FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 20: Extension 4: Reliability

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 1

Multiple Choice

Review LaterAdd Note

Review Later

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?

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 .95

F) A) and B)
G) A) and C)

Correct Answer

verified

Show Answer

Question 2

True/False

Review LaterAdd Note

Review Later

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

A) True
B) False

Correct Answer

verified

Show Answer

Question 3

Multiple Choice

Review LaterAdd Note

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?

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

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

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?

Availability cannot be increased without improving the time between breakdowns.

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?

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?

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.