Hubert Enviro Care Systems Technical Support Engineer Interview Questions and Answers

Q1. What is real dom and virtual dom in react
Ans. 
Real DOM is the actual representation of the HTML structure, while Virtual DOM is a lightweight copy used for efficient updates.
• Real DOM is slower as it directly manipulates the HTML structure.

• Virtual DOM is faster as it updates the lightweight copy and then syncs with the real DOM.

• React uses the Virtual DOM to minimize unnecessary re-rendering of components.

• Virtual DOM allows for efficient batch updates, improving per...read more
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There were 6 questions to be solved. 3 average and 3 tough questions.

Q1. Concepts ask in interview Java Threads Exception Collections Spring boot annotations Git
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Q1. A general conversations, regarding my experience, project.
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Q1. Process synchronisation and threads.
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Linked list and sorting. Linux system side programming.

Q1. Thread synchronisation. Locking.
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Q1. Managerial discussion. Threading and watchdog related stuff.
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Question was moderate. Good knowledge of dsa needed. CP not mandatory.

Q1. Question on oops principals, complexity analysis of programs, c++ concepts of classes, memory allocation etc.
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Q2. How much memory is allocated when a class is declared? How much when instance is created ? And so on...
Ans. 
Memory allocation for class and instance creation in Java
• Memory is allocated for class variables and methods when the class is loaded into memory

• Memory for instance variables is allocated when an instance of the class is created

• The amount of memory allocated depends on the data type and size of the variables

• Static variables are allocated memory only once, while instance variables are allocated memory for each instance

• M...read more
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Q1. What do you understand by distributed systems, multitasking multiprograming etc, overview idea of amazon working etc.
Ans. 
Distributed systems involve multiple computers working together, multitasking allows for multiple tasks to be performed simultaneously, Amazon uses distributed systems for their online services.
• Distributed systems involve multiple computers working together to achieve a common goal

• Multitasking allows for multiple tasks to be performed simultaneously by a single computer

• Multiprogramming allows multiple programs to run o...read more
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Q1. Basic hr questions like relocation, aim etc.
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Q1. About MVC Cache, MVC Session Management, Model binding, MVC Performance increasing technics, and some basic questions in C#. Simple html coding test
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Q2. In SQL Server : About indexes, functions , procedure tuning, transactions
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Q1. About achievements, behavior, weakness, client handling, professional strengths, problem soving skills
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Q1. Waht is water treatment ?
Ans. 
Water treatment is the process of removing contaminants from water to make it safe for consumption or other uses.
• Water treatment involves processes such as filtration, disinfection, and sedimentation.

• Examples of water treatment methods include chlorination, reverse osmosis, and UV treatment.

• Water treatment is essential for ensuring access to clean and safe drinking water for communities.

• Industrial water treatment is al...read more
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Q2. To know charcter of water
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Metrix problem to find the shortest order of the largest matrix in given metrix with all non-zer0's

Q1. TCP header details like information included in TCP header?
Ans. 
TCP header contains important information for reliable data transmission.
• TCP header includes source and destination port numbers

• It also includes sequence and acknowledgement numbers

• TCP header has flags for various control functions like SYN, ACK, FIN, etc.

• Window size, checksum, and urgent pointer are also included in TCP header
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Q2. IPv6 vs IPv4 comparison and advantages of IPv6
Ans. 
IPv6 offers more IP addresses, better security, and improved performance compared to IPv4.
• IPv6 uses 128-bit addresses, providing a virtually unlimited number of unique IP addresses.

• IPv6 includes built-in security features, such as IPsec, which provides end-to-end encryption and authentication.

• IPv6 also offers improved performance through features like multicast and anycast addressing.

• IPv6 simplifies network configurati...read more
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