Emerson Electric Co. Full Stack Developer Interview Questions and Answers

Q1. Cache implementation in spring boot
Ans. 
Spring Boot provides support for caching through annotations like @Cacheable, @CacheEvict, @CachePut.
• Use @EnableCaching annotation to enable caching in Spring Boot application

• Use @Cacheable annotation to cache the result of a method

• Use @CacheEvict annotation to remove entries from the cache

• Use @CachePut annotation to update the cache without interfering with the method execution
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Q2. Few coding questions
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There are 4 coding questions in first round

Q1. Some basic statistics questions and data structure questions
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Q1. Questions on OOPS mainly inheritance Questions on Core Java Tricky questions on collections Questions on Java 8
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Q2. Questions on JavaScript What is a closure
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Round duration - 100 minutes
Round difficulty - Hard

The test had 3 parts:
1. Aptitude - 20 questions to be done in 25 minutes. (Medium level)
2. Technical MCQs - 25 questions to be done in 35 minutes. (Medium-Hard level) (HTML, JS, CSS, SQL)
3. Coding - 2 out of 3 questions to be done in 40 minutes. 20 minutes were allotted for each question. No switching between the codes was allowed. (1-easy, 2-medium in total)

Q1. Count Set Bits
You are given a positive integer ‘N’. Your task is to find the total number of ‘1’ in the binary representation of all the numbers from 1 to N.
Since the count of ‘1’ can be huge, you are ...read more
Ans. Brute Force
The key idea is to count the number of set bits in each number from 1 to n and return the sum of all set bits.
 
The algorithm will be -
 
• For each i from 1 to N -
  • We find the number of set bits for each i.
  • This can be done using a built-in function (for eg builtin_popcount in c++) or by simply using a loop and left shifting the number and finding if the last place is set or not.
• Finally we store the coun...read more
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Q2. Smallest number whose digits multiplication is ‘N’
You are given a positive integer ‘N’. The task is to find and return the smallest number, ‘M’, such that the multiplication of all the digits in ‘M’ is eq...read more
Ans. Brute force
A simple approach will be to iterate through all possible ‘M’ values, i.e., from ‘1’ to ‘2147483647’ (the largest value that a signed 32-bit integer field can hold), and check if their digit multiplication is equal to ‘N’.
 
Algorithm:
• Run a loop where ‘i’ ranges from ‘1’ to ‘2147483647’:
  • Set ‘CUR = i’. The current ‘M’ value.
  • Set ‘MUL = 1’. Use it to store the digit multiplication of ‘M’.
  • Run a loop until ‘cu...read more
Answered by CodingNinjas
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Round duration - 45 minutes
Round difficulty - Medium

It was the first face-to-face technical round. The medium was ModernHire. There was only 1 member in the interview panel. This round tested me on C fundaments, Operating System basics, and problem-solving skills.
Questions asked:
What are the TRUNCATE, DELETE and DROP statements?
What are void elements in HTML?
Define multipart form data?
1. How does the C compiler works?
2. What are deadlocks and why does it happen?
3. How to resolve deadlock?
4. What is a kernel?
5. How to dynamically allocate memory in C?
6. What is makefile?
7. What is multi-threading and why is it useful?
8. What is the need for synchronization in OS?
9. How do you run a program of 10 GB using 2 GB memory?
10. What are semaphores and mutex?
11. How is HashMap implemented?
12. Difference between linker and loader.
13. Importance of header files.
14. What is Dynamic binding?
15. What type of database should you use where transactions are involved?
16. Brief discussion on the Internship experience.

Q1. Merge Sort
Given a sequence of numbers ‘ARR’. Your task is to return a sorted sequence of ‘ARR’ in non-descending order with help of the merge sort algorithm.
Example :
Merge Sort Algorithm -

Merge sor...read more
Ans. Recursion
The basic idea is that we divide the given ‘ARR’ into two-part call them ‘leftHalves’ and ‘rightHalves’ and call the same function again with both the parts. In the end, we will get sorted ‘leftHaves’ and sorted ‘righthalves’ which we merge both of them and return a merged sorted ‘ARR’.
We implement this approach with a divide and conquer strategy.
 
Here is the algorithm : 
 
1. Divide ‘ARR’ into two-p...read more
Answered by CodingNinjas
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Round duration - 50 minutes
Round difficulty - Medium

This was a managerial cum technical round. I was asked to introduce myself (both technical details and hobbies). Then I was asked about my internship experiences and what I learnt from them. After that, he asked me questions about the projects mentioned in my resume. He tested my in-depth knowledge of the technologies that I used. He also asked me about the alternative solutions and the drawbacks of my solution.
After that, he asked me to speak about Operating Systems for 5 minutes without giving a pause. Then he asked me to speak about the OSI model and the TCP/IP model for the next 5-10 minutes again without giving a pause. He appreciated my perfomance and gave me a coding question.
What is User-defined function? What are its various types in SQL. What is an Alias in SQL?
Then he asked me whether I had any questions.

Q1. Find a Node in Linked List
You have been given a singly linked list of integers. Write a function that returns the index/position of integer data denoted by 'N' (if it exists). Return -1 otherwise.
...read more
Ans. Recursive Approach
The steps are as follows:
 
1. If the head is null, return -1 since an empty list will obviously not contain the element that we need to look for.
2. Check whether the head’s data is equal to the element we want to search. Return 0 if it is.
3. Then recurse on the next node from the head and get its answer.
4. If the answer from the recursive call is -1, your answer is also -1 since you already check the head’s d...read more
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Round duration - 15 minutes
Round difficulty - Easy

Typical HR questions were asked in this round.

Q1. Basic HR Questions
Introduce yourself.
Mention something that is not in your resume.
Why are you fit for this role?
Why HPE?
Plans for higher studies.
Ans. 
Tip 1 : Be Honest
Tip 2 : Be confident.
Tip 3 : Keep a smile always.
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Q1. Find the largest word in a list using Java Streams API
Ans. 
Find the largest word in a list using Java Streams API
• Use Java Streams API to convert the array of strings to a stream

• Use the 'max' method with a Comparator to find the largest word based on length

• Return the largest word found
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Q2. Given an array of integers, write a function that returns a list of numbers where the second digit from the left is 1
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Q3. What is a functional interface in Java
Ans. 
A functional interface in Java is an interface that contains only one abstract method.
• Functional interfaces can have multiple default or static methods, but only one abstract method.

• They are used to enable lambda expressions and method references in Java.

• Examples of functional interfaces in Java include Runnable, Callable, and ActionListener.
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Q1. Dependecy injection
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Q2. Components of dot net framework
Ans. 
The components of the .NET framework include Common Language Runtime (CLR), Base Class Library (BCL), and Framework Class Library (FCL).
• Common Language Runtime (CLR) - manages code execution and provides services such as memory management and exception handling

• Base Class Library (BCL) - provides a set of reusable classes, interfaces, and value types

• Framework Class Library (FCL) - a collection of reusable classes, inter...read more
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Q1. Basic programming language of c and Java
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Q2. Difference between python and java
Ans. 
Python is dynamically typed, interpreted language while Java is statically typed, compiled language.
• Python is easier to learn and write code quickly.

• Java is more verbose and requires more code to accomplish the same task.

• Python is better suited for scripting and rapid prototyping.

• Java is better suited for large-scale enterprise applications.

• Python has a larger community and more third-party libraries.

• Java has better pe...read more
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