L&T Technology Services Post Silicon Validation Engineer Interview Questions and Answers

Q1. Network theory (R, L, C, filter, circuit behavior), analog electronics (Opamp, BJT), Oscilloscope (how to use to measure parameters),
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Q1. Current ctc, expected ctc. Also, about career path journey. why you left your last job or previous job?
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Q1. Three people will take the interview, one by one. They also ask some basic circuit questions and experience. Prepare your resume well. They will pick some keywords from your resume and frame questions abou...read more
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Q1. What are storage class
Ans. 
Storage classes in C specify the scope and lifetime of variables.
• Storage classes include auto, register, static, and extern.

• Auto variables are local to a block and have automatic storage duration.

• 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 file.
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Q2. Explain structure program
Ans. 
A structure program is a program that uses structures to group related data together.
• Structures in C programming allow you to group related data together under one name.

• You can define a structure using the 'struct' keyword.

• Structures can contain different data types, including int, float, char, and even other structures.

• You can access the members of a structure using the dot operator.

• Example: struct employee { int id; ...read more
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Q1. Mainly focused on basics of c language Stack program
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Q2. Compilation stages , function
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Q1. They generally asked about basic C question in pointers,function pointers,callback function
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Q2. Write a program on finding little or big endian,no of bits set in bit magic,
Ans. 
Program to find endianness and number of bits set in bit magic.
• Use bitwise operators to check endianness

• Count number of set bits using bitwise AND and right shift

• Use pre-defined functions for endianness in some programming languages

• Endianness can affect network communication and file formats
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Q3. Basic of rtos diff btw rtos and gpos core optimisation techniques used debug technique when fault occurs
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Q4. Basic IPC concepts used in operating system
Ans. 
IPC stands for Inter-Process Communication and is used for communication between processes in an operating system.
• Shared memory

• Message passing

• Pipes

• Sockets

• Remote Procedure Calls (RPC)

• Semaphores

• Mutexes
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Q1. What is que in sv ?
Ans. 
Que in SystemVerilog (SV) is a built-in data type used for creating queues.
• Queues are dynamic arrays that can grow or shrink in size during simulation.

• Queues can store elements of any data type.

• Elements can be added to the end of the queue using the built-in methods like push_back().

• Elements can be removed from the front of the queue using the built-in methods like pop_front().
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Q2. What is mailbox
Ans. 
A mailbox is a data structure used for communication between different processes or threads in a computer system.
• Mailboxes are typically used in multi-threaded or multi-processor systems to pass messages between different entities.

• They provide a way for processes to communicate without directly accessing each other's memory.

• Mailboxes can be implemented using queues, shared memory, or other mechanisms depending on the s
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Q3. What is delay inter and intera
Ans. 
Delay inter and intra refer to delays within and between different components or systems.
• Delay inter refers to delays between different components or systems.

• Delay intra refers to delays within the same component or system.

• Example: Delay inter can occur when data is transferred between a CPU and memory.

• Example: Delay intra can occur within a CPU due to processing time.
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Q4. What is constraint
Ans. 
Constraints in verification engineering are conditions or limitations imposed on the design or testbench to ensure certain properties are met.
• Constraints are used to restrict the possible values of variables or signals in a design or testbench.

• They help in verifying specific behaviors or scenarios within the design.

• Examples include setting timing constraints for signal propagation or limiting the range of input values
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Q5. What is oops related
Ans. 
Object-oriented programming concepts such as classes, objects, inheritance, encapsulation, and polymorphism.
• Classes: Blueprint for creating objects with attributes and methods.

• Objects: Instances of classes that contain data and behavior.

• Inheritance: Ability for a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism:...read more
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Given some questions and we can prefer the language

Q1. Have you worked on linux
Ans. 
Yes, I have worked on Linux for embedded software development.
• I have experience developing embedded software using Linux as the operating system.

• I have worked on customizing Linux kernels for specific embedded systems.

• I have used Linux tools and libraries for developing embedded applications.

• I have debugged and optimized software performance on Linux-based embedded systems.
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Q2. What is micro controller?
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 used in embedded systems for controlling various devices and processes.

• They are commonly found in everyday devices such as microwave ovens, washing machines, and remote controls.

• Microcontrollers are programmed using specialized software tools and lan...read more
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Q1. Self introduction
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Q2. Are you ready to relocate
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Embedded c 15 question and c language programming

Q1. Basically focaus on c laguage
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Basic c datastructucture networking l2 l3 questions

Q1. Question on projects.
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Q2. How packet goes from source to destination.
Ans. 
Packets are sent from source to destination through a series of network devices using routing protocols.
• Packet is created at the source with source and destination IP addresses.

• Packet is sent to the default gateway or router.

• Router checks its routing table to determine the next hop for the packet.

• Packet is forwarded to the next hop until it reaches the destination.

• Destination receives the packet and sends an acknowledg
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Q3. Delete a node from single linked list.
Ans. 
To delete a node from a single linked list, we need to find the node and update the pointers.
• Traverse the list to find the node to be deleted

• Update the previous node's pointer to point to the next node

• Free the memory of the node to be deleted
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Q4. Dynamic memory alocation in c
Ans. 
Dynamic memory allocation in C allows allocation of memory at runtime.
• Dynamic memory allocation is done using functions like malloc(), calloc(), realloc() and free().

• malloc() allocates memory block of specified size and returns a pointer to the first byte of allocated memory.

• calloc() allocates memory block of specified size and initializes all bits to zero.

• realloc() changes the size of previously allocated memory block...read more
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Q5. Interprocess communication in OS
Ans. 
Interprocess communication is a mechanism that allows processes to communicate with each other in an OS.
• IPC mechanisms include pipes, sockets, message queues, shared memory, and signals.

• IPC can be used for synchronization, data sharing, and coordination between processes.

• IPC can be implemented using system calls such as fork(), pipe(), socket(), and msgget().
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