Test on Statistical Analysis of Machine Maintenance Data
Statistical Analysis of Machine Maintenance Data Explained
Test: Reliability and Maintenance Analysis
20 questions
Question 1: For each machine, the failure history data includes exactly 300 recorded failures.
A. Ano
B. Ne
Explanation: The study materials state that there are 300 data pairs for each machine, corresponding to 301 failures, including the first and the last.
Question 2: To determine the maximum useful life of a machine, it is necessary to identify when the ageing process begins.
A. Ano
B. Ne
Explanation: The study materials state, "If ageing exists, we must determine when it begins in order to estimate the maximum useful life."
Question 3: Graphical analysis is presented as the exclusive method for determining if a machine has aged.
A. Ano
B. Ne
Explanation: The study materials state that 'besides numerical analysis, it is useful to create specific graphs' and that 'The graphs of these tables may also be useful', indicating that graphical analysis is a supplementary tool and not the exclusive method for detecting ageing.
Question 4: The "Conclusions" sheet requires a detailed statistical report for comparing the final condition of the three machines.
A. Ano
B. Ne
Explanation: The study materials specify that the "Conclusions" sheet must include "A short explanation comparing the final condition of the three machines," not a detailed statistical report.
Question 5: The analysis of how values change across tables, including those with 15-value sequential samples, is used to determine if machine ageing exists.
A. Ano
B. Ne
Explanation: The study materials state that 'To collect information for the preliminary analysis, there are three tables on the right side of the sheet. These tables contain data for a small statistical analysis (the same parameters mentioned before) using sequential samples instead of all the data. The first table uses data every 50 values (already done as reference), the second every 20, and the last every 15.' It also mentions, 'We will study how the values change across each table to check whether ageing exists (and when) or if the variations are random.'