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NEW QUESTION 60
A primary purpose of burn-in testing of parts is to
Response:
- A. Measure the temperature/stress distribution of parts.
- B. Ensure that parts are safe.
- C. Ensure that parts operate at elevated temperatures.
- D. Eliminate substandard parts.
Answer: D
NEW QUESTION 61
A satellite has two redundant control systems, each has a failure rate (lambda) = 1×10 -6 failures/hour. If one of the systems fails, the failure rate for the remaining system increases to 2×10 -5 failures/hour.
What is the reliability of the redundant control systems at 175,000 hours?
Response:
- A. 0.2507
- B. 0.690
- C. 0.7796
- D. 0.8609
Answer: C
NEW QUESTION 62
One method of evaluating the design reliability is to analyze the design assuming the worst case. Which of the following techniques is NOT applicable for worst case analysis?
Response:
- A. Root-sum squared.
- B. Eyring model
- C. Extreme value
- D. Monte Carlo
Answer: B
NEW QUESTION 63
A system is defined by the following reliability block diagram.
Which of the following block diagrams MOST simply represents the system reliability when Unit C is functioning?
Response:
- A. option A
- B. option C
- C. option B
- D. option D
Answer: B
NEW QUESTION 64
A certain light switch fails with a failure rate of 10 -4 . If the switch is used 20 times per week, what is the probability of the switch failing by the end of 3-year period?
Response:
- A. 2.68 × 10 -1
- B. 7.32 × 10 -5
- C. 7.32 × 10 -1
- D. 3.12 × 10 -1
Answer: A
NEW QUESTION 65
Product reliability concerns the relationship of product function to:
Response:
- A. Design.
- B. Customer demands.
- C. Time.
- D. Cost.
Answer: C
NEW QUESTION 66
A company has produced a new module. The failure data on 40 returns are shown below.
If the time to failure follows a normal distribution, what is the probability that time to failure exceeds 20 hours ?
Response:
- A. 0.050
- B. 0.028
- C. 0.950
- D. 0.972
Answer: B
NEW QUESTION 67
Which of the following is NOT considered good practice in reliability design?
Response:
- A. Simplifying item configuration.
- B. Using proven parts.
- C. Using failure mode and effects analysis (FMEA).
- D. Using series design.
Answer: D
NEW QUESTION 68
Which of the following is NOT an appropriate element in the definition of availability?
Response:
- A. The degree to which the system is in an operable and committable state at the start of a mission.
- B. The probability the system will perform its mission when required.
- C. The measure of the ability of a system to achieve mission objectives given the conditions during the mission.
- D. The ratio of the actual operating time to the scheduled operating time excluding PM.
Answer: D
NEW QUESTION 69
A system is turned off every 30 days for 5 minutes for on line maintenance. If the probability of system failure due to hardware failure is negligible, what is the system's unavailability?
Response:
- A. 0.0333
- B. 3.472 × 10 -4
- C. 0.999
- D. 1.157 × 10 -4
Answer: D
NEW QUESTION 70
What are the life cycle costs for a new stamping machine purchased by a metal fabrication plant?
Pertinent cost data follows:
Purchase Price = $230,000
Repair Costs = $107,000
Post Purchase Costs = $870,000
Start Up Costs = $125,000
Maintenance Costs = $420,000
Energy Costs = $325,000
Response:
- A. $1,100,000
- B. $787,000
- C. $1,207,000
- D. $2,077,000
Answer: A
NEW QUESTION 71
When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period Response:
- A. The time of the next failure is predictable from the time of the last failure.
- 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 equipment can be considered highly reliable.
Answer: C
NEW QUESTION 72
Maintenance repair tasks in a large scale system with constant repair rates follow which of the following distributions?
Response:
- A. Lognomal
- B. Geometric
- C. Normal
- D. Exponential
Answer: D
NEW QUESTION 73
A standard parts program is likely to have which of the following positive and negative effects?
Response:
- A. Option D
- B. Option B
- C. Option A
- D. Option C
Answer: A
NEW QUESTION 74
A 2 level 5 factor experiment is being conducted to optimize the reliability of an electronic control module. A half replicate of the standard full factorial experiment is proposed. The number of treatment combinations will be Response:
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 75
Consider the four normal stress and strength distributions described below. Which component would have the highest reliability?
Response:
- A. Both distributions have the same standard deviation but the strength average is higher than the stress average.
- B. The average and standard deviation of the stress and strength distributions are the same.
- C. The average and standard deviation of the stress distribution are both higher than for the strength curve.
- D. Both distributions have the same variance but the stress average is slightly higher than the strength average.
Answer: A
NEW QUESTION 76
According to the Reliability Analysis Center, which of the following design objectives is NOT supported by reliability and maintainability contributing tasks?
Response:
- A. Determine the feasibility of consistent product manufacture.
- B. Understand the impacts on design performance.
- C. Design validation.
- D. Use of proper parts and correct application.
Answer: A
NEW QUESTION 77
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).
Response:
- A. II only
- B. I and III only
- C. I, II and III
- D. II and III only
Answer: C
NEW QUESTION 78
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.
If the stress is known to be 3000 lbs with a standard deviation of 100 lbs, what must be the approximate designed strength?
Response:
- A. 3730 lbs.
- B. 4020 lbs.
- C. 3330 lbs.
- D. 3100 lbs.
Answer: C
NEW QUESTION 79
When a defense is prepared for a product liability action, all of the following would be considered elements of the assumption of risk the plaintiff must have EXCEPT:
Response:
- A. Understood the consequence of the risk.
- B. Had knowledge of the risk
- C. Contributed to the injury through negligence.
- D. Voluntarily undertaken the risk.
Answer: C
NEW QUESTION 80
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