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QUESTION 4 Rechargeable solar batteries are installed at a remote processing facility and are repeatedly charged and discharged throughout service. As their life progresses their ability to store charge capacitance) decreases. A failure is considered at the point where a battery cannot store more than 60% of it's original charge. Due to the remote location, batteries are inspected once per month. Further, due to harsh weather conditions batteries may fail due to mechanical faults. Batteries removed from service due to mechanical faults are not considered failures here as it is not the failure mode of interest. What type of censoring do we expect to see in the data? Interval AND right censoring a. b. Interval AND left censoring ONLY interval censoring OC. ONLY right censoring O d. QUESTION 5 You have been doing data analysis on a component. The beta value from the Weibull plot is close to 1. Your colleagues are telling you that this indicates random failure behaviour and therefore a fixed time maintenance strategy would not be appropriate. However, the component is subject to significant wear. Which of the following is NOT a possible explanation for the beta value of 1? Multiple failure modes might exist The condition monitoring program is not effective The time to failure data are suspect Failures are due to faulty maintenance QUESTION 6 Select the LEAST correct statement. O a. The 3 parameter Weibull model is generally recommended for use where a large dataset is available. Ob. The scale parameter in Weibull analysis stretches and/or shrinks the time axis O c. Both the shape parameter and the scale parameter are needed for estimating the mean time to failure O d. The shape parameter in Weibull analysis is responsible for describing the type of failure observed in the data (wear-in, random, wear-out etc.) QUESTION 4 Rechargeable solar batteries are installed at a remote processing facility and are repeatedly charged and discharged throughout service. As their life progresses their ability to store charge capacitance) decreases. A failure is considered at the point where a battery cannot store more than 60% of it's original charge. Due to the remote location, batteries are inspected once per month. Further, due to harsh weather conditions batteries may fail due to mechanical faults. Batteries removed from service due to mechanical faults are not considered failures here as it is not the failure mode of interest. What type of censoring do we expect to see in the data? Interval AND right censoring a. b. Interval AND left censoring ONLY interval censoring OC. ONLY right censoring O d. QUESTION 5 You have been doing data analysis on a component. The beta value from the Weibull plot is close to 1. Your colleagues are telling you that this indicates random failure behaviour and therefore a fixed time maintenance strategy would not be appropriate. However, the component is subject to significant wear. Which of the following is NOT a possible explanation for the beta value of 1? Multiple failure modes might exist The condition monitoring program is not effective The time to failure data are suspect Failures are due to faulty maintenance QUESTION 6 Select the LEAST correct statement. O a. The 3 parameter Weibull model is generally recommended for use where a large dataset is available. Ob. The scale parameter in Weibull analysis stretches and/or shrinks the time axis O c. Both the shape parameter and the scale parameter are needed for estimating the mean time to failure O d. The shape parameter in Weibull analysis is responsible for describing the type of failure observed in the data (wear-in, random, wear-out etc.)