300+ Assistant System Engineer Interview Questions and Answers

Python is a versatile programming language used for solving real-world problems in various fields.

• Python is used for web development, data analysis, machine learning, and artificial intelligence.

• It is used in scientific computing, finance, and gaming industries.

• Python is used for automation, scripting, and building desktop applications.

• It is also used for creating chatbots, web crawlers, and data visualization tools.

• Python's simplicity, readability, and vast libraries make it...read more

Delete command removes rows from a table, while Truncate command removes all rows from a table.

• Delete command is a DML (Data Manipulation Language) command, while Truncate command is a DDL (Data Definition Language) command.

• Delete command can be rolled back, while Truncate command cannot be rolled back.

• Delete command fires triggers, while Truncate command does not fire triggers.

• Delete command is slower as it maintains logs, while Truncate command is faster as it does not main...read more

An array is a collection of similar data types. It can be defined and values can be assigned to its indices.

• Arrays can be defined using square brackets [] and specifying the size or leaving it empty for dynamic sizing.

• Values can be assigned to array indices using the assignment operator = and specifying the index number.

• Example: int arr[5]; arr[0] = 1; arr[1] = 2; arr[2] = 3; arr[3] = 4; arr[4] = 5;

• Arrays can also be initialized during declaration like int arr[] = {1, 2, 3, 4...read more

A static variable in C is a variable that retains its value between function calls.

• Static variables are declared using the 'static' keyword.

• They are initialized only once, at the start of the program.

• Their value persists even after the function call ends.

• Static variables have a default initial value of 0.

• They are useful for maintaining state across function calls.

I am comfortable in multiple programming languages including Java, Python, and C++.

• Proficient in Java with experience in developing web applications using Spring framework

• Skilled in Python with experience in data analysis and machine learning using libraries like NumPy and Pandas

• Familiar with C++ and its object-oriented programming concepts

• Also comfortable in languages like JavaScript and SQL

Cyclically rotate an array of N integers clockwise by K.

• Create a temporary array of size K and copy the last K elements of the original array into it.

• Shift the remaining elements of the original array K positions to the right.

• Copy the elements from the temporary array to the beginning of the original array.

• Time complexity: O(N)

• Space complexity: O(K)

Swapping 2 numbers without a third variable in a program.

• Use arithmetic operations to swap the values of the variables.

• Add the values of both variables and store the result in one variable.

• Subtract the value of the second variable from the sum and store the result in the second variable.

• Subtract the value of the first variable from the sum and store the result in the first variable.

This program checks if a given string is a palindrome or not.

• A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.

• To check if a string is a palindrome, we can compare the characters from the beginning and end of the string.

• If the characters match for all positions, the string is a palindrome.

• We can ignore spaces, punctuation, and letter case while checking for palindromes.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reusability and saves time and effort in programming.

• The existing class is called the parent or base class, and the new class is called the child or derived class.

• The child class inherits all the properties and methods of the parent class and can also add its own unique properties and methods.

• Example: class Car is a paren...read more

8085 and 8086 are two different microprocessors with distinct features.

• 8085 is an 8-bit microprocessor while 8086 is a 16-bit microprocessor.

• 8085 has a maximum clock frequency of 3 MHz while 8086 has a maximum clock frequency of 10 MHz.

• 8085 has a 16-bit address bus and an 8-bit data bus while 8086 has a 20-bit address bus and a 16-bit data bus.

• 8085 has a simple architecture with fewer instructions while 8086 has a complex architecture with more instructions.

• 8085 has a lower p...read more

Query to select highest salary from employee table.

• Use SELECT statement to retrieve data from employee table.

• Use MAX function to find the highest salary.

• Combine both using the syntax: SELECT MAX(salary) FROM employee;

• Ensure that the column name is correct and matches the table schema.

Scale up and scale down operations refer to increasing or decreasing the resources allocated to a system or application.

• Scale up involves adding more resources to a system to handle increased demand or workload.

• Examples of scale up include adding more RAM, CPU, or storage to a server.

• Scale down involves reducing the resources allocated to a system when demand or workload decreases.

• Examples of scale down include removing unused resources or shutting down servers that are no lo...read more

C is a procedural programming language while C++ is an object-oriented programming language. C++ is an extension of C with additional features.

• C is a procedural programming language, while C++ is an object-oriented programming language.

• C++ supports features like classes, inheritance, polymorphism, and operator overloading which are not present in C.

• C++ is an extension of C, so C code can be easily integrated into C++ programs.

• Java is also an object-oriented programming langua...read more

Pnp and Npn transistors are types of bipolar junction transistors used in electronic circuits. Microcontroller choice depends on project requirements. Dynamic memory allocation is a method of allocating memory during runtime.

• Pnp and Npn transistors are used in electronic circuits to control the flow of current.

• Microcontroller choice depends on factors like processing power, memory requirements, and peripherals needed. For example, Arduino for simple projects, Raspberry Pi for...read more

Multiple inheritance is not possible in Java due to the Diamond Problem. The best way to achieve similar functionality is through interfaces or using composition.

• Java does not support multiple inheritance of classes to avoid the Diamond Problem

• Instead, Java supports multiple inheritance of interfaces, allowing a class to implement multiple interfaces

• Composition can also be used to achieve similar functionality by creating objects of other classes within a class

Inner join returns only the matching rows from both tables while outer join returns all rows from both tables with null values for non-matching rows.

• Inner join is used to combine rows from two tables where the join condition is met.

• Outer join is used to combine rows from two tables even if the join condition is not met.

• There are three types of outer join: left outer join, right outer join, and full outer join.

• Left outer join returns all rows from the left table and matching r...read more

Use a do-while loop to execute code and then check for condition.

• Write the code to be executed inside the do block

• After the code block, add a while loop with the condition to be checked

• The code inside the do block will always execute at least once

• Example: do { code } while (condition);

Object-Oriented Programming (OOP) in Java focuses on objects, classes, inheritance, encapsulation, and polymorphism.

• Classes and Objects: A class is a blueprint for creating objects. Example: class Car { } creates objects like Car myCar = new Car();

• Inheritance: Allows a new class to inherit properties and methods from an existing class. Example: class Dog extends Animal { }.

• Encapsulation: Bundles data (attributes) and methods (functions) into a single unit (class) and restrict...read more

C language has various operators like arithmetic, relational, logical, bitwise, assignment, and conditional operators.

• Arithmetic operators: +, -, *, /, %

• Relational operators: <, >, <=, >=, ==, !=

• Logical operators: &&, ||, !

• Bitwise operators: &, |, ^, ~, <<, >>

• Assignment operators: =, +=, -=, *=, /=, %=

• Conditional operator: ? :

I know multiple programming languages including Java, Python, and C++.

• Java

• Python

• C++

Cache memory is a small, fast memory that stores frequently accessed data for quick access.

• Cache memory is faster than main memory but smaller in size.

• It reduces the time taken to access data from main memory.

• Examples include CPU cache, web browser cache, and disk cache.

• Cache memory is volatile and can be cleared at any time.

• Cache hit is when data is found in cache, cache miss is when it's not.

Answering questions related to polymorphism, C and C++, and loops.

• Polymorphism is the ability of an object to take on many forms. C++ supports both compile-time and runtime polymorphism.

• C++ is an object-oriented language while C is a procedural language.

• A program using 6 loops can be written in various ways depending on the requirements.

• Examples of loops include for, while, do-while, range-based for, nested loops, and infinite loops.

I am comfortable with multiple programming languages including Java, Python, and C++.

• Proficient in Java with experience in developing web applications using Spring framework

• Skilled in Python for data analysis and machine learning projects

• Familiar with C++ for competitive programming and algorithm development

• Comfortable with SQL for database management

• Experience with JavaScript and HTML/CSS for front-end development

• Continuously learning and exploring new technologies and langu...read more

Local variables are declared within a function and have a limited scope, while global variables are declared outside of a function and can be accessed throughout the program.

• Local variables are only accessible within the function they are declared in.

• Global variables can be accessed from any part of the program.

• Local variables are created when a function is called and destroyed when the function ends.

• Global variables are created when the program starts and destroyed when the ...read more

Method overloading is creating multiple methods with the same name but different parameters. Method overriding is creating a new implementation of an existing method in a subclass.

• Method overloading is used to provide different ways of calling a method with different parameters.

• Method overriding is used to change the behavior of an existing method in a subclass.

• Method overloading is resolved at compile-time based on the number and type of arguments passed.

• Method overriding is...read more

OOPS in C++ stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.

• OOPS is based on the four main principles: Encapsulation, Inheritance, Polymorphism, and Abstraction.

• Encapsulation is the process of binding data and functions that manipulate the data, and keeping them together as a single unit.

• Inheritance is the process of creating a new class from an existing class, inheriting all the properties and methods of the parent ...read more

Loops are used to repeat a set of instructions. If, else and while loops are conditional statements used in programming.

• If statement is used to execute a block of code if a condition is true.

• Else statement is used to execute a block of code if the same condition is false.

• While loop is used to execute a block of code repeatedly as long as a condition is true.

• For loop is used to execute a block of code a specific number of times.

Method overriding is a feature in object-oriented programming where a subclass provides a different implementation of a method that is already defined in its superclass.

• Method overriding is used to achieve runtime polymorphism.

• The method in the subclass must have the same name, return type, and parameters as the method in the superclass.

• The @Override annotation can be used to indicate that a method is intended to override a superclass method.

• The overridden method in the subcl...read more