Q34. 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 confidence interval for the average tensile strength?
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Q35. 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?
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Q36. An exclusive “or” gate produces an output only if:
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Q37. 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 of good weather, what are the failure rates for stormy and good weather respectively?
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Q38. Which of the following is a primary concern for a reliability engineer who uses publicly available sources for mechanical part-failure rates?
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Q39. 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?
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Q40. The most important reliability characteristic of a product is that it:
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Q41. Which of the following can be used to determine the MTTR?
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Q42. Detection of trends of product failure is MOST important when system failure are Response:

Q43. Reliability prediction is:
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Q44. 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?
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Q45. Which of the following statements is TRUE about human factor points?
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Q46. The comparative financial effects of reliability over the designed operating time T of two systems built to perform the same function can be obtained by comparing the
I. Failure rates.
II. Operating life of each system.
III. Cost of each system (including repair, replacement, and loss).
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Q47. On the basis of the fault tree below, what is the likelihood of the top event occurring?

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Q48. 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 component has an exponential distribution with the same failure rate λ. The mean time to failure of this system is:
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Q49. A data collection, analysis, and reporting system should:
I. Permit detailed failure and failure rate analysis for varying environments, time periods, storage conditions, etc.
II. Provide distinction between items that failed and item that were wrongly removed.
III. Report data on successes as well as failures.
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Q50. Which of the following statistical distributions can be used to compare sample means?
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Q51. In 4 flips of a coin the probability of two heads and two tails (in any order) is:
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Q52. According to the Arrhenius Model, the expected life of an electronic component should:
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Q53. The software test design method that involves seeding errors into a program is known is:
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Q54. Failure occur on a system at 75, 79, 83, 85 hours. Assuming normality, one sided and unbiased the lower tolerance limit for 95% reliability with 90% confidence for this sample is:
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