.973 4: 0.9919 One

Question 10

__________ 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 11

The reliability of a system in which each individual component must function in order for the entire system to function, and in which each component has its own unique reliability, independent of other components, is the product of the probabilities of each of those components.

Accepted Answer

A) True 
 B)False

Question 12

Which product design below has the higher system reliability?

Accepted Answer

A's reliability is .99 * .99 *

Question 13

The process that involves repair on an emergency or priority basis is known as

Accepted Answer

A)  breakdown maintenance 
B)  emergency maintenance 
C)  failure maintenance 
D)  preventive maintenance 
E)  priority maintenance 
A)  breakdown maintenance 
B)  emergency maintenance 
C)  failure maintenance 
D)  preventive maintenance 
E)  priority maintenance

Question 14

What is the reliability of the three components connected in series shown below?

Accepted Answer

A)  0.799425 
B)  0.85000 
C)  0.91333 
D)  0.95000 
E)  2.79 
A)  0.799425 
B)  0.85000 
C)  0.91333 
D)  0.95000 
E)  2.79

Question 15

Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; all others completed the test. FR(%) is __________ and MTBF is __________.

Accepted Answer

A)  10%; 1/1820 
B)  90%; 1/1820 
C)  10%; 1820 hours 
D)  10%; 1980 hours 
E)  cannot calculate from information provided 
A)  10%; 1/1820 
B)  90%; 1/1820 
C)  10%; 1820 hours 
D)  10%; 1980 hours 
E)  cannot calculate from information provided

Question 16

The Everstart is a battery with an intended design life of 72 months. Stephanie Bradley recently put five of these batteries through accelerated testing (the company couldn't wait six years) to simulate failure patterns. The test results had one failure at 26 months, one failure at 32 months, one failure at 50 months, and one failure at 62 months. Calculate FR(%), FR(N), and MTBF.

Accepted Answer

FR(%) = 4/5 or 80%.

Question 17

The product failure rate is the percentage of failures among the total number of products tested.

Accepted Answer

A) True 
 B)False

Question 18

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 19

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)  none of the above 
E)  unable to determine 
A)  50% 
B)  90% 
C)  99% 
D)  none of the above 
E)  unable to determine

Question 20

The objective of maintenance and reliability is to maintain the capability of the system.

Accepted Answer

A) True 
 B)False

Exam 20: Maintenance and Reliability

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

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?

A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up.

TPM (total productive maintenance) is an application of TQM (total quality management) principles to the area of maintenance.

Suppose that a three stage process in a nuclear reactor had reliability ratings of .98 at each station and that only one stage needed to be successful for the process to work. If the plant wants to establish 6-sigma standards, what % reliable redundant controls need to be added to each station.

The probability that a product will function properly for a specified time under stated conditions is

How do many electronic firms deal with infant mortality in their products?

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

The reliability of a system in which each individual component must function in order for the entire system to function, and in which each component has its own unique reliability, independent of other components, is the product of the probabilities of each of those components.

Which product design below has the higher system reliability?

The process that involves repair on an emergency or priority basis is known as

What is the reliability of the three components connected in series shown below?

Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; all others completed the test. FR(%) is __________ and MTBF is __________.

The product failure rate is the percentage of failures among the total number of products tested.

The normal distribution is an appropriate model of

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?

The objective of maintenance and reliability is to maintain the capability of the system.

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Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; all others completed the test. FR(%) is and MTBF is .