Question 1

Reliability is the probability that a product or system will function when activated.

Accepted Answer

A) True 
 B)False

Question 2

Availability cannot be increased without improving the time between breakdowns.

Accepted Answer

A) True 
 B)False

Question 3

A system consists of two components, each of which must activate if the system is to activate.One component has a reliability of .99.The other has a reliability of .95.What is the overall system reliability?

Accepted Answer

A)  .99
B)  .95
C)  .94
D)  .90
E)  Cannot be determined with this information.F) A) and D)
G) C) and D)

Question 4

A system consists of two components, each of which must activate if the system is to activate.One component has a reliability of .99.The other has a reliability of .95.The components are independent of one another with respect to reliability.What is the overall system reliability?

Accepted Answer

A)  .99
B)  .95
C)  .94
D)  .90
E)  Cannot be determined with this information.F) A) and E)
G) B) and E)

Question 5

If a system depends on two sub-systems functioning when activated, the reliability of that system is equal to the lower reliability of the two sub-systems.

Accepted Answer

A) True 
 B)False  False

Question 6

Waygate's residential internet modem works well but is sensitive to power-line fluctuations.On average, this product hangs up and needs resetting every 200 hours.On average about 45 minutes is needed to reset this product.What is this product's availability?

Accepted Answer

A)  Not in excess of .75
B)  In excess of .75 but not in excess of .8
C)  In excess of .8 but not in excess of .9
D)  In excess of .9 but not in excess of .95
E)  In excess of .95F) C) and D)
G) All of the above

Question 7

Product reliability involves both short-term and long-term perspectives.

Accepted Answer

A) True 
 B)False

Question 8

An electrical appliance will not work unless component QK does.Component QK's reliability is 0.95.Every other part of the appliance is 100% reliable.What would the reliability of the appliance be if a backup QK were added?

Accepted Answer

A)  .95
B)  .9975
C)  .9025
D)  .9205
E)  .9795F) None of the above
G) A) and B) B

Question 9

Redundancy is often more cost-effective than increasing individual component reliability.

Accepted Answer

A) True 
 B)False  True

Question 10

The time between failures for an electrical appliance is exponentially distributed with a mean of 25 months.What is the probability that the next failure won't occur before 30 months have elapsed?

Accepted Answer

A)  Not in excess of .2
B)  In excess of .2 but not in excess of .3
C)  In excess of .3 but not in excess of .4
D)  In excess of .4 but not in excess of .6
E)  In excess of .6F) B) and E)
G) All of the above

Exam 20: Extension 4: Reliability

Reliability is the probability that a product or system will function when activated.

Correct Answer
verified

Availability cannot be increased without improving the time between breakdowns.

Correct Answer
verified

A system consists of two components, each of which must activate if the system is to activate.One component has a reliability of .99.The other has a reliability of .95.What is the overall system reliability?

Correct Answer
verified

A system consists of two components, each of which must activate if the system is to activate.One component has a reliability of .99.The other has a reliability of .95.The components are independent of one another with respect to reliability.What is the overall system reliability?

Correct Answer
verified

If a system depends on two sub-systems functioning when activated, the reliability of that system is equal to the lower reliability of the two sub-systems.

Correct Answer
verified
False

Waygate's residential internet modem works well but is sensitive to power-line fluctuations.On average, this product hangs up and needs resetting every 200 hours.On average about 45 minutes is needed to reset this product.What is this product's availability?

Correct Answer
verified

Product reliability involves both short-term and long-term perspectives.

Correct Answer
verified

An electrical appliance will not work unless component QK does.Component QK's reliability is 0.95.Every other part of the appliance is 100% reliable.What would the reliability of the appliance be if a backup QK were added?

Correct Answer
verified
B

Redundancy is often more cost-effective than increasing individual component reliability.

Correct Answer
verified
True

The time between failures for an electrical appliance is exponentially distributed with a mean of 25 months.What is the probability that the next failure won't occur before 30 months have elapsed?

Correct Answer
verified

Exam 20: Extension 4: Reliability

Reliability is the probability that a product or system will function when activated.

Correct AnswerverifiedShow Answer

Availability cannot be increased without improving the time between breakdowns.

Correct AnswerverifiedShow Answer

A system consists of two components, each of which must activate if the system is to activate.One component has a reliability of .99.The other has a reliability of .95.What is the overall system reliability?

Correct AnswerverifiedShow Answer

A system consists of two components, each of which must activate if the system is to activate.One component has a reliability of .99.The other has a reliability of .95.The components are independent of one another with respect to reliability.What is the overall system reliability?

Correct AnswerverifiedShow Answer

If a system depends on two sub-systems functioning when activated, the reliability of that system is equal to the lower reliability of the two sub-systems.

Correct AnswerverifiedFalse

Waygate's residential internet modem works well but is sensitive to power-line fluctuations.On average, this product hangs up and needs resetting every 200 hours.On average about 45 minutes is needed to reset this product.What is this product's availability?

Correct AnswerverifiedShow Answer

Product reliability involves both short-term and long-term perspectives.

Correct AnswerverifiedShow Answer

An electrical appliance will not work unless component QK does.Component QK's reliability is 0.95.Every other part of the appliance is 100% reliable.What would the reliability of the appliance be if a backup QK were added?

Correct AnswerverifiedB

Redundancy is often more cost-effective than increasing individual component reliability.

Correct AnswerverifiedTrue

The time between failures for an electrical appliance is exponentially distributed with a mean of 25 months.What is the probability that the next failure won't occur before 30 months have elapsed?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
False

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified
True

Correct Answer
verified