KLA Interview Questions, Process, and Tips

Chart diagram from Given Test Scenario

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Round 1- 30 questions of aptitude

Q1. Draw flow diagram of Wafer Test cases
Ans. 
Flow diagram of Wafer Test cases
• Start with wafer preparation

• Perform electrical testing on each die

• Check for defects and record results

• Sort dies based on test results

• End with final wafer disposition
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Q2. Write Test cases
Ans. 
Test cases should cover various scenarios to ensure software quality.
• Test case for positive scenario

• Test case for negative scenario

• Test case for boundary value testing

• Test case for error handling

• Test case for performance testing
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Question based on the array and graph. its 1 hour test on hackerrank

Duration: 1Hour 30 Minutes, 2 Coding Questions of Total 175 Marks. 1st Question has 75 marks and 2nd Question has 100 marks.

Q1. 1. Find the smallestMissingNumber in given array using Bitwise OR operation alone 2. Based on Array data Manipulation.
Ans. 
Using Bitwise OR operation to find the smallest missing number in an array.
• Iterate through the array and perform Bitwise OR operation with each element to set corresponding bit in a bitmask

• Iterate through the bitmask to find the first unset bit, which represents the smallest missing number

• Example: Array [0, 1, 3, 4, 6] would have a bitmask of 10101, smallest missing number is 2
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Q2. Q2: Customized Data Extraction From Given Dynamic Array & Perform Some Math Operations On the Extracted Data
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Q1. Write a Pseudo code for given scenario?
Ans. 
Pseudo code for a scenario
• Define variables and data structures needed

• Write the main logic using conditional statements and loops

• Handle edge cases and error conditions

• Test the pseudo code with sample inputs
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Q1. System Design & Design Pattern based questions
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Q1. Not Applicable (Yet to be scheduled)
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Test was on hackerrank leetcode hard question

Was asked details of scanning electron microscopy