Free ASQ CRE Exam Dumps Questions & Answers

A satellite has two redundant control systems, each has a failure rate (lambda) = 1×10 -6 failures/hour. If one of the systems fails, the failure rate for the remaining system increases to 2×10 -5 failures/hour.
What is the reliability of the redundant control systems at 175,000 hours?
Response:

• A.0.2507
• B.0.7796
• C.0.690
• D.0.8609

Analysis of data on all product returns is important because:
I. Failure rates change with length of product usage.
II. Changes in design and in customer use are often well reflected.
III. Immediate feedback and analysis of product performance becomes available.
Response:

• A.I, II and III
• B.II and III only
• C.I only
• D.I and III only

Which of the following reliability tests is conducted during the prototype stage?
Response:

• A.Qualification test
• B.Screening test.
• C.Acceptance test.
• D.Demonstration test

In a life test of 4 batteries, failures were observed after 10, 30, and 40 hours. The 4th battery was tested
75 hours without failure, at which time the test was terminated.
What are the estimated Mean-Time-To-Failure (theta) and failure rate (lambda)?
Response:

• A.Estimated MTTF = .019; Failure rate = 52
• B.Estimated MTTF = 27; Failure rate = .038
• C.Estimated MTTF = 52; Failure rate = .019
• D.Estimated MTTF = 14; Failure rate = .017

Censoring of data occurs when
Response:

• A.Product data are considered biased.
• B.Product data are sequenced and questionable
• C.Data collection is time-truncated.
• D.Questionable methods of data collection are used.