SACA Factory Data Analytics 4

Question 1

A manufacturer collects vibration data from 500 sensors every second. Which storage architecture best handles this volume?

Accepted Answer

Time-series database optimized for high-frequency writes

Answer

Relational database with row-based storage

Answer

Flat CSV files stored on a shared network drive

Answer

Spreadsheet with auto-archiving macros

Question 2

What does a scatter plot between tool wear and surface roughness primarily reveal?

Accepted Answer

The correlation or relationship between the two variables

Answer

The frequency distribution of roughness values

Answer

The control limits for surface roughness

Answer

The trend of tool wear over calendar weeks

Question 3

In predictive maintenance, what is 'remaining useful life' (RUL)?

Accepted Answer

The estimated time until a component will require replacement or failure

Answer

The total operating hours a machine has logged since installation

Answer

The scheduled maintenance interval defined by the OEM

Answer

The warranty period remaining on a piece of equipment

Question 4

Which statistical test would you use to determine if defect rates differ significantly across three production lines?

Accepted Answer

Chi-square test or ANOVA

Answer

Paired t-test

Answer

One-sample z-test

Answer

Pearson correlation coefficient

Question 5

What is feature engineering in the context of factory machine learning models?

Accepted Answer

Creating derived input variables from raw data to improve model performance

Answer

Installing new sensors to capture additional signals

Answer

Selecting the best ML algorithm for a given dataset

Answer

Tuning hyperparameters of a trained model

Question 6

A factory dashboard refreshes every 30 seconds with live OEE data. This is classified as:

Accepted Answer

Near real-time analytics

Answer

Batch analytics

Answer

Historical reporting

Answer

Prescriptive analytics

Question 7

Which concept describes the practice of training a predictive model on one production line and applying it to a new line with minimal retraining?

Accepted Answer

Transfer learning

Answer

Cross-validation

Answer

Ensemble modeling

Answer

Hyperparameter optimization