Signify Firmware Engineer Interview Questions and Answers

Q1. Difference between structure and union
Ans. 
Structure is a collection of different data types under one name, while union is a single memory location that can hold different data types at different times.
• Structure allows each member to have its own memory location, while union shares a single memory location for all members.

• In a structure, all members can be accessed simultaneously, while in a union, only one member can be accessed at a time.

• Example: struct Pers...read more
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Q2. What is structure padding and how to pack a structure
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Structure padding is adding empty bytes to align data in memory. Packing a structure removes padding to save memory.
• Structure padding ensures that data members are aligned to memory boundaries for efficient access

• Padding bytes are added between data members to ensure alignment

• Packing a structure removes padding to save memory but may impact performance

• Example: struct example { char a; int b; } - sizeof(struct example)
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Q3. How to check stack overflow
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To check for stack overflow, monitor stack usage and set a limit to trigger an alert if exceeded.
• Monitor stack usage by tracking the stack pointer and comparing it to the stack size.

• Set a limit for stack usage and trigger an alert if the limit is exceeded.

• Use tools like stack analyzers or profilers to detect stack overflow.

• Implement stack canaries or guard zones to detect stack corruption.
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Q1. Difference between semafore and mutex
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A semaphore is a signaling mechanism while a mutex is a locking mechanism used to control access to shared resources in multithreaded environments.
• Semaphore is used to control access to a pool of resources, while mutex is used to control access to a single resource.

• Semaphores can be used to allow multiple threads to access a shared resource simultaneously, while mutex allows only one thread to access the resource at a ...read more
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Q2. How to set the priority of a task
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Task priority can be set using priority levels or scheduling algorithms in firmware development.
• Use priority levels to assign importance to tasks

• Higher priority tasks are executed before lower priority tasks

• Implement scheduling algorithms like preemptive scheduling or round-robin scheduling to manage task priorities
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Q1. Why you want to join philips
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Q1. Related embedded systems and manual testing
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Q1. Asked about my previous work experience
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Q2. About my last project in detailed
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Q1. About my personal information and related to carrier goal
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Q2. About the expectation of compensation
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Basics of c, c++, python languages
Any one os environment

Q1. Not yet done.,...,......
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Q2. .. Not yet done.........
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Q1. Tell me about yourself
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Q1. What do you know about HDD?
Ans. 
HDD stands for Hard Disk Drive, a data storage device used in computers to store and retrieve digital information.
• HDDs use magnetic storage to store data on spinning disks called platters.

• They have read/write heads that move across the platters to access and modify data.

• HDDs are typically used for long-term storage of large amounts of data in desktops, laptops, servers, and other devices.

• Examples of HDD manufacturers i
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Q1. Based on 8051 Microcontroller
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Q2. Tell me about yourself
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