CRE Exam Questions

Six independent samples are taken of smokestack gas. The mean value of a critical pollutant was 30.2 ppm for the six samples, with a standard deviation s = 5 ppm. Assuming that the...

It is appropriate to use the homogeneous Poisson process (HPP) when the failure rate of a system is

A component fails on the average of once every 4 years with 75% of the failures observed to occur during stormy weather. If there are 12 hours of stormy whether to every 240 hours...

Censoring of data occurs when

A first step in the FMECA is to:

Which of the following is (are) NOT (a) failure mechanism (s)?

Maintainability engineering is performed for all of the following reasons EXCEPT to

Software reliability planning includes all of the following EXCEPT

A device has a MTBF of 400 hours. Assuming an exponential distribution of time to failure, what is the maximum time of allowable operation if a reliability of .995 is required?

A component has a strength of 8000 psi and a standard deviation of 1200 psi. It needs to withstand a load with a mean value of 5000 psi and a standard deviation of 500 psi. Both st...

Product residual safety risk includes which two of the following?

Which of the following techniques would you use to determine the cost effectiveness of a new production machine, amortized over 5 years of expected useful life ? Current warranty c...

refer to a situation in which satellites in synchronous orbits around Earth are hit by meteors large enough to cause failure once every five years on average. What is the probabili...

Given mean-time-to-failure of 200 hours for each of two components, what is the probability of failure if both components operate in series for one hour?

On the basis of the fault tree below, what is the likelihood of the top event occurring?

The most important reliability characteristic of a product is that it:

What functions can normally be expected to be assigned to the Reliability Engineering Department of a company that emphasizes product reliability?

For a Weibull distribution the scale parameter, as a characteristic of time to failure, is a fixed percentile of the distribution regardless of its value. This percentile is:

Which of the following is NOT true about the Taguchi DOE approach?

Which test would potentially take longer than expected to complete?

In a FMECA, the potential failure modes are determined in order to improve system reliability. The effort to assess the severity of failure effects is part of the:

Which of the following activities has the greatest impact on product reliability?

Which of the following will provide the BEST information for determining the value of reliability activities?

The predicted reliability is higher than the long term realized probability. Which of the following is the MOST likely cause of this difference?

In the classification of defectives, such as DOD-STD-2101, if an item will produce a significant degradation in performance, the classification would be:

Human will perform more reliably if:

A reliability test conducted during the pre-production stage is called

Top probability of the top event is represented by which of the following expressions?

Which of the following is the BEST example of a random variable?

A company is in a multi-products, competitive market. Which of the following is the MOST appropriate strategy to help capture the maximum market share?

What is meant by reliability assurance?

For a company operating multiple units of production equipment, the observed failure rate is 42 x 10-6 failures per operating hour, and the preventive maintenance rate is 320 x 10-...

If the probability of a car starting on a sub-zero morning is 0.6, and we have two such cars. What is the probability that at least one of the cars will start on a sub-zero morning...

For a critical complex system, which of the following BEST expresses the ideal relationship between the planned cost of preventive maintenance (CPM) and cost of corrective maintena...

The mean of the normal logarithms of the repair times is 4.3 hours with a standard deviation of 0.7 hours. What is the maintainability for an allowed repair time of 120 hours?

Which of the following CANNOT be classified as a computer output device?

Which of the following models are used for software reliability?

If the elements in the following logic diagram are independent, reliability is:

A QFD team's primary goal should be to

A Pareto analysis of field failure data indicates that several significant failure categories are approximately equal in size. The BEST next course of action to take in selecting a...

The hazard function is:

While testing a new design, you experienced 3 failures in 100 tests. What is the lower confidence limit for the unit's tested reliability based on a confidence level of 0.90?

Which of the following graphs represents a product that is undergoing step-stress testing?

What is the difference between a system whose reliability prediction is MTTF versus one whose reliability prediction is MTBF?

When reliability goals are being developed, reliability predictions are initially used to

Which of the following considerations should a criticality analysis (CA) take into account?

A good practice in selection of components is to select standard parts. The valid reasons include:

What is the impact of high humidity on the reliability of mechanical systems?

When appraising the test environment, what factors should be considered to ensure an appropriate test strategy is implemented?

When selecting materials and components, what is a critical factor to consider to meet reliability goals?