10+ National Oilwell Varco Interview Questions and Answers

Automation testing has advantages like faster execution and repeatability, but also has disadvantages like high initial cost and limited scope.

• Advantages: faster execution, repeatability, increased test coverage, improved accuracy, reduced human error

• Disadvantages: high initial cost, limited scope, difficulty in testing UI and UX, need for maintenance and updates

• Example: Selenium for web automation testing, Appium for mobile automation testing

Sorting and searching are fundamental data structure algorithms used to organize and retrieve data efficiently.

• Sorting algorithms include bubble sort, insertion sort, merge sort, quicksort, and heapsort.

• Searching algorithms include linear search, binary search, and interpolation search.

• The choice of algorithm depends on the size and type of data being sorted or searched.

• Efficient sorting and searching are critical for optimizing performance in software applications.

Resolve conflicts by merging changes and resolving conflicts manually.

• Pull the latest changes from the remote branch

• Merge the changes with your local branch

• Resolve conflicts manually by editing the conflicting files

• Add and commit the changes

• Push the changes to the remote branch

Using JAVA loop iteration to split alphabet, number and symbols in a given string.

• Create three empty string arrays for alphabet, number and symbol

• Loop through each character in the given string

• Check if the character is an alphabet, number or symbol using ASCII values

• Add the character to the respective array

• Return the array of strings containing alphabet, number and symbol

Bug life cycle is the process of identifying, reporting, fixing, and verifying software bugs.

• Bug is identified by testers or users

• Bug is reported to the development team

• Development team analyzes and reproduces the bug

• Bug is assigned to a developer for fixing

• Developer fixes the bug and marks it as resolved

• Bug is retested by testers

• If bug is not fixed, it is reopened and assigned back to developer

• Once bug is fixed and verified, it is closed

Test cases will be executed in a dedicated testing environment.

• Test cases will be executed in a separate environment to avoid interference with the production environment.

• The testing environment will be set up to mimic the production environment as closely as possible.

• Test cases will be executed on multiple platforms and browsers to ensure compatibility.

• Automated testing tools will be used to execute test cases efficiently.

• Manual testing will also be performed to ensure thoro...read more

As a Senior Engineer, I lead projects and oversee day-to-day activities, ensuring timely delivery and quality output.

• Lead project planning and execution

• Collaborate with cross-functional teams

• Monitor project progress and adjust timelines as needed

• Ensure adherence to project scope, budget, and quality standards

• Provide technical guidance and mentorship to team members

• Identify and mitigate project risks

• Communicate project status and updates to stakeholders

Reverse the elements in the array of strings

• Iterate through the array and swap the elements from start to end

• Use two pointers, one at the start and one at the end, and swap the elements until they meet

• Use a temporary variable to store the element being swapped

Using parent traverse to create Xpath

• Parent traverse is used to select the parent element of the current element

• The syntax for parent traverse is '..'

• Example: To select the parent of a div element with class 'example', the Xpath would be '//div[@class='example']/..'

O(n) refers to linear time and space complexity.

• O(n) means that the time or space required by an algorithm grows linearly with the size of the input.

• It implies that the algorithm's performance is directly proportional to the input size.

• For example, if an algorithm takes 10 seconds to process 100 elements, it would take 20 seconds to process 200 elements.

• O(n) complexity is considered efficient and desirable in most cases.

Factory pattern for creating objects based on input

• Identify the need for creating objects based on input

• Create a factory class with methods for creating objects

• Use the factory class to create objects based on input

Check for loop in a linked list

• Use two pointers, one moving one node at a time and the other moving two nodes at a time

• If there is a loop, the two pointers will eventually meet

• If one of the pointers reaches the end of the list, there is no loop

Commonly used Linux commands include ls, cd, mkdir, rm, cp, mv, grep, and chmod.

• ls - list directory contents

• cd - change directory

• mkdir - make directories

• rm - remove files or directories

• cp - copy files or directories

• mv - move or rename files or directories

• grep - search for a pattern in a file

• chmod - change file permissions

A closure is a function that has access to its own scope, as well as the scope in which it was defined.

• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and asynchronous programming.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

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