Addverb Technologies Interview Questions and Answers for Freshers

Polymorphism in C++ allows objects of different classes to be treated as objects of a common superclass.

• Polymorphism is achieved through virtual functions and function overriding.

• It allows for more flexibility and extensibility in code.

• Example: A base class 'Shape' with virtual function 'draw', and derived classes 'Circle' and 'Square' that override 'draw'.

Different motions in a drone are achieved through varying the speed and direction of the propellers.

• Changing the speed of the propellers controls the altitude of the drone.

• Varying the speed of propellers on different sides of the drone allows it to move forward, backward, left, or right.

• Adjusting the speed of the propellers diagonally creates rotational motion for turning.

• Combining these motions enables the drone to pe...read more

PID controller is a control loop feedback mechanism used in systems to control process variables.

• PID stands for Proportional, Integral, Derivative.

• Proportional term responds to the current error.

• Integral term corrects the accumulated error over time.

• Derivative term predicts future error based on current rate of change.

• Tuning involves adjusting the three parameters (P, I, D) to achieve desired system response.

• Example: I...read more

PLC stands for Programmable Logic Controller, used in industrial automation to control machinery and processes.

• PLC is a digital computer used for automation of electromechanical processes.

• It uses a programmable memory to store instructions and specific functions.

• PLCs are commonly used in manufacturing plants, assembly lines, and robotic devices.

• They can be programmed using ladder logic, function block diagrams, or stru...read more

Industrial automation involves the use of control systems such as robots and computers to handle different processes and machinery in an industrial setting.

• Industrial automation helps improve efficiency and productivity by reducing human intervention in repetitive tasks.

• It involves the use of sensors, actuators, and controllers to monitor and control various processes.

• Examples of industrial automation include automated...read more

Python offers a variety of tools for development, data analysis, web development, and more, enhancing productivity and functionality.

• IDEs: PyCharm, Visual Studio Code for efficient coding and debugging.

• Libraries: NumPy for numerical computations, Pandas for data manipulation.

• Web Frameworks: Django and Flask for building web applications.

• Testing Tools: PyTest and Unittest for automated testing.

• Data Visualization: Matplo...read more

Common database commands include CRUD operations: Create, Read, Update, and Delete, essential for data manipulation.

• CREATE: Used to add new records. Example: 'INSERT INTO users (name, age) VALUES ('Alice', 30);'

• READ: Retrieves data from the database. Example: 'SELECT * FROM users;'

• UPDATE: Modifies existing records. Example: 'UPDATE users SET age = 31 WHERE name = 'Alice';'

• DELETE: Removes records from the database. Exam...read more

Connecting a database to a Python script involves using libraries to establish a connection and execute queries.

• Use libraries like SQLite, MySQL Connector, or SQLAlchemy for database connections.

• Example with SQLite: import sqlite3; conn = sqlite3.connect('example.db')

• For MySQL: import mysql.connector; conn = mysql.connector.connect(user='user', password='password', host='localhost', database='dbname')

• Always close the c...read more

Virtual functions are functions in a base class that are overridden in derived classes, allowing for polymorphic behavior.

• Virtual functions are declared in a base class with the 'virtual' keyword.

• They are intended to be overridden in derived classes to provide specific implementations.

• When a virtual function is called through a base class pointer or reference, the derived class's implementation is executed.

• Virtual func...read more

Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.

• Inheritance allows a class to reuse code from another class, promoting code reusability and reducing redundancy.

• The class that is being inherited from is called the parent class or superclass, while the class that inherits from it is called the child class or subclass.

• Child classes can access the p...read more