Qualcomm Design & Verification Engineer Interview Questions and Answers

You have to cut a cake maximum 3 times which should make 8 equal halves

Q1. Design an xor gate using 2:1 muz
Ans. 
An XOR gate can be designed using a 2:1 MUX by connecting the inputs to the select lines and the outputs to the data inputs.
• Connect one input of the XOR gate to the select line of the MUX

• Connect the other input of the XOR gate to the inverted select line of the MUX

• Connect the outputs of the MUX to the XOR gate's output
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Q2. Design an and gate using 2:1 mux
Ans. 
An AND gate can be designed using a 2:1 multiplexer by connecting one input to select line and the other input to the data input.
• Connect one input of the AND gate to the select line of the 2:1 mux

• Connect the other input of the AND gate to the data input of the 2:1 mux

• The output of the 2:1 mux will be the output of the AND gate
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Q1. Why should we hire you?
Ans. 
I have a strong background in design and verification engineering with a proven track record of successful projects.
• I have a solid understanding of design and verification methodologies

• I have experience working on complex projects and delivering high-quality results

• I am a quick learner and can adapt to new technologies and tools easily
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Q2. What make you better for this role
Ans. 
My strong background in design and verification, along with my problem-solving skills and attention to detail, make me a great fit for this role.
• Extensive experience in design and verification methodologies

• Proven track record of successfully completing complex projects

• Strong problem-solving skills and attention to detail

• Ability to work well in a team environment

• Familiarity with industry-standard tools and technologies
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on OOPS and OS mainly.

Q1. What are Little Endian and Big Endian in the context of computer architecture?
Ans. 
Little Endian and Big Endian refer to the order in which bytes are stored in computer memory.
• Little Endian stores the least significant byte first, while Big Endian stores the most significant byte first.

• Little Endian is commonly used in x86 architecture, while Big Endian is used in architectures like SPARC and PowerPC.

• Endianness can affect data transmission between systems with different byte orders.
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Q2. Write a program to determine if your system is little-endian or big-endian.
Ans. 
Program to determine system's endianness
• Check the endianness by storing a multi-byte integer and checking the byte order

• Use bitwise operations to extract the least significant byte

• If the least significant byte is at the lowest memory address, it's little-endian

• If the least significant byte is at the highest memory address, it's big-endian
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Q3. What is the volatile keyword in programming?
Ans. 
The volatile keyword in programming is used to indicate that a variable's value can be changed unexpectedly.
• Volatile keyword is used in multithreaded programming to prevent compiler optimizations on variables that can be changed by other threads.

• It tells the compiler not to cache the variable's value in a register, ensuring that every access is made to the variable's memory location.

• Commonly used in embedded systems pr...read more
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Q4. What is the use of a function pointer in C?
Ans. 
Function pointers in C are used to store the address of functions, allowing for dynamic function calls and callbacks.
• Function pointers can be used to implement callbacks in event-driven programming.

• They can be used to switch between different functions at runtime.

• Function pointers are commonly used in implementing data structures like function pointers in an array of function pointers.

• Example: void (*funcPtr)(int) = &a
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Q5. Design a data structure to implement multi-threading.
Ans. 
Design a data structure for multi-threading
• Use a thread-safe queue to manage tasks for each thread

• Implement a lock or semaphore to control access to shared resources

• Consider using condition variables for synchronization

• Use atomic operations for shared variables to prevent race conditions
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Q6. What does a kernel do?
Ans. 
The kernel is the core component of an operating system that manages system resources and provides a bridge between software and hardware.
• Manages system resources such as CPU, memory, and I/O devices

• Provides a bridge between software applications and hardware components

• Handles tasks such as process scheduling, memory management, and device drivers

• Controls communication between hardware and software layers
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Q7. What is a storage class in programming?
Ans. 
A storage class in programming defines the scope and lifetime of variables.
• Storage classes include auto, register, static, and extern.

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

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

• Static variables retain their value between function calls.

• Extern variables are declared outside of any function and can be accessed
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.