First Solar Interview Questions, Process, and Tips

SQL joins are used to combine data from two or more tables based on a related column between them.

• INNER JOIN: returns only the matching rows from both tables

• LEFT JOIN: returns all rows from the left table and matching rows from the right table

• RIGHT JOIN: returns all rows from the right table and matching rows from the left table

• FULL OUTER JOIN: returns all rows from both tables, with NULL values in the columns where th...read more

Normal distribution is a bell-shaped curve that represents the probability distribution of a set of data. Standard deviation measures the spread of the data around the mean.

• Normal distribution is symmetrical around the mean.

• 68% of the data falls within one standard deviation of the mean.

• 95% of the data falls within two standard deviations of the mean.

• 99.7% of the data falls within three standard deviations of the mean.

• ...read more

Outliers can be detected using statistical methods and treated by either removing them or replacing them with a more appropriate value.

• Use box plots, scatter plots, or histograms to visually identify outliers

• Calculate the z-score or interquartile range (IQR) to identify outliers statistically

• Remove outliers if they are due to data entry errors or measurement errors

• Replace outliers with a more appropriate value if they ...read more

Multicollinearity can be dealt with by using techniques like PCA, VIF, and dropping one of the correlated variables.

• Perform Principal Component Analysis (PCA) to reduce the number of variables

• Calculate Variance Inflation Factor (VIF) to identify highly correlated variables

• Drop one of the correlated variables to avoid redundancy

• Use regularization techniques like Ridge or Lasso regression

• Collect more data to increase the

Designing a dashboard involves identifying key metrics, selecting appropriate visualizations, and organizing the layout.

• Identify the purpose and audience of the dashboard

• Select key metrics and KPIs to display

• Choose appropriate visualizations for each metric

• Organize the layout to be intuitive and easy to navigate

• Consider color schemes and font choices for readability

• Test and iterate on the design based on user feedback

Regularly monitor data sources and update pipeline accordingly.

• Set up alerts to notify when changes occur in data sources

• Regularly check data sources for changes

• Update pipeline code to handle changes in data sources

• Test pipeline thoroughly after making changes

• Document changes made to pipeline for future reference

Solar cells convert sunlight into electricity through the photovoltaic effect.

• Solar cells are made of semiconductor materials such as silicon.

• When sunlight hits the solar cell, it excites electrons in the semiconductor material.

• The excited electrons are then captured by an electric field within the cell, creating a flow of electricity.

• Solar cells can be used to power homes, businesses, and even satellites in space.

PN junction is a boundary between p-type and n-type semiconductor materials used in electronic devices.

• PN junction is formed by doping one side of a semiconductor crystal with impurities that create an excess of electrons (n-type) or holes (p-type).

• When the two sides are brought together, the excess electrons and holes diffuse across the junction and recombine, creating a depletion region with no mobile charge carriers...read more

SPC stands for Statistical Process Control. Spec limit is the upper and lower limit of a product's specification. Control limit is the upper and lower limit of a process's performance.

• SPC is a method of monitoring and controlling a process to ensure it is within the desired range of performance.

• Spec limit is the range of acceptable values for a product's characteristics, determined by customer requirements or industry ...read more