Nuclear Power Corporation of India Technical Support Engineer Interview Questions and Answers for Experienced

Q1. If else statement difference
Ans. 
If else statement is used to make decisions in programming based on conditions.
• If statement is used to execute a block of code if a condition is true.

• Else statement is used to execute a block of code if the same condition is false.

• Else if statement can be used to check multiple conditions.

• Example: if (condition) { // code block } else { // code block }
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Q2. Guard let statement diffrence
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Maths and reasoning basic questions

Q1. What is node js?
Ans. 
Node.js is a runtime environment that allows you to run JavaScript code outside of a web browser.
• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model.

• Node.js is commonly used for building server-side applications.

• It has a large ecosystem of open-source libraries and frameworks like Express.js.
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Q2. What is event loop?
Ans. 
Event loop is a mechanism that allows a program to efficiently handle multiple events or tasks concurrently.
• Event loop is commonly used in asynchronous programming to manage tasks that may take varying amounts of time to complete.

• It continuously checks for events or tasks in a queue and executes them one by one.

• Event loop helps prevent blocking of the main thread by allowing non-blocking execution of tasks.

• Popular exam...read more
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Q3. Difference between callback and promise?
Ans. 
Callback is a function passed as an argument to another function to be executed later, while a promise is an object representing the eventual completion or failure of an asynchronous operation.
• Callback is used in traditional asynchronous programming, while promises are used in modern asynchronous programming.

• Callbacks can lead to callback hell or pyramid of doom, while promises provide better readability and error hand...read more
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Q4. What is middlewares in node js?
Ans. 
Middlewares in Node.js are functions that have access to the request and response objects, and can modify or terminate the request-response cycle.
• Middlewares are functions that are executed in the middle of the request-response cycle.

• They can perform tasks like parsing request data, logging, authentication, etc.

• Middlewares can be added using app.use() method in Express framework.

• Example: app.use(bodyParser.json()) to p
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Q5. What is event emitter?
Ans. 
Event emitter is a pattern used to handle and respond to events in software development.
• Event emitter is a design pattern commonly used in Node.js for handling events.

• It allows objects to subscribe to events and be notified when those events occur.

• Event emitter is often used for asynchronous programming and decoupling components.

• Example: EventEmitter class in Node.js can be used to create custom events and handle them.
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Apptitude test is first round

GD is my second round

Q1. Tell me about yourself.
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Q2. Why should we hire you
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Q3. What is your family background
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Q4. Why are you looking for a change
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Q5. What are your strength and weekness
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Leetcode medium kind questions is good

Q1. Domain joining Blue screen error Outlook configuration Ticketing tools What is IM and SD What is Z-Mail About IP Some Q.about Networking Device
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Q2. How I handle irritating customer
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