Siemens Data Science Intern Interview Questions and Answers

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

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

Motor is connected to PLC using motor starters or variable frequency drives. PID controller is used for precise control. Fans typically use induction motors. Inrush current is the initial surge of current when a motor starts. Starting current is usually higher than running current.

• Motor is connected to PLC using motor starters or variable frequency drives

• PID controller is used for precise control of motor speed or posi...read more