HCL Infosystems System Engineer Interview Questions and Answers

Round duration - 140 minutes
This round was based on Aptitude, Verbal, logical reasoning, essay writing and 2 coding questions(easy).
This year instead of providing a separate section for quants, logical and verbal there is only one section i.e; Aptitude Section, which will include all the three-section having some questions from every section.

Q1. Aptitude Test (48 mins) Quants Verbal Logical Coding (60 mins) C C++ JAVA Python
Ans. 
Question about aptitude test and coding languages for System Engineer position.
• The question is about the aptitude test which includes quants, verbal, logical, and coding.

• The coding section includes C, C++, JAVA, and Python.

• The candidate should be familiar with all the mentioned languages.

• The time limit for the aptitude test is 48 minutes and for the coding section is 60 minutes.
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Q2. Written Communication Test (20 mins)
Ans. 
Describe the process you follow to troubleshoot a system issue.
• Identify the problem and gather information

• Analyze the data and determine possible causes

• Develop and implement a solution

• Test the solution and verify if it resolves the issue

• Document the process and solution for future reference
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Round duration - 30 minutes
This is basically an Interview round which is to know about the technical skills of the candidate.

Q1. Tell me about yourself.
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Q2. OOPs concepts with implementation
Ans. 
OOPs concepts are fundamental to software engineering. They include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a class to inherit properties and methods from a parent class.

• Polymorphism allows objects to take on multiple forms and behave differently based on the context.

• Encapsulation is the practice of hiding implementation details and exposing only necessary information.

• Abstraction is...read more
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Q3. SQL (joins, basic queries)
Ans. 
SQL joins and basic queries
• Joins are used to combine data from two or more tables based on a related column

• Basic queries include SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY clauses

• Use aliases to simplify column names and improve readability

• Avoid using SELECT * as it can slow down the query

• Use indexes to improve query performance
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Q4. Difference between list and array

Ans. 

Arrays are fixed in size and can store multiple data types, while lists are dynamic and can only store one data type.

• Arrays are declared with a fixed size, while lists can grow or shrink dynamically.

• Arrays can store multiple data types, while lists can only store one data type.

• Arrays are accessed using an index, while lists are accessed using an iterator.

• Example: int[] arr = new int[5]; List list = new ArrayList<>();

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