Danfoss Industries Senior Hardware Engineer Interview Questions and Answers

Q1. Why do you want to change the job?
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Q2. Where do you want to see yourself in next 5 years?
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Q1. What is polymorphism in OOPS
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Polymorphism in OOPS refers to the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance allows a child class to override a method of its parent class, providing different implem
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Q2. How SQL Performance Can Be Optimized
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SQL performance can be optimized by using indexes, optimizing queries, minimizing network round trips, and using proper data types.
• Use indexes on columns frequently used in WHERE clauses to speed up data retrieval.

• Optimize queries by avoiding unnecessary joins, using WHERE clauses effectively, and limiting the number of rows returned.

• Minimize network round trips by batching multiple queries into a single request.

• Use pr...read more
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Q1. Salary Expectation as per Your Role
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My salary expectation as a Senior Software Engineer is based on industry standards, my experience, and the responsibilities of the role.
• Research industry standards for Senior Software Engineer salaries

• Consider my years of experience and expertise in software development

• Factor in the specific responsibilities and requirements of the role

• Negotiate based on the company's budget and benefits package

• Be open to discussing sa
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Q2. How will manage If you see the application is crashed
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I will investigate the root cause, analyze logs, and work on fixing the issue to prevent future crashes.
• Investigate the crash logs to identify the root cause

• Analyze the code to understand the issue

• Implement a fix for the crash

• Test the fix thoroughly before deploying it

• Implement monitoring and alerting to catch similar issues in the future
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Q1. HR reached out to me through naukri. Based on my tech stack i matched the requirements. On the first call HR asked me a lot of the questions on why i was looking out for a change, what kind of work have i ...read more
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Q1. Write a program to find last non repeating character in a given string using Java 8 functions only like Streams and Lambda's.
Ans. 
Program to find last non-repeating character in a given string using Java 8 functions only.
• Use Java 8 Streams and Lambda's to filter the string and find the last non-repeating character.

• Create a Map to store the frequency of each character in the string.

• Use the filter() method to get the non-repeating characters and find the last one using reduce().
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Q2. Given two interface, Interface A and Interface B both having the same functions in them let's say apply(). If a class implements both of these interface then which function will get implemented?
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Q3. Given a employee table with name, ID, age, salary and ratings column. Find the top 3 employee based on the ratings.
Ans. 
Find the top 3 employees based on ratings in an employee table.
• Sort the employee table based on ratings in descending order.

• Select the top 3 employees from the sorted table.

• Return the selected employees as the result.
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Q4. Group anagram coding question.
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Q5. Given an Employee class with 3 fields name, age and salary. Make changes in the class so that any two employee objects having same names are considered duplicates.
Ans. 
Modify Employee class to consider objects with same names as duplicates.
• Add a static HashSet<String> to keep track of unique names.

• Override equals() and hashCode() methods to compare names.

• In the constructor, check if the name already exists in the HashSet and mark it as duplicate if true.
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Q1. It was an algorithm question which I had to code in 30 minutes
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Q2. Java/Spring related questions were asked
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They asked me about my current project and asked me to design a system similar to that