L&T Technology Services Embedded Engineer Interview Questions and Answers

Normal basic apti lr conceptual questions

Q1. What is microcontroller? have you worked on any microcontroller? c++ basics polymorphism
Ans. 
A microcontroller is a small computer on a single integrated circuit that contains a processor core, memory, and programmable input/output peripherals.
• Microcontrollers are commonly used in embedded systems for controlling various devices and appliances.

• They are programmed using languages like C or assembly language.

• Examples of popular microcontrollers include Arduino, Raspberry Pi, and PIC.

• Microcontrollers are often us...read more
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Q2. Tell me about your project?
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Q3. Prime no. program?
Ans. 
A prime number program checks if a number is prime, meaning it has no divisors other than 1 and itself.
• A prime number is greater than 1 and has no divisors other than 1 and itself.

• Example: 2, 3, 5, 7, 11 are prime numbers.

• To check if a number n is prime, test divisibility from 2 to sqrt(n).

• If n is divisible by any number in this range, it is not prime.

• Edge cases: 0 and 1 are not prime; 2 is the only even prime number.
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Q1. Linux: Explain system calls. Which system calls you used? IPC: which one you used? How to start yacto project? Diff betn process and thread. Explain I2c Difference between I2c And SPI difference between s...read more
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Q2. Explain I2c diff btn i2c and spi diff btn hw and sw interrupt
Ans. 
I2C is a serial communication protocol used to connect multiple devices with two wires. SPI is another serial protocol with four wires.
• I2C uses a master-slave architecture while SPI uses a master-master architecture.

• I2C supports multiple devices on the same bus while SPI requires a separate chip select line for each device.

• Hardware interrupts are triggered by external events while software interrupts are triggered by s...read more
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Q1. Steps of compilation of a C program.
Ans. 
Compilation of a C program involves preprocessing, compiling, assembling, and linking.
• Preprocessing: Includes header files, macro expansions, and comments removal. Example: gcc -E program.c

• Compiling: Translates source code to assembly code. Example: gcc -S program.c

• Assembling: Converts assembly code to machine code. Example: gcc -c program.s

• Linking: Combines object files and libraries to generate executable. Example: g...read more
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Q2. Storage classes in C
Ans. 
Storage classes in C define the scope and lifetime of variables.
• Storage classes include auto, register, static, extern, and typedef.

• Auto variables are local to the block they are declared in.

• Register variables are stored in CPU registers for faster access.

• Static variables retain their value between function calls.

• Extern variables are declared in one file and can be used in another.

• Typedef is used to create new data typ...read more
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Q3. How does a computer boot up?
Ans. 
A computer boots up by executing the BIOS, loading the operating system into memory, and initializing hardware components.
• BIOS (Basic Input/Output System) is the first code executed by a computer when powered on.

• BIOS performs a Power-On Self Test (POST) to check hardware components.

• BIOS then locates and loads the operating system from the boot device (e.g. hard drive, SSD, USB).

• The operating system is loaded into memor...read more
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Q4. Project related questions.
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All about aptitude questions and test has multiple rounds

Asked about basic code like palindrome, string reverse