800+ Test Engineer Interview Questions and Answers

I rate myself as proficient in the use of CANalyzer.

• I have extensive experience using CANalyzer for analyzing and testing CAN bus communication.

• I am familiar with setting up and configuring CANalyzer for various testing scenarios.

• I have used CANalyzer to troubleshoot communication issues and analyze network traffic.

• I have successfully integrated CANalyzer with other testing tools and systems.

• I continuously update my knowledge and skills in using CANalyzer through training and...read more

Op amp stands for operational amplifier, used in electronic circuits for amplifying signals.

• Op amp is a high-gain electronic voltage amplifier with differential inputs.

• It is commonly used in signal processing, audio amplification, and instrumentation.

• Op amps have two inputs, inverting and non-inverting, and one output.

• They are often used in feedback circuits to control gain and performance.

Answer to a question on getting lines above and below a string in Test Engineering.

• Use file handling to read the file line by line

• Check if the current line contains the string

• If yes, store the previous and next lines in variables

• Repeat until end of file is reached

• Return the stored lines

A scenario is a single test case while a scenario outline is a template for multiple similar test cases with different inputs.

• Scenario is a single test case with specific inputs and expected outcomes.

• Scenario outline is a template for multiple test cases with placeholders for inputs.

• In scenario outline, examples table is used to provide different input values for each test case.

To select a box using Selenium, we can use the findElement() method with appropriate locator strategies.

• Identify the element using a unique locator such as ID, name, class name, etc.

• Use the findElement() method to locate the element on the web page.

• Perform actions on the element using various methods such as click(), sendKeys(), etc.

• Example: WebElement checkbox = driver.findElement(By.id("checkbox_id")); checkbox.click();

The output voltage time difference in a Schmitt trigger circuit depends on the input voltage levels and the hysteresis voltage.

• The output voltage time difference is determined by the hysteresis voltage of the Schmitt trigger.

• Hysteresis is the difference between the upper and lower threshold voltages of the Schmitt trigger.

• When the input voltage rises above the upper threshold, the output switches to a high state. It remains in this state until the input voltage falls below th...read more

Drop deletes the table structure and data, delete deletes specific rows, truncate deletes all rows.

• Drop is a DDL command, while delete and truncate are DML commands.

• Drop deletes the table structure and data, while delete deletes specific rows based on a condition.

• Truncate deletes all rows from the table, but keeps the table structure intact.

• Drop cannot be rolled back, while delete and truncate can be rolled back if used within a transaction.

• Examples: DROP TABLE table_name; DE...read more

Static, super, and final are Java keywords used for different purposes.

• Static keyword is used to create class-level variables and methods.

• Super keyword is used to call the parent class constructor or method.

• Final keyword is used to create constants or prevent method or class overriding.

Array is a collection of elements of same data type stored in contiguous memory locations. Linked list is a collection of nodes where each node contains data and a reference to the next node.

• Array has fixed size, linked list can grow dynamically

• Insertion and deletion is faster in linked list than array

• Accessing elements in array is faster than linked list

• Arrays are better for small data sets, linked lists are better for large data sets

• Example of array: int arr[] = {1, 2, 3, 4...read more

Smoke testing is a subset of sanity testing. Smoke testing verifies basic functionality, while sanity testing checks for logical errors.

• Smoke testing is performed to ensure that the critical functionalities of the software are working as expected.

• Sanity testing is performed to check if the newly added or modified functionality is working fine and does not break the existing functionalities.

• Smoke testing is executed after a build is received, while sanity testing is performed ...read more

Increment load is a gradual increase in user traffic while full load is the maximum user traffic.

• Increment load gradually increases user traffic

• Full load is the maximum user traffic

• Increment load helps identify system capacity

• Full load tests system performance under stress

• Examples: Increment load - adding 100 users every 5 minutes, Full load - adding 1000 users at once

If all electrical connections are ok, the problem on a not vibrating vehicle could be related to mechanical issues.

• Mechanical problem with the engine or transmission

• Faulty motor mounts

• Worn-out or damaged suspension components

• Imbalanced or damaged wheels or tires

• Issues with the drivetrain

Sanity testing is a narrow and deep testing while smoke testing is a wide and shallow testing.

• Sanity testing is done to check if the critical functionalities of the application are working fine after a small change.

• Smoke testing is done to check if the application is stable enough to proceed with further testing.

• Sanity testing is a subset of regression testing while smoke testing is a subset of acceptance testing.

• Sanity testing is more focused on specific areas while smoke te...read more

Protected internal access modifier allows access to members within the same assembly or derived classes.

• Can be applied to methods, properties, fields, and events

• Access is limited to the current assembly or derived classes

• Used when you want to restrict access to certain members within the same assembly or derived classes

• Example: protected internal int age = 25; // can be accessed within the same assembly or derived classes

Regression testing is testing the existing functionality of the software after making changes to ensure that it still works as expected. Retesting is testing the same functionality again after fixing the defects found in the previous testing.

• Regression testing is done to ensure that the changes made to the software do not affect the existing functionality.

• Retesting is done to ensure that the defects found in the previous testing have been fixed and the functionality is workin...read more

Field data collected in machine testing includes temperature, pressure, vibration, and power consumption.

• Temperature readings at various points on the machine

• Pressure measurements in different components

• Vibration levels during operation

• Power consumption data during different tasks

Performance testing includes load testing, stress testing, and capacity testing. Defect tracking involves identifying, reporting, and resolving issues. Boundary value analysis is a technique to test input values at the boundaries.

• Performance testing types: load testing, stress testing, capacity testing

• Defect tracking involves identifying, reporting, and resolving issues

• Maintenance techniques: regular updates, bug fixes, performance optimization

• Boundary value analysis tests in...read more

The question is not valid or coherent.

• There is no clear meaning or context to the question.

• It appears to be a random string of characters.

• Without more information, it is impossible to provide a meaningful answer.

Authorization is the process of determining if a user has the permission to access a resource, while authentication is the process of verifying the identity of a user.

• Authorization determines what a user can do, while authentication verifies who the user is.

• Authentication can be done using passwords, biometrics, tokens, etc.

• Authorization can be role-based, attribute-based, or rule-based.

• Auth key is a unique identifier used for authentication purposes.

• Types of Auth keys includ...read more

Software testing ensures quality and reliability of software. QC methods include functional, performance, and security testing.

• Software testing is the process of evaluating a software product to ensure it meets the specified requirements and quality standards

• Functional testing checks if the software meets the functional requirements

• Performance testing checks if the software performs well under different loads and stress

• Security testing checks if the software is secure from ex...read more

Normalization is used in databases to reduce data redundancy and improve data integrity.

• Normalization helps in organizing data in a database by eliminating redundant data and ensuring data integrity.

• It reduces data redundancy by breaking down large tables into smaller ones and linking them using relationships.

• Types of joins include inner join, outer join, left join, and right join.

• DBMS stands for Database Management System, while RDBMS stands for Relational Database Managemen...read more

Different types of exceptions in C# include SystemException, ApplicationException, and custom exceptions.

• SystemException is the base class for all exceptions in the System namespace.

• ApplicationException is the base class for all user-defined exceptions.

• Custom exceptions are exceptions created by the user to handle specific scenarios.

• Examples: DivideByZeroException, NullReferenceException, FileNotFoundException.

I have used the Page Object Model framework and handled exceptions using try-catch blocks.

• I have used the Page Object Model (POM) framework in my projects.

• POM helps in creating a structured and maintainable test automation framework.

• It separates the test logic from the page structure, making the code more readable and reusable.

• I have also used try-catch blocks to handle exceptions in my code.

• Try-catch blocks allow me to catch and handle any exceptions that occur during test e...read more

To make a product good quality, it needs to meet customer requirements and industry standards.

• Understand customer needs and expectations

• Define quality standards and requirements

• Implement quality control processes

• Conduct thorough testing and inspections

• Continuously improve product based on feedback

• Ensure compliance with industry regulations and standards

STLC (Software Testing Life Cycle) is a process of testing software in a well-planned and systematic way.

• STLC involves planning, designing, executing, and reporting of tests

• It includes various phases such as requirement analysis, test planning, test design, test execution, and test closure

• STLC ensures that the software is thoroughly tested and meets the quality standards

• It helps in identifying defects early in the development cycle, reducing the cost of fixing them later

• STLC ...read more

The extension for Android build file is .apk.

• The Android build file is typically named 'build.gradle'.

• The build.gradle file is used to configure the build settings for an Android project.

• The build process generates an APK (Android Package) file, which is the final output of the build process.

• The APK file contains the compiled code, resources, and other files required to run the app on an Android device.

I use tools like Postman, SoapUI, and Rest-Assured for API testing.

• Postman for manual testing and automation

• SoapUI for functional and load testing

• Rest-Assured for automated testing in Java

• Swagger for API documentation and testing

• JMeter for load testing

• Newman for running Postman collections in CI/CD pipelines

I play a variety of games including puzzle games, strategy games, and role-playing games.

• I enjoy playing puzzle games like Sudoku and Tetris, which require logical thinking and problem-solving skills.

• I also like strategy games such as Civilization and Age of Empires, where I have to plan and strategize to achieve victory.

• Role-playing games like The Witcher and Skyrim are another favorite genre of mine, as they allow me to immerse myself in a rich and detailed virtual world.

• In...read more

I expect a challenging work environment with opportunities for growth and learning.

• Clear understanding of job responsibilities and expectations

• Opportunities for training and development

• Collaborative work culture

• Regular feedback and performance evaluations

• Competitive compensation and benefits package

Java is platform-independent, object-oriented language while C++ is a high-level, general-purpose language with low-level features.

• Java is platform-independent, meaning it can run on any device with Java Virtual Machine (JVM) installed.

• C++ is a high-level language with low-level features, allowing for more control over hardware resources.

• Java is object-oriented, focusing on objects and classes for programming.

• C++ supports both procedural and object-oriented programming paradi...read more

Smoke testing is a preliminary test to check if the software build is stable, while sanity testing is a subset of regression testing to verify specific functionalities.

• Smoke testing is done to ensure the critical functionalities of the software are working fine after a new build, while sanity testing is done to verify specific areas of the application after changes.

• Smoke testing is a shallow and wide approach to testing, covering all major features, while sanity testing is a ...read more

Sprint retrospective meetings are held to reflect on the previous sprint, identify what went well and what could be improved, and make actionable plans for the next sprint.

• Reflect on the previous sprint's successes and challenges

• Identify areas for improvement and discuss potential solutions

• Create actionable plans for implementing improvements in the next sprint

• Encourage open communication and collaboration within the team

• Helps in continuous improvement and team growth

Experienced Test Engineer with a strong background in software testing, automation, and quality assurance methodologies.

• Over 5 years of experience in manual and automated testing across various applications.

• Proficient in using testing tools like Selenium, JIRA, and TestRail for test management and automation.

• Led a team in implementing a CI/CD pipeline that reduced deployment time by 30%.

• Conducted performance testing using JMeter, identifying bottlenecks that improved applicat...read more

I prioritize tasks by assessing urgency, impact, and resources, ensuring quality testing even under tight deadlines.

• Assess the project requirements and deadlines to identify critical tasks.

• Use a prioritization matrix to categorize tasks based on urgency and importance.

• Communicate with team members to understand dependencies and allocate resources effectively.

• Implement test automation for repetitive tasks to save time and increase efficiency.

• Regularly review progress and adjus...read more

White box testing is testing the internal structure of the system while black box testing is testing the external behavior of the system.

• White box testing involves testing the code, architecture, and design of the system.

• Black box testing involves testing the functionality and user interface of the system.

• White box testing is also known as clear box testing or structural testing.

• Black box testing is also known as functional testing or behavioral testing.

• Examples of white box ...read more

Answering questions related to bug tracking tools, SDLC, STLC, types of testing, and testing techniques.

• Bug tracking tools are used to track and manage bugs found during testing.

• SDLC (Software Development Life Cycle) is the process of developing software from planning to deployment.

• STLC (Software Testing Life Cycle) is the process of testing software from planning to release.

• Types of testing include functional, performance, security, usability, and more.

• Testing techniques inc...read more

OOP in Java is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.

• Encapsulation: Bundling data (fields) and methods (procedures) that operate on the data into a single unit (object).

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Polymorphism: The ability of different classes to be treated as instances of the same class through a common interface.

• Abstraction:...read more

A plastic machine is a device used to process plastic materials into various forms.

• Plastic machines typically consist of an extruder, which melts and shapes the plastic material.

• The melted plastic is then forced through a die to form the desired shape.

• Examples of plastic machines include injection molding machines, blow molding machines, and extrusion machines.

A use case diagram is a visual representation of the interactions between users and a system, showing the various use cases and actors involved.

• Use case diagrams are typically utilized in software development to capture the functional requirements of a system.

• They help in identifying the different ways users can interact with the system and the various scenarios that can occur.

• Use case diagrams show the relationships between actors (users) and use cases, helping in understand...read more

Verification ensures the product is built right, while validation ensures the right product is built.

• Verification involves checking if the software meets the specified requirements.

• Validation involves checking if the software meets the customer's needs and expectations.

• Example of low severity and high priority: Spelling mistake in the company logo on the homepage.

• Phases of agile methodologies: Planning, executing, monitoring, and adapting.

• Defect life cycle includes identifica...read more

Given-When-Then is a testing methodology used in API testing to define the preconditions, actions, and expected outcomes of a test case.

• Given: Defines the preconditions or initial state of the system

• When: Defines the actions or events that occur in the system

• Then: Defines the expected outcomes or results of the actions taken

The shell command to change the color of the text in the file is 'echo -e \033[COLORmTEXT\033[0m'

• The command uses the escape sequence '\033' to indicate the start of a color code

• Replace 'COLOR' with the desired color code (e.g. 31 for red)

• Replace 'TEXT' with the text to be colored

• Use '\033[0m' to reset the color back to default

• Example: 'echo -e \033[31mHello World\033[0m' will print 'Hello World' in red color'

Spring framework is a popular Java framework used for building enterprise-level applications.

• Provides a comprehensive programming and configuration model for modern Java-based enterprise applications.

• Offers features like inversion of control, aspect-oriented programming, and more.

• Includes modules for web development, data access, security, and more.

• Examples: Spring Boot, Spring MVC, Spring Security, Spring Data.

Transmission of 230 or 430 ac is not economical due to higher losses and inefficiencies in the system.

• Higher transmission losses with higher voltage levels

• Increased cost of infrastructure for higher voltage transmission lines

• Limited availability of equipment for 230 or 430 ac transmission

• Lower efficiency of transformers at higher voltage levels

Locators like ID, class name, XPath, CSS selector, etc. are used to identify web elements.

• ID - unique identifier for an element

• Class name - name of the class assigned to an element

• XPath - path to the element in the XML structure of the page

• CSS selector - selector based on CSS attributes of the element

4G architecture is a cellular network technology that uses packet switching to provide high-speed internet access.

• 4G stands for Fourth Generation and is the successor to 3G technology

• It uses Long Term Evolution (LTE) technology for faster data transfer rates

• The architecture consists of Radio Access Network (RAN), Evolved Packet Core (EPC), and User Equipment (UE)

• RAN includes base stations and antennas that communicate with UE

• EPC manages the flow of data between UE and the int...read more

OOPs concept in automation refers to the use of object-oriented programming principles in designing and implementing automated tests.

• Encapsulation: grouping related data and functions into a single unit (class) to hide implementation details

• Inheritance: creating new classes from existing ones to reuse code and add new functionality

• Polymorphism: using a single interface to represent multiple types of objects

• Abstraction: focusing on essential features and ignoring implementatio...read more