Zumi Solutions Embedded Software Engineer Interview Questions and Answers

Embedded c 15 question and c language programming

Q1. Basically focaus on c laguage
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Very easy, basic questions

Written test
C programming

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. Volatile keyword
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Q2. Project specific
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Q1. Salary expectations
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Q2. Reason for job change
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Q1. What are storage class
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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. Questions in Embedded C, and about microcontrollers we have worked with
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Q1. Types of error messages in CAN protocol
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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
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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
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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
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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
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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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