CRE 試験問題を無料オンラインアクセス

If a test shows three failures in 50 hours of operation, how many failures will it show in 1000 hours of operation if the failure rate is constant?
Response:

• A.333
• B.60
• C.150
• D.20

Given mean-time-to-failure of 200 hours for each of two components, what is the probability of system failure if both components operate in parallel for one hour?
Response:

• A.P = 0.005
• B.P = 0.010
• C.P = 0.000025
• D.P = 0.001

Which of the following is a primary concern for a reliability engineer who uses publicly available sources for mechanical part-failure rates?
Response:

• A.Finding appropriate data for each application.
• B.Meeting parts-count requirements
• C.Recognizing that the quantity of such data is unlimited.
• D.Assuring that the data are in compliance with ISO standards.

A plastics plant operates 8 extruders producing plastic film. Production volume requirements cannot be met if less than 6 extruders are operating. There is a .30 probability that a machine stopping malfunction will occur.
What is the probability that 6 extruders can remain operating throughout the day?
Response:

• A.0.8059
• B.0.5783
• C.0.5518
• D.0.4482

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.Monte Carlo
• B.Extreme value
• C.Eyring model
• D.Root-sum squared.