Hetro lab Production in Reacter Operator Interview Questions and Answers

Hydraulic systems and hydraulic machines.

Q1. What is the difference between BS4 and BS6 emissions standards?
Ans. 
BS6 emissions standards are more stringent than BS4, with lower limits on emissions of pollutants like nitrogen oxides and particulate matter.
• BS6 standards have stricter limits on emissions of pollutants like nitrogen oxides (NOx) and particulate matter (PM) compared to BS4.

• BS6 compliant vehicles are required to have advanced emission control technologies like selective catalytic reduction (SCR) and diesel particulate ...read more
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Q2. What is the difference between an electric motor and an electric generator?
Ans. 
An electric motor converts electrical energy into mechanical energy to produce motion, while an electric generator converts mechanical energy into electrical energy.
• Electric motor converts electrical energy into mechanical energy

• Electric generator converts mechanical energy into electrical energy

• Electric motor is used in appliances like fans, washing machines

• Electric generator is used in power plants to generate electr
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Q3. Difference between four stroke and two stroke engine
Ans. 
Four stroke engines have separate intake, compression, power, and exhaust strokes, while two stroke engines combine intake and compression in one stroke and power and exhaust in another.
• Four stroke engines have a dedicated stroke for each of the four processes: intake, compression, power, and exhaust

• Two stroke engines combine intake and compression in one stroke and power and exhaust in another

• Four stroke engines are m...read more
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Q1. Explain Virtual DOM, Key Features of React, Hooks in React, create a todo app in react
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, React key features include component-based architecture, declarative syntax, and virtual DOM, React Hooks are functions that let you use state and other React features without writing a class.
• Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by updating only the necessary parts of the DOM.

• Key features of React include componen...read more
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Q2. Javascript Questions- Closures,promises,Async/await,setTimeOut, write acode to reverse a string
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Q1. Self Introduction, some situation based questions
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Q2. Basic HR regular questions
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Q1. React basic,event loop, Lazy Loading, Suspense, Javascript basics
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Q2. Create counter application
Ans. 
Counter application using Reactjs
• Create a React component for the counter

• Use state to keep track of the count

• Implement functions to increment and decrement the count

• Display the count on the screen
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Q1. What are the advantages of React
Ans. 
React offers advantages such as virtual DOM for improved performance, reusable components, and easy integration with other libraries.
• Virtual DOM for efficient updates and improved performance

• Reusable components for easier development and maintenance

• Easy integration with other libraries like Redux for state management

• Support for server-side rendering for better SEO performance
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Q2. How the performance optimization can be done in React Js Application
Ans. 
Performance optimization in React Js can be achieved through code splitting, memoization, virtualization, and minimizing re-renders.
• Implement code splitting to load only necessary components when needed

• Use memoization techniques like useMemo and useCallback to prevent unnecessary re-renders

• Implement virtualization for long lists or tables to render only visible items

• Minimize re-renders by using shouldComponentUpdate or
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Q3. What is the purpose of useMemo and UseCallBack hook
Ans. 
useMemo and useCallback are hooks in React used for optimizing performance by memoizing values and functions respectively.
• useMemo is used to memoize the result of a function so that it is only recomputed when its dependencies change.

• useCallback is used to memoize a function instance so that it is not recreated on every render unless its dependencies change.

• Both hooks help in optimizing performance by preventing unneces...read more
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Basic problem on maths can be solve

Nice went normal daily problem

Q1. Why do you want to join company
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Q2. Biggest challenge
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Q1. What is prop drilling
Ans. 
Prop drilling is the process of passing props down multiple levels of nested components in React.
• Prop drilling occurs when a prop needs to be passed through multiple levels of components that do not need the prop themselves.

• It can lead to unnecessary passing of props through intermediate components, making the code harder to maintain.

• To avoid prop drilling, you can use Context API, Redux, or React's useContext and useR...read more
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Q2. What is hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q1. Explain useContext hook
Ans. 
useContext hook allows components to access data from a context without passing props down manually
• useContext hook is used to consume a context created by React.createContext

• It takes the context object as an argument and returns the current context value for that context

• It allows components to subscribe to context changes and re-render when the context value changes
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Q1. What is client side and server side rendering
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