30+ Primetals Technologies Interview Questions and Answers

Serialisation is the process of converting an object into a format that can be easily stored or transmitted.

• Serialisation is used in data storage and transmission, allowing objects to be saved to a file or sent over a network.

• It is commonly used in programming languages to convert objects into a byte stream for storage or communication.

• Examples include saving an object to a file in JSON or XML format, or sending an object over a network using protocols like HTTP.

SQL is a programming language used for managing and manipulating relational databases.

• SQL stands for Structured Query Language.

• It is used to communicate with and manipulate databases.

• SQL can be used to retrieve data, update data, insert data, and delete data from databases.

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE.

• Examples of SQL database systems include MySQL, PostgreSQL, Oracle, SQL Server.

Java is a high-level programming language known for its portability, security, and object-oriented features.

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

• It is object-oriented, allowing for the creation of reusable code through classes and objects.

• Java is known for its security features, such as sandboxing and encryption.

• It supports multithreading, allowing for concurrent execution of multiple tasks.

• Java has a rich standard l...read more

MVC architecture is a software design pattern that separates an application into three main components: Model, View, and Controller.

• Model represents the data and business logic of the application

• View is responsible for displaying the data to the user

• Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly

• Example: In a web application, the Model could be a database, the View could be the HTML/CSS for the user interface, ...read more

Promises are a feature in JavaScript that allow asynchronous operations to be handled in a more organized and readable way.

• Promises are objects that represent the eventual completion or failure of an asynchronous operation.

• They are used to handle asynchronous code and avoid callback hell.

• Promises have three states: pending, fulfilled, or rejected.

• They can be chained together using methods like .then() and .catch().

• Promises can be created using the Promise constructor or by us...read more

Event loop is a mechanism that allows a program to efficiently handle and respond to multiple events or tasks concurrently.

• Event loop is commonly used in asynchronous programming.

• It manages the execution of tasks or events in a non-blocking manner.

• Event loop continuously checks for events or tasks and executes them when they are ready.

• It helps prevent blocking and allows for efficient utilization of system resources.

• Examples of event loop implementations include Node.js event...read more

Microservices are developed by breaking down a large application into smaller, independent services that communicate with each other through APIs.

• Identify the boundaries of each microservice based on business capabilities

• Design each microservice to be independent and loosely coupled

• Use lightweight protocols like HTTP or messaging queues for communication between microservices

• Implement each microservice using the technology stack best suited for its requirements

• Deploy microser...read more

Google Maps - a web mapping service developed by Google

• Provides satellite imagery, street maps, panoramic views, and route planning

• Used for navigation, finding local businesses, and exploring new places

• Available on desktop and mobile devices

Oops concepts are fundamental principles of object-oriented programming such as inheritance, polymorphism, encapsulation, and abstraction.

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

• Polymorphism: Allows objects to be treated as instances of their parent class or as instances of their own class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hiding the implementation details and showing onl...read more

I will talk about my passion for data analysis and how I have used it to solve complex problems in previous projects.

• I have always been fascinated by the power of data analysis in uncovering insights and driving decision-making.

• In my previous role, I used data analysis to identify trends and patterns in customer behavior, leading to a 10% increase in sales.

• I am proficient in various data analysis tools such as Excel, SQL, and Python, and have a strong foundation in statistica...read more

OOPS Concepts are fundamental principles of Object-Oriented Programming.

• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - ability of a class to inherit properties and methods from its parent class

• Polymorphism - ability of objects to take on multiple forms

• Abstraction - hiding of complex implementation details from the user

• Example code: class Car { private String make; public void setMake(String make) { this.make = make; } }

TestNG is a testing framework for Java. WebElement represents a single element on a web page, while WebElements represents a collection of elements. 'finally' is a keyword used in exception handling. There are different types of exceptions in Selenium. To handle frames in Selenium, we can use the switchTo() method.

• TestNG is a testing framework for Java

• WebElement represents a single element on a web page

• WebElements represents a collection of elements

• 'finally' is a keyword used...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They are used in power distribution systems to step up the voltage for long-distance transmission and step it down for local distribution.

• Transformers are also used in electronic devices to isolate circuits, match impedances, and provide galvani...read more

Arrow functions are concise syntax for writing functions in JavaScript, compared to normal functions.

• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have 'arguments' object.

• Arrow functions cannot be used as constructors.

• Arrow functions are more concise and easier to read compared to normal functions.

To find 2 unique numbers in an array with others occurring twice.

• Iterate through the array and use a hash table to count the occurrences of each number.

• Iterate through the hash table and find the two numbers with a count of 1.

• Return the two unique numbers as an array of strings.

Automation is the use of technology to perform tasks without human intervention.

• Increases efficiency and productivity

• Reduces errors and improves accuracy

• Saves time and money

• Allows for 24/7 operation

• Enables scalability and consistency

• Examples include robotic process automation, industrial automation, and test automation

A closure is a function that has access to its own scope, as well as the outer scope in which it was defined.

• A closure can access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and asynchronous code.

• Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outerVar); }; }; const innerFunction = outerFunction(); innerFunction(); // Output: 'I ...read more

PLC stands for Programmable Logic Controller. It is an industrial computer used to automate processes and control machinery.

• PLCs are highly reliable and can operate in harsh environments

• They can be easily programmed and reprogrammed to accommodate changes in the manufacturing process

• PLCs can communicate with other devices and systems, allowing for seamless integration

• They can improve efficiency and productivity while reducing costs

• Examples of PLC applications include assembly...read more

Instrumentation refers to the use of instruments or devices to measure, control, or monitor a process or system.

• Instruments are used to gather data about a process or system

• Data is then used to control or monitor the process or system

• Examples include sensors, gauges, and meters

• Instrumentation is used in various industries such as manufacturing, energy, and transportation

Panel design refers to the process of designing and creating electrical control panels for industrial automation systems.

• Panel design involves selecting appropriate components such as circuit breakers, relays, and switches.

• The design must also consider factors such as wiring, labeling, and safety standards.

• CAD software is often used to create detailed panel layouts and schematics.

• Examples of industrial automation systems that require panel design include manufacturing lines, ...read more

Allocate minimum number of pages

• Determine the total content to be included

• Decide on the layout and formatting

• Consider the font size and spacing

• Allocate pages based on the above factors

Calculate the height of a binary tree and implement factorial code in Python.

• To calculate the height of a binary tree, you can use a recursive approach where you find the height of the left and right subtrees and return the maximum height plus one.

• For factorial code in Python, you can use a recursive function that multiplies the current number with the factorial of the previous number until reaching 1.

• Example for calculating the height of a binary tree: def height(node): if n...read more

Yes, I am familiar with the mapping process.

• Mapping process involves creating a visual representation of data relationships.

• It helps in understanding how different data points are connected or related to each other.

• Examples include creating entity-relationship diagrams, process flowcharts, or geographic maps.

Storage classes in C specify the scope and lifetime of variables.

• Storage classes include auto, register, static, and extern.

• Auto variables are local to a block and have automatic storage duration.

• Register variables are stored in CPU registers for faster access.

• Static variables retain their value between function calls.

• Extern variables are declared in one file and can be used in another file.

Meschina learning is a type of machine learning algorithm that focuses on predicting outcomes based on historical data.

• Meschina learning uses historical data to make predictions about future outcomes.

• It is a subset of machine learning that focuses on pattern recognition and predictive modeling.

• Examples include regression analysis, decision trees, and neural networks.

A structure program is a program that uses structures to group related data together.

• Structures in C programming allow you to group related data together under one name.

• You can define a structure using the 'struct' keyword.

• Structures can contain different data types, including int, float, char, and even other structures.

• You can access the members of a structure using the dot operator.

• Example: struct employee { int id; char name[20]; float salary; };

• Example: struct employee em...read more

Python supports Object-Oriented Programming (OOP) concepts like classes, objects, inheritance, encapsulation, and polymorphism.

• Python supports classes and objects for creating reusable code.

• Inheritance allows a class to inherit attributes and methods from another class.

• Encapsulation restricts access to certain components of an object.

• Polymorphism allows objects to be treated as instances of their parent class.

• Example: class Animal: def __init__(self, name): self.name = name c...read more