1500+ System Engineer Interview Questions and Answers

RAM is volatile memory used for temporary storage while ROM is non-volatile memory used for permanent storage.

• RAM stands for Random Access Memory while ROM stands for Read Only Memory.

• RAM is used for temporary storage of data and program instructions while ROM is used for permanent storage of data and program instructions.

• RAM is volatile memory which means it loses its contents when power is turned off while ROM is non-volatile memory which means it retains its contents even ...read more

I am passionate about technology and have always been interested in IT. I believe my skills and experience can be better utilized in the IT industry.

• I have always had a strong interest in technology and IT

• I enjoy problem-solving and working with computers

• I believe my skills and experience align well with the demands of the IT industry

Encapsulation and polymorphism examples, class types, and requirements for good code.

• Encapsulation: hiding implementation details, e.g. private variables in a class

• Polymorphism: using a single interface to represent multiple types, e.g. method overloading

• Class types: abstract, final, static, inner, anonymous, etc.

• Requirements for good code: readability, maintainability, efficiency, scalability, etc.

The S7 controller offers high performance and flexibility but can be complex to program and expensive.

• Advantages: high performance, flexibility, scalability

• Disadvantages: complexity in programming, expensive

• Example: S7-1200 offers fast processing speeds and can be easily expanded with additional modules

• Example: Programming for S7 controllers may require specialized training and expertise

SDLC focuses on the development of software, while STLC focuses on the testing of software.

• SDLC involves planning, designing, coding, and deployment of software.

• STLC involves test planning, test case development, test execution, and defect tracking.

• SDLC is more focused on the overall software development process, while STLC is more focused on ensuring the quality of the software.

• SDLC is a broader process that includes STLC as one of its phases.

• Example: In SDLC, a software tea...read more

DELETE removes specific rows from a table, while TRUNCATE removes all rows and resets auto-increment values.

• DELETE is a DML command, while TRUNCATE is a DDL command.

• DELETE can be rolled back, while TRUNCATE cannot be rolled back.

• DELETE triggers ON DELETE triggers, while TRUNCATE does not trigger any triggers.

• DELETE is slower as it maintains logs, while TRUNCATE is faster as it does not maintain logs.

Machine learning can ease human life by automating tasks, improving healthcare, and enhancing personalization.

• Automating repetitive tasks can save time and increase efficiency

• Machine learning can improve healthcare by predicting diseases and identifying effective treatments

• Personalization can be enhanced through recommendation systems and targeted advertising

• Natural language processing can improve communication and accessibility for individuals with disabilities

Stored procedures offer advantages such as improved performance, security, and code reusability.

• Stored procedures can reduce network traffic by executing multiple SQL statements at once.

• They can also improve performance by pre-compiling SQL statements.

• Stored procedures can enhance security by allowing access to only specific procedures rather than entire tables.

• They promote code reusability by allowing multiple applications to use the same stored procedure.

• Examples include pr...read more

The types of interrupts in the Intel 8051 microcontroller include external hardware interrupts, timer interrupts, and serial communication interrupts.

• External hardware interrupts are triggered by external devices connected to the microcontroller.

• Timer interrupts are generated by the internal timers of the microcontroller.

• Serial communication interrupts occur when data is received or transmitted through the serial port.

• Each interrupt type has a specific interrupt vector addres...read more

File System in C++ is used for managing files and directories, providing functions for file input/output operations.

• C++ provides the library for file input/output operations.

• File streams can be used to read from and write to files.

• Common file operations include opening, closing, reading, and writing files.

• File streams can handle different file types such as text files and binary files.

• File system functions like file existence check, file deletion, and file renaming are avail...read more

PHP was chosen for its versatility, large community support, and ease of use.

• PHP is a widely used scripting language with a large community of developers and extensive documentation.

• It is known for its versatility and ability to integrate with various databases and web servers.

• PHP is also relatively easy to learn and has a low learning curve compared to other languages like JSP.

• While JSP may be considered more secure, PHP can still be used to build secure applications with pr...read more

BSOD stands for Blue Screen of Death. It is an error screen displayed on Windows operating systems when a system error occurs.

• BSOD is caused by hardware or software issues

• Troubleshoot by checking for recently installed hardware or software

• Check for driver updates or rollbacks

• Run system diagnostics or memory tests

• Check for overheating or hardware failures

• Collect error codes and search for solutions online

Python objects can be checked for their class using the type() function or the isinstance() function.

• Use the type() function to check the class of an object. For example, type(5) will return .

• Use the isinstance() function to check if an object belongs to a specific class. For example, isinstance(5, int) will return True.

• In Python, everything is an object, so you can check the class of any object using type() or isinstance().

Call by reference passes the memory address of a variable, while call by value passes a copy of the variable's value.

• Call by reference allows the function to modify the original variable

• Call by value does not affect the original variable

• Example: int x = 5; function(x); //call by reference modifies x

• Example: int y = 10; function(y); //call by value does not modify y

I primarily use Python for programming.

• Python is versatile and easy to read, making it great for system engineering tasks.

• I also have experience with languages like Java, C++, and Bash scripting.

• Python's extensive libraries and frameworks make it ideal for automation and scripting tasks.

Operating system is a software that manages computer hardware and software resources.

• Compiler translates high-level language code to machine code while interpreter executes code line by line.

• One byte is equal to 8 bits.

• Machine language is a low-level programming language consisting of binary code.

• Assembler converts assembly language code to machine code.

• Types of operating system include Windows, macOS, Linux, and Unix.

• Unix is a multi-user, multi-tasking operating system devel...read more

Factorial, Fibonacci series and prime number implementation.

• Factorial: Use recursion or iteration to multiply numbers from 1 to n.

• Fibonacci: Use recursion or iteration to add the previous two numbers.

• Prime number: Check if a number is divisible by any number less than itself.

Types of constructors in C++ include default constructor, parameterized constructor, copy constructor, and destructor.

• Default constructor: Constructor with no parameters.

• Parameterized constructor: Constructor with parameters.

• Copy constructor: Constructor that initializes an object using another object of the same class.

• Destructor: Special member function called when an object goes out of scope.

Drop, delete and truncate are SQL commands used to remove data from a database.

• DROP command removes a table from the database

• DELETE command removes specific rows from a table

• TRUNCATE command removes all rows from a table

• DROP and TRUNCATE are DDL commands while DELETE is a DML command

• DROP and TRUNCATE cannot be rolled back while DELETE can be rolled back

A basic program to control car temperature by turning on/off based on set limits.

• Create a variable to store current temperature

• Set a limit for turning on the temperature control

• Set a limit for turning off the temperature control

• Use conditional statements to check if temperature is above or below the limits

• Print 'Turn on' if temperature is above the limit, 'Turn off' if below

Exception handling is a way to handle errors and unexpected events in a program.

• Try block contains the code that might throw an exception

• Catch block catches the exception thrown by the try block

• Throw keyword is used to explicitly throw an exception

• Exception handling helps in preventing program crashes and provides a way to gracefully handle errors

• Example: try { //code that might throw an exception } catch (Exception e) { //code to handle the exception }

My favorite language is Java and I would rate it 9 out of 10.

• I prefer Java because of its platform independence and vast community support.

• C and C++ are also good languages but require more attention to memory management.

• Java's object-oriented approach and extensive libraries make it a versatile language.

• Example: I have developed a web application using Java Spring framework.

• Example: I have also worked on C++ projects for embedded systems.

TestNG has 8 annotations including @Test, @BeforeSuite, @AfterSuite, @BeforeTest, @AfterTest, @BeforeClass, @AfterClass, @BeforeMethod, @AfterMethod.

• 1. @Test - Marks a method as a test method.

• 2. @BeforeSuite - Executed before the Test Suite.

• 3. @AfterSuite - Executed after the Test Suite.

• 4. @BeforeTest - Executed before the Test.

• 5. @AfterTest - Executed after the Test.

• 6. @BeforeClass - Executed before the first test method in the current class.

• 7. @AfterClass - Executed after a...read more

OOPs is a programming paradigm, Cloud Computing is a model for delivering IT services, Cyber Security is the practice of protecting computer systems, SQL is a language used to manage relational databases, DBMS is a software system used to manage databases, and a coding question is a problem-solving exercise.

• OOPs - Encapsulation, Inheritance, Polymorphism, Abstraction

• Cloud Computing - Infrastructure as a Service (IaaS), Platform as a Service (PaaS), Software as a Service (SaaS...read more

C language can be used to develop various software applications.

• Operating systems like Unix, Linux, and Windows are written in C

• Database systems like MySQL and PostgreSQL are written in C

• Networking protocols like TCP/IP are implemented in C

• Graphics and game engines like OpenGL and Unity are written in C

• System utilities like compilers, debuggers, and interpreters are written in C

OOP concepts include encapsulation, inheritance, polymorphism, and abstraction. Static variables are shared among all instances of a class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class)

• Inheritance: Allowing a class to inherit properties and behavior from another class

• Polymorphism: Ability for objects to be treated as instances of their parent class

• Abstraction: Hiding the implementation details and showing only the necessary featur...read more

Interview questions for System Engineer

• Different types of databases include relational, NoSQL, graph, and document

• Components of a web app include client-side scripting, server-side scripting, and database technology

• Program life cycle of CPP includes editing, preprocessing, compiling, linking, and executing

Data structures: trees and graphs. Difference between them.

• Trees are a type of graph with a hierarchical structure

• Graphs are a collection of nodes and edges that can be connected in any way

• Trees have a single root node and each node has at most one parent

• Graphs can have multiple disconnected components

• Trees are used for hierarchical data like file systems, organization charts

• Graphs are used for modeling relationships between objects like social networks, road networks

System engineers are responsible for designing, implementing, and maintaining computer systems and networks.

• Designing and planning computer systems and networks

• Installing and configuring hardware and software components

• Monitoring system performance and troubleshooting issues

• Ensuring system security and data backup

• Collaborating with other IT professionals and stakeholders

• Documenting system configurations and processes

There are three types of operating systems: Batch Operating System, Time-Sharing Operating System, and Real-Time Operating System.

• Batch Operating System: processes similar jobs in batches, without any user interaction. Example: COBOL

• Time-Sharing Operating System: allows multiple users to access the computer simultaneously. Example: UNIX

• Real-Time Operating System: processes data as it comes in, without any delay. Example: VxWorks

DHCP stands for Dynamic Host Configuration Protocol. It is used to automatically assign IP addresses to devices on a network.

• DHCP is a network protocol that allows devices to obtain IP addresses automatically.

• It eliminates the need for manual IP address configuration.

• DHCP servers can also provide additional network configuration information, such as subnet mask and default gateway.

• DHCP leases are temporary and must be renewed periodically.

• Example: When a new device joins a ne...read more

JSP is a Java-based technology used for creating dynamic web pages. It allows embedding Java code within HTML pages.

• JSP stands for JavaServer Pages.

• It is a technology used for developing web applications.

• JSP allows embedding Java code within HTML pages.

• It provides a simplified way to create dynamic web content.

• JSP files are compiled into servlets and executed on the server.

• Advantages of JSP include easy integration with Java code, reusable components, and separation of presen...read more

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a communication system into seven layers.

• The OSI model divides the communication process into seven layers, each with its own specific functions.

• The layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer provides services to the layer above it and uses services from the layer below it.

• The model helps in understanding how dif...read more

TCS bond agreement is a contract signed by employees to work for a certain period of time with the company.

• TCS bond agreement is a legal contract between TCS and its employees.

• Employees sign the bond agreement to work for a certain period of time with the company.

• The bond period can range from 1 to 2 years depending on the role and level of the employee.

• If an employee wishes to leave the company before the bond period ends, they are required to pay a certain amount as compens...read more

Polymorphism in Java can be achieved through method overloading and method overriding.

• Method overloading: Having multiple methods in the same class with the same name but different parameters.

• Method overriding: Subclass provides a specific implementation of a method that is already provided by its superclass.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Example: Animal class with a method 'makeSound', and subclasses Dog and C...read more

I am familiar with multiple programming languages.

• I am proficient in Java and Python.

• I have experience with C++, JavaScript, and SQL.

• I am also familiar with HTML and CSS for web development.

• I am constantly learning and expanding my knowledge of new languages and technologies.

Interview questions for System Engineer position

• Project is a temporary endeavor to create a unique product or service

• Constructor is a special method used to initialize objects

• Multiple inheritance is the ability of a class to inherit properties and behavior from multiple parent classes

• Access modifier is a keyword that determines the visibility and accessibility of a class, method, or variable

A color straight through cable is a type of Ethernet cable used to connect devices in a network.

• A color straight through cable is also known as a patch cable or a straight-through cable.

• It is used to connect devices such as computers, switches, and routers in a network.

• The cable has the same pin configuration on both ends, allowing for direct device-to-device connections.

• The color coding of the cable follows the T568A or T568B standard, which ensures proper connectivity.

• If th...read more

To connect a system to a Wi-Fi network when the SSID is not showing, you can try the following steps:

• Check if the Wi-Fi network is within range and the system's Wi-Fi adapter is turned on

• Restart the system and the Wi-Fi router

• Manually enter the SSID and password in the system's Wi-Fi settings

• Ensure that the Wi-Fi network is not hidden or using a different frequency band

• Update the system's Wi-Fi drivers

• Reset the network settings on the system

• Use a Wi-Fi analyzer tool to identi...read more

DNS is a system that translates domain names into IP addresses. DHCP is a protocol that assigns IP addresses to devices on a network. SMTP uses port 25.

• DNS stands for Domain Name System

• It translates domain names (e.g., www.example.com) into IP addresses (e.g., 192.168.1.1)

• DHCP stands for Dynamic Host Configuration Protocol

• It automatically assigns IP addresses to devices on a network

• SMTP stands for Simple Mail Transfer Protocol

• It is used for sending email messages

• SMTP uses por...read more

Dangling pointer points to memory that has been deallocated, while void pointer is a pointer that has no specific data type.

• Dangling pointer occurs when a pointer points to memory that has been freed or deleted.

• Void pointer is a pointer that can point to any data type.

• Example: int *ptr = NULL; ptr = malloc(sizeof(int)); free(ptr); // ptr is now a dangling pointer

• Example: void *ptr; int num = 10; ptr = # // ptr is a void pointer pointing to an integer

Program to find all prime numbers between two given numbers.

• Take input of two numbers from user

• Loop through the range of numbers between the two given numbers

• Check if each number is prime or not

• Print all the prime numbers found

Assignments do not return a value and cannot be used in expressions.

• Assignments are used to store a value in a variable, but they do not return a value that can be used in an expression.

• Expressions are used to evaluate a value, but an assignment does not evaluate to a value.

• For example, you cannot use an assignment in a conditional statement like if(x = 5), as it will always evaluate to true.

Answering technical questions on definition, initialization, and recursion function.

• Definition is the act of declaring a variable, while initialization is the act of assigning a value to that variable.

• Recursion function is a function that calls itself until a base condition is met.

• Example of definition: int x;

• Example of initialization: int x = 5;

• Example of recursion function: int factorial(int n) { if (n == 0) return 1; else return n * factorial(n-1); }

Oops stands for Object-Oriented Programming System. The four pillars are Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Oops stands for Object-Oriented Programming System

• The four pillars are Inheritance, Encapsulation, Abstraction, and Polymorphism

• Inheritance allows a class to inherit properties and behavior from another class

• Encapsulation refers to the bundling of data with the methods that operate on that data

• Abstraction focuses on hiding the implementation detai...read more

do-while, while, and for loops are used for iteration in programming, but differ in their syntax and conditions.

• while loop checks the condition before executing the code block

• do-while loop executes the code block once before checking the condition

• for loop is used for iterating over a sequence of values

• for loop has three parts: initialization, condition, and increment/decrement

• Example: while(i < 10){...}, do{...}while(i < 10), for(i=0; i<10; i++){...}

Truncate and delete are SQL commands used to remove data from a table.

• Truncate removes all data from a table and resets the identity column

• Delete removes specific rows from a table based on a condition

• Truncate is faster than delete as it doesn't log individual row deletions

• Delete can be rolled back, but truncate cannot

• Example: TRUNCATE TABLE myTable; DELETE FROM myTable WHERE id = 1;