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NEW QUESTION # 35
The design function which assigns probability of failures between components or subsystems is called:
Response:
- A. Apportionment
- B. Confidence
- C. Qualification
- D. Significance
Answer: A
NEW QUESTION # 36
Using an extreme worst-case method of variability analysis, if the indicated performance characteristics values fall within specifications, the designer can be confident that:
Response:
- A. A low parameter tolerance limit is needed.
- B. A high parameter tolerance limit is needed.
- C. The system has high drift reliability.
- D. The probability of occurrence will be unknown.
Answer: C
NEW QUESTION # 37
Typical statistical distributions or confidence limits can be determined for accelerated tests. In the case of a step-stress test, the proper estimated distribution would be which of the following?
Response:
- A. Exponential
- B. Lognormal
- C. Weibull
- D. None, not meaningful.
Answer: D
NEW QUESTION # 38
Top probability of the top event is represented by which of the following expressions?
Response:
- A. Pr(B1) + Pr(B2)
- B. Pr(B1) + Pr(B2) - Pr(B1) Pr(B2)
- C. Pr(B1) Pr(B2)
- D. Pr(B1) Pr(B2) - [Pr(B1) + Pr(B2)]
Answer: B
NEW QUESTION # 39
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:
Response:
- A. Parameter data
- B. Censored Data.
- C. Control data
- D. Non-parameter data.
Answer: B
NEW QUESTION # 40
Product reliability concerns the relationship of product function to:
Response:
- A. Design.
- B. Cost.
- C. Customer demands.
- D. Time.
Answer: D
NEW QUESTION # 41
From a company's point of view, which of the following costs would be LEAST appropriate for determining the cost of reliability?
Response:
- A. Equipment depreciation.
- B. Reliability training
- C. Warranty cost.
- D. Life testing.
Answer: A
NEW QUESTION # 42
Which of the following is (are) NOT (a) failure mechanism (s)?
l. Cracked
ll. Over-stressing.
lll. Inadequate maintenance instructions.
lV. Oxidized.
Response:
- A. l and lV
- B. lll
- C. ll and lll
- D. l
Answer: A
NEW QUESTION # 43
Regarding computer hardware and software reliability, which of the available answers would NOT enhance software reliability?
I. Structured programming.
II. Redundant code programming.
III. Modular programming.
IV. Programming for fault tolerance.
Response:
- A. II and IV only
- B. I and III only
- C. All of the options will enhance software reliability
- D. II only
Answer: D
NEW QUESTION # 44
In standby parallel systems, imperfect switching means :
I. The switch is not perfect.
II. The secondary unit is on back-up.
III. The reliability of the system is less than with perfect switching.
IV. The secondary unit has the same reliability as the primary unit.
Response:
- A. I, II and III
- B. I and II
- C. All of the above
- D. I
Answer: A
NEW QUESTION # 45
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. I, II and III
- B. II only
- C. I and III only
- D. II and III only
Answer: A
NEW QUESTION # 46
Which of the following activities has the greatest impact on product reliability?
Response:
- A. Shipping and delivery
- B. Design.
- C. Service.
- D. Manufacturing
Answer: B
NEW QUESTION # 47
Your company has just installed a new computer data entry system and you must determine the new input error rates. Management requires you to report the error rate within 0.5%, at a 95% confidence level.
What sample size do you need if the population standard deviation is 1.2%?
Response:
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION # 48
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. Use of proper parts and correct application.
- C. Design validation.
- D. Understand the impacts on design performance.
Answer: A
NEW QUESTION # 49
Ideally for a FRACAS to be effective, how many failures should be allowed to pass before corrective action is to be undertaken?
Response:
- A. Third occurrence of a failure mode.
- B. First occurrence of a failure mode.
- C. Second occurrence of a failure mode.
- D. Fourth occurrence of a failure mode.
Answer: B
NEW QUESTION # 50
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?
Response:
- A. λ (stormy) = 3.938, λ (good) = 0.0656 failures/yr
- B. λ (stormy) = 6.594, λ (good) = 0.0458 failures/yr
- C. λ (stormy) = 4.000, λ (good) = 0.0655 failures/yr
- D. λ (stormy) = 4.202, λ (good) = 0.0525 failures/yr
Answer: A
NEW QUESTION # 51
Equivalence class partitioning is:
Response:
- A. A white-box method that divides errors into classes to reduce the amount of testing required.
- B. A black-box method that divides the inputs to a program into classes from which test cases can be derived.
- C. A white-box method that divides control paths into dependent and independent categories for testing.
- D. A black-box method that divides program functions into related groups for testing.
Answer: B
NEW QUESTION # 52
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. (97.10, 102.90)
- B. (95.85, 104.15)
- C. (86.87, 113.13)
- D. (98.42, 101.58)
Answer: A
NEW QUESTION # 53
All of the following Boolean algebra expression is incorrect EXCEPT?
Response:
- A. 1 - 1 = 1
- B. 1 + 1 = 2
- C. 1 + 0 = 1
- D. 1 - 0 = 0
Answer: C
NEW QUESTION # 54
Three identical subsystem are connected in an active parallel, non-load-sharing system. At least two of the tree must work in order for the system to work. The time to failure for each subsystem is exponential with a common failure rate, λ. The reliability of the system can be expressed as which of the following?
Response:
- A. 1 -3 e - 2 λt + 2e - 2 λt
- B. 3 e - 3 λt - 2e - 2 λt
- C. 3 e - 2 λt - 2e - 3 λt
- D. 1 -2 e - 3 λt - 3e - 2 λt
Answer: C
NEW QUESTION # 55
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