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NEW QUESTION 154
Given a system requirement of maintainability (MTTR) of 4.7 hours. There are 5 devices in series with the following individual failure rates and MTTR.
Determine the K factor.
Response:
- A. 1.06
- B. 0.94
- C. 0.82
- D. 0.87
Answer: C
NEW QUESTION 155
15 rocket booster engines were tested for a total of 5 hours. Three engines failed. What is the two-sided confidence interval for MTBF using 95% confidence?
Response:
- A. 0.69, 8.06
- B. 0.57, 8.06
- C. 0.80, 9.50
- D. 0.75, 9.20
Answer: B
NEW QUESTION 156
You have written what you feel is an excellent book on reliability principles. Your company wants you to conduct company-wide training classes on a specific reliability topic.
Your advice is sought and you recommend your text because you are familiar with it. What other professional action should be immediately taken?
Response:
- A. Recommend the work of another author to avoid the appearance of impropriety.
- B. Inform your employer of your business connection to the book.
- C. If the book is commercially available and your royalty is small, no other action is required.
- D. Be modest and nonassuming when explaining your work.
Answer: B
NEW QUESTION 157
A life test was conducted on 10 units of a product. The average failure time of the units is 100 hours, and the standard deviation is 5 hours. If the failure time follows a normal distribution, what is the 90% confidence interval of the mean failure time for this product?
Response:
- A. (95.85, 104.15)
- B. (97.10, 102.90)
- C. (86.87, 113.13)
- D. (98.42, 101.58)
Answer: B
NEW QUESTION 158
Experimental design plans usually call for testing a number of factors and keeping all other conditions as nearly constant as possible.
Taguchi Methods call for similar techniques, but with a twist. Noise conditions are changes a bit to determine robustness. Where are the noise factors placed?
Response:
- A. Inner array.
- B. Quadratic array.
- C. Outer array.
- D. Control array.
Answer: C
NEW QUESTION 159
When requesting "worst case" design analysis, you expect the reliability group to:
Response:
- A. Analyze only those products failing to meet specification requirements.
- B. Assume all subassembly tolerances are at their maximum limit.
- C. Analyze the worst rejects.
- D. Determine whether product requirements can be met with subassemblies assumed at their worst combination of tolerances.
Answer: D
NEW QUESTION 160
High cycle fatigue would MOST likely result in
Response:
- A. Constant failure.
- B. Wear out failure.
- C. Mid-life failure.
- D. Early failure.
Answer: B
NEW QUESTION 161
Which of the following should be avoided in parts selection to enhance the design reliability?
Response:
- A. Selection of high reliability parts.
- B. Selection of redundant parts.
- C. Selection of exotic technology parts.
- D. Selection of standard parts.
Answer: C
NEW QUESTION 162
Maintainability considerations are important in the design of:
Response:
- A. Consumer televisions.
- B. Integrated circuits.
- C. Unmanned satellites.
- D. Modern automobiles.
Answer: D
NEW QUESTION 163
Which answer mathematically expresses the reliability of an active parallel system in which all component reliabilities are unequal?
Response:
- A. Rs = [RaRbRc] / [Ra + Rb + Rc]
- B. Rs = RaRbRc - (RaRb + RbRc + RaRc) + (Ra + Rb + Rc)
- C. Rs = Ra + Rb + Rc - RaRbRc
- D. Rs = [RaRbRc + RaRb + RbRc + RaRc ] / [Ra + Rb + Rc]
Answer: B
NEW QUESTION 164
Reliability objectives and requirements should be set in which of the following life cycle phases?
Response:
- A. Concept and design.
- B. Validation and test.
- C. Full scale design and development.
- D. Operation and repair.
Answer: A
NEW QUESTION 165
The hazard function is:
I. The probability of failure during a very small time interval, assuming a failure occurs before that time.
II. A function of constant failure rate only.
III. A function of increasing failure rate only.
IV. The ratio of the probability density function to the reliability function.
Response:
- A. III only
- B. II only
- C. IV only
- D. I only
Answer: C
NEW QUESTION 166
The primary reason for improving equipment accessibility is to:
Response:
- A. Improve equipment reliability.
- B. Improve service life.
- C. Minimize equipment downtime.
- D. Maximize labor utilizations.
Answer: C
NEW QUESTION 167
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 strength and load are normally distributed.
What is the probability of failure for the component?
Response:
- A. 0.0104
- B. 0.0059
- C. 0.0014
- D. 0.0174
Answer: A
NEW QUESTION 168
When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period Response:
- A. The equipment can be considered highly reliable.
- B. There can be only one type of failure in the system.
- C. The reliability of the system can be expressed as an exponential function
- D. The time of the next failure is predictable from the time of the last failure.
Answer: C
NEW QUESTION 169
If a component has a known constant failure rate of 0.0037 failures per hour ; the reliability of two of these components in a series alignment would be:
Response:
- A. Insufficient information to solve problem.
- B. Dependent on the wear out rate of a mating subsystem
- C. 99.63 percent.
- D. Less than 99 percent.
Answer: A
NEW QUESTION 170
In a certain application, two identical transducers are used to measure the vacuum in a system. The system is considered to have failed if either of the vacuums read by the transducers varies from the standard by more than 10mm Hg.
Which of the following is the correct reliability logic block diagram for the transducer assembly?
Response:
- A. Option D
- B. Option C
- C. Option B
- D. Option A
Answer: D
NEW QUESTION 171
A highly accelerated stress screening (HASS) test can help to detect and separate units with manufacturing defects. HASS test limits are typically developed from:
Response:
- A. Bayesian reliability testing.
- B. Highly Accelerated Life Tests.
- C. Production reliability acceptance tests.
- D. Statistical process control data
Answer: B
NEW QUESTION 172
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