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I applied via Naukri.com and was interviewed before May 2023. There were 3 interview rounds.
Lifecycle methods are methods that are automatically called at certain points in the lifecycle of a component in React.
Lifecycle methods include componentDidMount, componentDidUpdate, componentWillUnmount, etc.
These methods allow developers to perform actions at specific points in a component's lifecycle, such as fetching data after the component has been rendered.
They are used to manage side effects, perform cleanup, ...
React is a popular JavaScript library for building user interfaces.
Component-based architecture for reusability and easy maintenance
Virtual DOM for efficient updates and performance optimization
JSX syntax for writing HTML within JavaScript
One-way data binding for predictable data flow
Support for server-side rendering for improved SEO
Large community and ecosystem with many third-party libraries and tools
Class components are ES6 classes that extend from React.Component and have state and lifecycle methods, while functional components are simple functions that take props as input and return JSX.
Class components are defined using ES6 classes and have a render method.
Functional components are defined as simple functions that take props as input and return JSX.
Class components can have state and lifecycle methods like comp...
Higher order components are functions that take a component and return a new component with additional functionality.
Higher order components enhance the functionality of existing components
They can be used for code reusability and separation of concerns
Examples include withRouter from React Router and connect from React Redux
React hooks are functions that let you use state and other React features without writing a class.
React hooks were introduced in React 16.8.
They allow you to use state and other React features in functional components.
Some commonly used hooks are useState, useEffect, useContext, and useReducer.
Hooks are more flexible and easier to use compared to class components.
ContextAPI is a built-in feature in React for managing global state, while Redux is a separate library for state management in React applications.
ContextAPI is built into React, while Redux is a separate library.
ContextAPI is primarily used for managing global state in a React application.
Redux provides a centralized store for state management and follows a unidirectional data flow.
ContextAPI is simpler to use for smal...
Semantic elements in HTML are tags that clearly define the content they wrap, providing meaning to both browsers and developers.
Semantic elements help improve SEO by providing search engines with better understanding of the content.
Examples of semantic elements include <header>, <footer>, <article>, <section>, <nav>, <aside>, <main>, <figure>, <figcaption>, <deta...
Pseudo elements are used in CSS to style specific parts of an element.
Pseudo elements are denoted by double colons (::) in CSS.
They allow styling of specific parts of an element, like the first letter or line.
Common pseudo elements include ::before, ::after, ::first-line, and ::first-letter.
The box model is a fundamental concept in CSS that defines the layout of elements on a webpage.
The box model consists of content, padding, border, and margin.
Content: the actual content of the element, such as text or images.
Padding: space between the content and the border.
Border: a line that goes around the padding and content.
Margin: space outside the border, separating the element from other elements.
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.
Variable and function declarations are hoisted to the top of their scope.
Only declarations are hoisted, not initializations.
Function declarations take precedence over variable declarations.
Example: console.log(myVar); var myVar = 10; // Output: undefined
Example: cons...
Normal functions are defined using the function keyword, while arrow functions are defined using the => syntax.
Normal functions are hoisted, while arrow functions are not hoisted.
Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.
Arrow functions do not have their own 'arguments' object.
Arrow functions are more concise and have implicit return.
Arrow functions cannot be used as co
Splice and slice are methods used in programming to manipulate arrays.
Splice is used to add or remove elements from an array at a specific index.
Slice is used to extract a portion of an array and returns a new array.
Example of splice: array.splice(2, 0, 'new element') - adds 'new element' at index 2.
Example of slice: array.slice(1, 4) - extracts elements from index 1 to 3.
Coding questions on Java script like array methods and objects handling. coding questions on React is like life cycle methods using functional components and state management.
posted on 21 Jul 2024
posted on 14 Oct 2021
posted on 5 Oct 2023
I applied via LinkedIn and was interviewed before Nov 2020. There were 3 interview rounds.
I applied via Approached by Company and was interviewed in Jul 2023. There were 3 interview rounds.
I applied via Company Website and was interviewed in Mar 2021. There was 1 interview round.
Tube OD selection depends on factors such as fluid flow rate, pressure, and material compatibility.
Consider fluid flow rate and pressure to determine appropriate tube OD
Ensure compatibility of tube material with fluid being transported
Consult industry standards and guidelines for recommended tube OD sizes
Factor in any space constraints or installation requirements
Perform testing and analysis to verify tube OD selection
Pump selection depends on the fluid properties, flow rate, head, and system requirements.
Determine the fluid properties such as viscosity, density, and corrosiveness.
Calculate the required flow rate and head based on the system requirements.
Consider the pump type such as centrifugal, positive displacement, or axial flow.
Choose the appropriate pump size and material based on the fluid properties and system requirements.
...
Design parameters for heat exchangers include heat transfer rate, pressure drop, material selection, and flow arrangement.
Heat transfer rate: determines the efficiency of the heat exchanger
Pressure drop: affects the flow rate and energy consumption
Material selection: depends on the fluid properties and operating conditions
Flow arrangement: affects the heat transfer rate and pressure drop
I appeared for an interview before Feb 2024.
Types of welding include MIG, TIG, stick, and flux-cored welding.
MIG welding (Metal Inert Gas) uses a wire electrode and shielding gas to join metal.
TIG welding (Tungsten Inert Gas) uses a tungsten electrode and filler rod with shielding gas.
Stick welding (Shielded Metal Arc Welding) uses a flux-coated electrode to create the weld.
Flux-cored welding uses a tubular wire electrode with flux inside to shield the weld.
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