TECH SPOT: SAMPLE CRE QUESTIONS (PART 7)

Share This Post

1. Three components in parallel have mean times to failure of 50, 60, & 70 hrs respectively. The mean repair times are 30, 40 & 50 hrs respectively. What is the steady state availability, assuming all non-failed components remain operating during system downtime?

a. 0.8891    b. 0.2187    c. 0.9375     d. 0.0419

2. The Reliability Qualification Test (RQT) is designed primarily to:

 a. Disclose weak parts

b. Simulate in-service evaluations of the delivered item.

 c. Assure that minimum acceptable reliability requirements have been met.

 d. Disclose design deficiencies under simulated conditions.

3.How can linear acceleration be verified, where

I. the Weibull slope under accelerated and normal conditions should be the same,

II. The failure mode should be the same

  a. Only I above     b. Only II above    c. I & II above     d. none of these

 4.  Components A,B, and C are exponentially distributed with mean times to  failure of 40 hrs, 60 hrs,  and 75 hours. If these components are in series, what is the system hazard function?

 a. .051    b. .055     c. .571    d. none of these

 5. Designing non-confusing displays to ease interaction of humans under stress is a method for reducing:

  a. Job satisfaction   b. Performance problems                                              

  c. The root cause of many problems    d. High-stress error

6.  The probability of an accident for the head event “H” to the right is:

  a. .1125   b.  .0689   c. .1100   d. none of theses

 7. Acceptance tests are:

   a. Performed to demonstrate that prime hardware meets design

       specification requirements including mission environments

   b. Conducted to verify conformance to quality requirements and to determine acceptability of hardware

   c. Performed on preliminary to prototype hardware to determine design and performance parameters

   d. None of the above

8. The primary reason that non-conforming material should be identified and segregated is:

   a. so that the cause of non conformity can de determined

   b. to provide statistical information for the “zero defects” program

   c. so it cannot be sued in production without proper authorization

   d. to obtain  samples of poor workmanship for use in the company’s training program

9.  Based on subgroups of n=10 the grand average is 10 and the average subgroup s=0.5. Compute the lower 

     control limit for the s chart.

   a. 0.051    b. 0.142    c. 0.243     d. 0.247

10. The process engineer believes that a modified process will produce the same results as the existing process, while costing less. The existing process was stable with a mean of 50 mm and s=0.06. The process engineer ran 25 units with the new process. The control chart for the 25 units was stable, the sample mean =49 and s=0.05. Compute the value of the appropriate statistic to test the null hypothesis that the variance of the modified process is the same as the variance of the original process. 

  a. 0.97    b. 4.31    c. 16.67    d. 21.22

Picture © B. Poncelet https://bennyponcelet.wordpress.com

More To Explore

General

Ellis R. Ott Scholarship for Applied Statistics and Quality Management

Ellis R. Ott Scholarships Supporting Graduate Students in Applied Statistics and Quality ManagementIn honor of Dr. Ellis R. Ott, late professor at Rutgers University and a founder of ASQ, the Ellis R. Ott Scholarship program awards two scholarships annually of $7500 to graduate students enrolled in or accepted to a master’s or doctoral program in

General

RMMR 2024 – July 25-26, 2024, Pittsburgh, Pennsylvania – call for abstracts

July 25-26, 2024, Pittsburgh, Pennsylvania Callfor Abstracts   R&MRisk Management in Real-World Environments   We invite you to submit abstracts for the presentations at the 4th Annual Reliability,Maintenance & Managing Risk Conference (RMMR 2024) to be held on July 25-26,2024 (with pre-conference courses to be offered on July 24), in Pittsburgh, PA.RMMR 2024 is sponsored

Scroll to Top