DataVox Interview Questions and Answers

SCR stands for Selective Catalytic Reduction. It is a technology used to reduce nitrogen oxide emissions from diesel engines.

• SCR is a process that uses a catalyst to convert nitrogen oxides (NOx) into nitrogen (N2) and water (H2O).

• It involves injecting a urea-based solution, known as diesel exhaust fluid (DEF), into the exhaust stream.

• The DEF reacts with the NOx in the presence of the catalyst, breaking it down into harmless components.

• SCR technology is commonly used in vehic...read more

A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).

• Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.

• They are made up of diodes, which allow current to flow in only one direction.

• Rectifiers can be half-wave or full-wave, depending on the number of diodes used.

• Examples of rectifiers include bridge rectifiers, vacuum tube rectifiers, and solid-state rectifiers.

Props in React are used to pass data from a parent component to a child component.

• Props are read-only and cannot be modified by the child component.

• Props are passed down the component tree.

• Props can be any type of data, such as strings, numbers, arrays, or objects.

• Example:

DOM manipulation in JavaScript involves accessing and modifying elements on a webpage.

• Use document.getElementById() to access an element by its id

• Use document.querySelector() to access an element using CSS selectors

• Use element.innerHTML to change the content of an element

• Use element.style to change the styling of an element