CRE Exam Questions

What is the Z value needed to conduct a two tail test in a statistical inference problem, specifying 90% level of confidence?

Derating enhance reliability in all of the following ways EXCEPT by

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

Which of the following graphs represents a product that is a good candidate for an accelerated degradation test involving overstress testing?

It is often observed that unscheduled maintenance:

Product safety standards do NOT include:

What is the MOST vital information to know about a system in order to perform a hardware FMECA?

The main purpose of environmental stress screening is which of the following?

A standard parts program is likely to have which of the following positive and negative effects?

A failure that leaves the system fully functional is:

Which one of the following quantitative methods does NOT apply to the assessment of actual system/component reliability?

The optimum cost point for total life cycle costs occurs:

Preventive maintenance programs are MOST effective when

The margin of safety in a design is BEST described by which of the following statements?

Which of the following is an appropriate use for experimental design?

In the bath curve model, which one of the sections represents the period when catastrophic failure are likely to occur?

Which of the following is NOT a degradation mechanism?

A Reliability Engineering Department is conducting a training needs assessment. Which of these techniques are used for a training needs assessment?

When reliability people say they are breaking the monopoly of the designer they mean

For equipment consisting of three components connected in series whose respective reliabilities are 0.95, 0.94, 0.96, which could be used to calculate total probability?

In order to sustain a high system reliability in the field, it is BEST to:

A mission profile is:

The purpose of a failure reporting, analysis and corrective action system(FRACAS) includes which two of the following?

Ideally for a FRACAS to be effective, how many failures should be allowed to pass before corrective action is to be undertaken?

The following fault tree diagram was developed by a team. The probability are as follow: A1 = 0.90 B1 = 0.90 C1 = 0.80 A2 = 0.80 B3 = 0.80 C2 = 0.70 A4 = 0.70 The likelihood that t...

One of the descriptions of component failures can be explained by a mathematical model with a formula showing that the rate of chemical reaction varies exponentially with a rise in...

Which mathematical method provides a solution, has a time dimension and is solved numerically?

A fault tree analysis (FTA) is a design analysis technique constructed from a "top event". A basic problem with this technique in comparison to a FMECA would be which of the follow...

When a large number of components have been tested for a fixed time with no failure then:

Which of the following is TRUE about hypothesis testing?

The reliability of a complex system can BEST be improved by:

A system has components connected in active parallel. At least n - 1 of the components must operate for the system to function properly. Suppose the time to failure of each compone...

Typical statistical distributions or confidence limits can be determined for accelerated tests. In the case of a step-stress test, the proper estimated distribution would be which...

Derating parts in specific applications is performed in order to:

Feedback channels for the planning, management and assessment of product safety should include:

Which of the following provides the maximum benefit of parts standardization?

The primary reason for improving equipment accessibility is to:

The software test design method that involves seeding errors into a program is known is:

The "least squares" description in regression analysis pertains to:

All of the following techniques are appropriate for reliability apportionment EXCEPT

Root cause analysis provides a common sense approach to evaluating a problem. Align the following action steps in proper sequence from start to finish.

Eliminating hazards can be accomplished several ways. Which of the following does NOT eliminate a hazard?

The results of a designed experiment are to be analyzed using a chi-square test. There are five treatments under consideration and each treatment falls under two categories (succes...

Which one of the following would NOT be necessary in a corrective action status report?

Reliability predictions can be used for all of the following purpose EXCEPT to

Three identical subsystem are connected in an active parallel, non-load-sharing system. At least two of the tree must work in order for the system to work. The time to failure for...

A certain equipment has a MTBF of m = 300 hours. Assuming an exponential distribution of time to failure, what is the maximum time of allowable operation if a reliability of 0.999...

All of the following activities would be appropriate during the design and development stage of a product' life cycle EXCEPT:

A random sample of 100 bars of aluminum shows a tensile strength mean of 30,000 psi and a standard deviation of 3,000 psi. On the basis of this sample, what is the 95 percent confi...

A person takes their car to the repair shop and it stops doing what it was previously doing. This is an example of: