CRE Exam Questions

Probability ratio sequential tests are used for products designed to operate for a long period of time. This test is primarily based on:

The reliability of a device comprised of various parts functioning in series is the:

The maintenance action rate (MAR) may be mandated by contract. If an extruder is run continuously and experiences 24 maintenance actions (downtown) in one year, what is the MAR?

Which of the following is the key component in continuously providing a reliable product?

When requesting "worst case" design analysis, you expect the reliability group to:

An employee is injured on the job. The employer has proven to have a good safety and health program. Generally the employee has which of the following options available to him/her?

The two principal measures of failure during risk assessment are which of the following?

What is the minimum number of failure free trips that one must make in their car to be at least 95% confident it is 95% reliable?

Of the following, which is the MOST important reliability principle?

To which of the following types of systems is the concept mean-time-between-failures LEAST applicable?

Using complete field-based data, a reliability engineer has analyzed the reliability growth of a repairable system over the last 24 months. The analysis suggests a "no growth" cond...

A satellite has two redundant control systems, each has a failure rate (lambda) = 1?0 -6 failures/hour. If one of the systems fails, the failure rate for the remaining system incre...

The variations which the normal distribution curve describes are due to:

The following reliability block diagram shows components A, B, C, D and E with reliability Ra, Rb, Rc, Rd and Re, respectively. A or B are system entry points. On the basis of this...

For complex electronics systems, the major contributor to repair time is generally:

Which of the following techniques is MOST beneficial in tracking a process to determine whether corrective action should be taken?

An engineer must design a product with a probability of success 99%. Assume that both the strength and stress are normally distributed and that the standard deviations are the same...

An off road trip is contemplated using a utility vehicle equipped with five tires. The probability of failure for each tire on this trip follows the binomial distribution and is es...

An aggregate preventive maintenance program can greatly increase the overall availability of a system because of the

Concurrent engineering means

For single-failure modes, the probability plotting methods used to derive time-to-failure distribution parameters are applicable only when the data are

Measures of availability include:

The House of Quality incorporates a correlation matrix roof. This describes the relationships between which of the following?

Failure data are analyzed and a proportion of items survive to the end of the test. Data on these types of samples are referred as:

An air handling system has a MTBF of 8000 hours, MTBMct of 120 hours, and MMT (mean maintenance action time) of 230 hours. Determine the potential availability.

When failed field item are returned for failure investigation, which of the following steps should be taken first?

When testing is establish failure rate data and reliability predictions, which of the following is NOT normally a feasible acceleration factor with respect to rated conditions?

Product safety is a concern in today's environment. If a risk assessment is performed near the end of the design stage, consideration should be based on:

Given the sample data: 5, 15, 10, 7, 20. What is the unbiased estimator of the sample variance?

Total system effectiveness can be predicted during the conceptual or development design by considering three main elements of reliability. Which of the four elements does NOT apply...

What is this system's reliability at 700 hours? Component failure data is : - Failure rate of A = 0.0007 failures/hr - Reliability of B = 0.92 - MTTF of C = 1400 hours - Reliabilit...

What is meant by catastrophic failure?

In order to attain a high order of series reliability:

Which of the following statements is TRUE about probability distributions?

Censoring of reliability data indicates which of the following?

As the reliability engineer overseeing supplier development, you review the supplier's corrective action problem solving guidebook. It is a structured approach and you notice in th...

A product - design team is in the material-selection phase for a new product. The following four treatments need to be considered: What is the maximum number of treatment combinati...

All of the following statements are TRUE about confidence interval EXCEPT

A company has produced a new module. The failure data on 40 returns are shown below. Which of the following is the first step in the review of this situation ?

Customer feedback and data have been gathered on several new unknown failure modes, what would be an appropriate analysis tool to use on the data?

Which of the following activities prioritizes failure modes based on probability of failure, severity, and consequences?

In general, reliability testing is performed for which of the following reasons?

An airline maintains a fleet of 4-engine aircraft. Its maintenance records show that on the average an engine fails 3 times in 10,000 operating hours with normal preventive mainten...

The reliability parameter is one of the system performance parameters with significant influence on:

Maintainability of equipment may be measured in terms of:

What is meant by "derating"?

A consideration for proper part selection is:

Which of the following statements is TRUE nonrepairable items?

When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period

As the reliability engineer of a medium sized firm, you have developed a reliability test plan for the shop. The shop manufactures products on a medium batch size basis. The batche...