Power BI has become one of the most popular tools for data visualization and business intelligence. Companies use it to turn raw data into meaningful insights through dashboards, reports, and charts. If you’re preparing for a Power BI interview, it’s important to know more than just the interface—you’ll need to understand DAX functions, data modeling, and report optimization.
This page offers a well-rounded set of Power BI interview questions and answers to help you get ready. Whether you’re a fresher or a working professional, these questions cover key topics like Power Query, filters, relationships, and performance tuning.
Use this guide to sharpen your knowledge, build confidence, and prepare to answer both technical and scenario-based questions with ease. With Power BI skills in high demand, now is the perfect time to prepare well and stand out to employers in your next interview.
Answer: Most of the time, power BI gets assisted by the cloud to store the data. Power BI can use a desktop service. Microsoft Azure is used as the primary cloud service to store the data.
- Azure SQL Database
- Azure Blob Storage
Answer: Row-level security limits the data a user can view and has access to, and it relies on filters. Users can define the rules and roles in Power BI Desktop and also publish them to Power BI Service to configure row-level security.
Answer: There are three different views in Power BI, each of which serves another purpose:
- Report View – In this view, users can add visualizations and additional report pages and publish the same on the portal.
- Data View – In this view, data shaping can be performed using Query Editor tools.
- Model View – In this view, users can manage relationships between complex datasets.
Answer: Following are the critical components of Power BI:
- Power Pivot: Fetches and cleans data and loads on to Power Query.
- Power Query: Operates on the loaded data.
- Power Q&A: Makes it possible for users to interact with reports using simple English language.
- Power View: Lets users create interactive charts, graphs, maps, and other visuals.
- Power Map: Enables the processing of accurate geographic locations in datasets.
Answer: A content pack is defined as a ready-made collection of visualizations and Power BI reports using your chosen service. You’d use a content pack when you want to get up and running quickly instead of creating a report from scratch.
Answer: Power BI Desktop helps you to group the data in your visuals into chunks. You can, however, define your groups and bins. For grouping, use Ctrl + click to select multiple elements in the visual. Right-click one of those elements and, from the menu that appears, choose Group. In the Groups window, you can create new groups or modify existing ones.
Answer: Query folding is used when steps defined in the Query Editor are translated into SQL and executed by the source database instead of your device. It helps with scalability and efficient processing.
Answer: Power BI’s working system comprises four steps:
- Data Importing: The first step is to import the data and then convert it into a standard format.
- Data Cleaning: Once the data is assembled, it needs to be transformed or cleaned to remove unwanted data.
- Data Visualization: In this step, the data is visually represented on the Power BI desktop in the form of reports and dashboards with the help of powerful visualization tools.
- Save and Publish: Once your report is ready, you can save and publish the reports. These can be shared with users through mobile apps and the web.
Answer: A free Power BI version allows users 10 GB of storage space in the cloud for hosting Power BI reports. The maximum size allowed for a report in the cloud is 1 GB.
Answer: One of the most important features of Power BI is Bidirectional cross-filtering. This feature allows you to apply filters on both sides of a table relationship, using right-to-left and left-to-right options for their calculations. Through this, modelers can know how exactly particular relationships can work in multiple contexts.
Question 31: What are the different types of gateways available in Power BI? Why would you use them?
Answer: The Gateway acts as an extension between azure cloud administration and on-premise data sources. There are three major types of Gateways listed as follows:
- On-premises data gateway: Allows multiple users to connect to various on-premises data sources. You can use an on-premises data gateway with all supported services with a single gateway installation. For complex scenarios, this gateway is best suited.
- On-premises data gateway (personal mode): This data gateway allows one user to connect to sources that can’t be shared with others. This gateway is best suited to scenarios in which you only create reports and don’t need to share any data sources with others.
- The virtual network data gateway: This data gateway allows multiple users to connect various data sources that are secured by virtual networks. For complex scenarios in which multiple people access multiple data sources, this data gateway is highly preferred.
Answer: Z-order is a design strategy used to arrange visuals over shapes. It can also be defined as a method applied to implement when reports consist of multiple elements. Moreover, this can also be used to refresh the display when items in a report are changed.
Answer: Power BI provides some limited features to allow us to get started searching for data in a completely new way. On the other hand, Power BI Pro comes with some additional features like scheduling data, live data sources, storage capacity, along with complete interactivity and much more.
Answer: Responsive slicer is used to save the space on the report page. It is very easy to resize a responsive slicer to various sizes and shapes on a report page. The data contained on it is also rearranged according to it. If the visual becomes too small, an icon representing the visual ability takes its place. So, it also saves space on the report page.
Answer: In Power BI, the data alerts only work on data that is refreshed. When you refresh the data, the Power BI looks to see if an alert is set for that data or not. If the data has reached an alert threshold, it triggers an alert.
Answer: Power BI Designer is a standalone app used to create Power BI reports and upload them to Powerbi.com. It is a combination of Power Bi components i.e., Power View, Power Pivot, and Power Query.
Answer: Generally, the Distinct() and Values() functions are the same in Power BI. The only difference between them is that the Values() function don’t calculate null values, whereas the Distinct() function calculates even the null values.
Answer: The Power BI desktop supports data visualizations on smaller sets. Its limit is a maximum of 1 GB. But the Direct Query Method facilitates the user to build huge data sets and data visualizations. There is no limit to the dataset for the direct query method, and a 1GB dataset limit is not applicable in this method.
Answer: Users can set up for an automatic refresh over data based on daily or weekly requirements. Users can schedule only one refresh maximum daily unless they have Power BI Pro. The Schedule Refresh section uses the pull-down menu choices to select a frequency, time zone, and time of day.
Answer: Power Pivot uses the xVelocity engine. xVelocity can handle huge amounts of data, storing data in columnar databases. All data gets loaded into RAM memory when you use in-memory analytics, which boosts the processing speed.