CQE Reliability and Risk Management

Question 1

What does the 'bathtub curve' in reliability engineering represent?

Accepted Answer

The failure rate pattern showing infant mortality, useful life, and wear-out phases

Answer

The cost of quality over product lifetime

Answer

Warranty cost trends over time

Answer

The relationship between reliability and price

Question 2

Mean Time Between Failures (MTBF) is a reliability metric applicable to:

Accepted Answer

Repairable items that can be restored to service

Answer

Non-repairable items only

Answer

Items during burn-in testing only

Answer

Software defect tracking

Question 3

In a Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is calculated as:

Accepted Answer

Severity × Occurrence × Detection

Answer

Severity + Occurrence + Detection

Answer

Severity × Occurrence ÷ Detection

Answer

Severity ÷ (Occurrence × Detection)

Question 4

What is the primary purpose of a Fault Tree Analysis (FTA)?

Accepted Answer

To identify combinations of events that could lead to a top-level undesired event

Answer

To rank suppliers by quality performance

Answer

To calculate process capability

Answer

To create control charts for critical parameters

Question 5

In reliability testing, accelerated life testing (ALT) is used to:

Accepted Answer

Expose products to stresses above normal levels to induce failures faster and predict life

Answer

Skip required reliability tests to save time

Answer

Test only a small fraction of production

Answer

Verify supplier component reliability

Question 6

Which reliability metric describes the probability that a system will be operational at any given random point in time?

Accepted Answer

Availability

Answer

MTBF

Answer

MTTF

Answer

Reliability function R(t)