ASQ Certified Quality Inspector & Reliability Engineer 2

Question 1

A quality inspector finds that 12 out of 200 sampled parts are nonconforming. What is the proportion nonconforming (p)?

Accepted Answer

0.06

Answer

p = 12/200 = 0.06, representing the fraction of defective parts in the sample.

Question 2

Which reliability measure describes the probability that a system performs its required function for a specified time under stated conditions?

Accepted Answer

Reliability

Answer

Reliability is formally defined as the probability of failure-free performance over a given time period under specified conditions.

Question 3

On a control chart, which condition indicates a process is out of statistical control?

Accepted Answer

Seven consecutive points on one side of the centerline

Answer

Seven consecutive points on one side of the centerline is a Western Electric rule indicating a non-random shift in the process mean.

Question 4

A bearing has a Mean Time Between Failures (MTBF) of 500 hours. What is its failure rate (λ)?

Accepted Answer

0.002 failures/hour

Answer

Failure rate λ = 1/MTBF = 1/500 = 0.002 failures per hour for exponentially distributed failures.

Question 5

Which sampling plan type is used when a decision must be made after inspecting only one sample?

Accepted Answer

Single sampling

Answer

Single sampling plans require one fixed sample to be drawn and inspected before making an accept/reject decision.

ASQ - American Society for Quality Certification Practice Test