Quest Global Firmware Developer Interview Questions and Answers

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
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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. Why are you interested in the field of embedded software development?
Ans. 
I am fascinated by the challenge of working with low-level hardware and creating efficient, real-time systems.
• Enjoy the challenge of working with low-level hardware

• Excited about creating efficient, real-time systems

• Passionate about developing innovative solutions for embedded systems
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Q2. What is CAN protocol?
Ans. 
CAN protocol stands for Controller Area Network protocol, used for communication between microcontrollers and devices in automotive and industrial applications.
• CAN protocol is a robust and reliable communication protocol used in automotive and industrial applications.

• It allows multiple microcontrollers to communicate with each other without a host computer.

• CAN protocol uses a differential signaling scheme to reduce ele...read more
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Q1. What is binary coded decimal?
Ans. 
Binary Coded Decimal (BCD) is a way of representing decimal numbers using a binary code.
• BCD uses four bits to represent each decimal digit.

• Each decimal digit is represented by its binary equivalent.

• For example, the decimal number 25 is represented in BCD as 0010 0101.
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Q2. How keyboard mapping works in a microcontroller?
Ans. 
Keyboard mapping in a microcontroller involves assigning specific key codes to each key on the keyboard.
• Keyboard mapping is typically done using a lookup table that maps physical key presses to corresponding key codes.

• The microcontroller reads the key code when a key is pressed and sends it to the computer for processing.

• Keyboards may use different mapping standards such as ASCII or HID.

• Custom keyboard mappings can als...read more
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Q3. What is the principle of analog to digital converter?
Ans. 
An analog to digital converter converts continuous analog signals into discrete digital values.
• Converts continuous analog signals into digital values

• Utilizes sampling and quantization techniques

• Common types include successive approximation ADC and delta-sigma ADC
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Coding Questions on REGEX, Dictionaries, Strings, Unit test coding.

Embedded c 15 question and c language programming

Q1. Basically focaus on c laguage
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Asked about previous project
pointer's coding

Q1. Explain your previous project?
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Q2. Why do you prefer bosch
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Q1. What is registers in computer system
Ans. 
Registers are small, fast storage locations within the CPU used to store data temporarily during processing.
• Registers are used to store data that is being processed by the CPU.

• They are the fastest form of memory in a computer system.

• Registers are used to hold instructions, memory addresses, and data.

• Examples of registers include the program counter, accumulator, and general-purpose registers.
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Q2. What is bios in computer system
Ans. 
BIOS stands for Basic Input/Output System, a firmware used to perform hardware initialization during the booting process of a computer system.
• BIOS is a firmware that is stored on a chip on the computer's motherboard.

• It is responsible for initializing and testing hardware components during the boot process.

• BIOS provides the necessary instructions for the computer to start up and load the operating system.

• It also provide...read more
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Q3. What is the difference between RAM and ROM
Ans. 
RAM is volatile memory that stores data temporarily, while ROM is non-volatile memory that stores data permanently.
• RAM stands for Random Access Memory and is used for temporary storage of data that can be read and written to.

• ROM stands for Read-Only Memory and is used for permanent storage of data that can only be read from.

• RAM loses its data when power is turned off, while ROM retains its data even when power is off.

• E...read more
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Q4. Difference between Microprocessor and Microcontroller
Ans. 
Microprocessor is a standalone CPU while microcontroller includes CPU, memory, and peripherals on a single chip.
• Microprocessor is typically used in general-purpose computing applications, while microcontroller is used in embedded systems.

• Microprocessor requires external components like memory and peripherals, while microcontroller has them integrated on the chip.

• Examples of microprocessors include Intel Core i7, while ...read more
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Q1. What is your expected CTC
Ans. 
My expected CTC is negotiable based on the role, responsibilities, and benefits offered.
• My expected CTC is based on industry standards and my level of experience.

• I am open to discussing the compensation package during the interview process.

• I am looking for a competitive salary that reflects my skills and contributions to the team.
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Q2. Do you have previous experience
Ans. 
Yes, I have previous experience in post silicon validation.
• I have worked as a Post Silicon Validation Engineer for 3 years at XYZ company

• I have experience in developing validation test plans and executing them

• I have worked on debugging and troubleshooting silicon issues

• I have experience in using lab equipment such as oscilloscopes and logic analyzers
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Q3. Tell me about yourself
Ans. 
I am a dedicated and detail-oriented Post Silicon Validation Engineer with a strong background in testing and troubleshooting semiconductor devices.
• Experienced in developing validation plans and test cases

• Proficient in using lab equipment such as oscilloscopes and logic analyzers

• Skilled in debugging and analyzing test results to identify issues

• Familiar with programming languages like Python and C for test automation
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Q1. Types of error messages in CAN protocol
Ans. 
Types of error messages in CAN protocol
• Bit Error: Error in a single bit of the message

• Stuff Error: Error in the stuffing bits

• CRC Error: Error in the cyclic redundancy check

• Form Error: Error in the message format

• Acknowledge Error: Error in the acknowledgement of the message
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Q2. Bit arbitration and its significance
Ans. 
Bit arbitration is the process of resolving conflicts when multiple devices try to access the same bus simultaneously.
• Bit arbitration is important in multi-master systems where multiple devices can initiate data transfer.

• It ensures that only one device gains control of the bus at a time.

• Different arbitration schemes include priority-based, round-robin, and collision detection.

• For example, in a CAN bus system, the devic...read more
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Q3. Difference between normal can and extended can
Ans. 
CAN is a communication protocol used in automotive and industrial applications. Normal CAN has 11-bit identifier while Extended CAN has 29-bit identifier.
• Normal CAN has 11-bit identifier while Extended CAN has 29-bit identifier.

• Extended CAN allows for more unique identifiers, enabling more devices to communicate on the same network.

• Normal CAN has a maximum data rate of 1 Mbps while Extended CAN has a maximum data rate ...read more
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Q4. Why can bus uses 120 ohm resistance
Ans. 
120 ohm resistance is used in CAN bus to match the characteristic impedance of the transmission line.
• CAN bus is a differential signaling system that requires a balanced impedance to prevent signal reflections.

• The 120 ohm resistance matches the characteristic impedance of the transmission line, which is typically 120 ohms.

• Without the proper impedance matching, signal reflections can cause data errors and reduce the maxi...read more
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Q1. Explain diagnostic protocols
Ans. 
Diagnostic protocols are a set of rules and procedures used to identify and troubleshoot problems in a system.
• Diagnostic protocols are used in various fields such as automotive, medical, and computer networking.

• They involve a series of tests and measurements to identify the root cause of a problem.

• Diagnostic protocols can be manual or automated, depending on the complexity of the system.

• Examples of diagnostic protocols...read more
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Very easy, basic questions

Written test
C programming