20+ HARSAC Interview Questions and Answers

Resources and manpower can be handled efficiently by proper planning and allocation.

• Identify the required resources and manpower for the project

• Allocate resources and manpower based on their skills and availability

• Regularly monitor the progress and adjust the allocation if necessary

• Maintain open communication with the team to ensure smooth workflow

• Implement contingency plans in case of unexpected events

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 smaller applications, while Redux is more suitable for complex...read more

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 constructors.

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 componentDidMount, componentDidUpdate, etc.

• Functional componen...read more

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

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>, <details>, <summary>, <time>, <mark>, <meter>, <progress>, <output>.

• Using semantic elements also improves accessibility ...read more

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, and update the UI based on changes in state or props.

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.

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.

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.

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: console.log(myFunc()); function myFunc() { return 'Hello!'; } // ...read more

Converter test involves testing the performance and efficiency of a converter, while DFIG (Doubly Fed Induction Generator) is a type of generator used in wind turbines.

• Converter test evaluates the performance of a power converter by analyzing its efficiency, power factor, and voltage regulation.

• DFIG is a type of generator commonly used in wind turbines to convert mechanical energy into electrical energy.

• Testing DFIG involves analyzing its control system, rotor speed, and powe...read more

A PID controller is a type of feedback control system that calculates an error value as the difference between a desired setpoint and a measured process variable.

• PID stands for Proportional-Integral-Derivative, which are the three terms used to describe the controller's actions.

• The proportional term responds to the current error value.

• The integral term responds to the accumulation of past errors.

• The derivative term responds to the rate of change of the error value.

• PID control...read more

The power curve of a Wind Energy Conversion System (WECS) shows the relationship between wind speed and power output.

• The power curve typically shows the rated power output at a certain wind speed, as well as the cut-in and cut-out speeds.

• It is important for optimizing the performance of the WECS and determining the best locations for installation.

• The shape of the power curve can vary depending on the type of wind turbine and its design.

• For example, a turbine with a higher cut...read more