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Top Embedded Systems interview questions and answers for freshers and experienced
What is Embedded Systems ?
Questions : 1 :: What is the need for an infinite loop in Embedded systems?
Infinite Loops are those program constructs where in there is no break statement so as to get out of the loop, it just keeps looping over the statements within the block defined. Example:...View answers
Questions : 2 :: How does combination of functions reduce memory requirements in embedded systems?
The amount of code that has to be dealt with is reduced thus easing the overhead and redundancy is eliminated in case if there is anything common among the functions. Memory allocation is another...View answers
Questions : 3 :: A vast majority of High Performance Embedded systems today use RISC architecture why?
According to the instruction sets used, computers are normally classified into RISC and CISC.RISC stands for 'Reduced Instruction Set Computing' .The design philosophy of RISC architecture is such...View answers
Questions : 4 :: Why do we need virtual device drivers when we have physical device drivers?
Device drivers are basically a set of modules/routines so as to handle a device for which a direct way of communication is not possible through the user's application program and these can be...View answers
Questions : 5 :: What is the need for DMAC in ES?
Direct memory access is mainly used to overcome the disadvantages of interrupt and progam controlled I/O. DMA modules usually take the control over from the processor and perform the memory...View answers
Questions : 6 :: What is Endianness of a system and how do different systems communicate with each other?
Endianness basically refers to the ordering of the bytes within words or larger bytes of data treated as a single entity. When we consider a several bytes of data say for instance 4 bytes of...View answers
Questions : 7 :: How are macros different from inline functions?
Macros are normally used whenever a set of instructions/tasks have to be repeatedly performed. They are small programs to carryout some predefined actions. We normally use the #define directive in...View answers
Questions : 8 :: What could be the reasons for a System to have gone blank and how would you Debug it?
Possible reasons could be, - PC being overheated. - Dust having being accumulated all around. - CPU fans not working properly . - Faulty power connections. - Faulty circuit board from where the power...View answers
Questions : 9 :: Explain interrupt latency and how can we decrease it?
Interrupt latency basically refers to the time span an interrupt is generated and it being serviced by an appropriate routine defined.,usually the interrupt handler. External signals,some condition...View answers
Questions : 10 :: How to create a child process in linux?
Prototype of the function used to create a child process is pid_t fork(void); Fork is the system call that is used to create a child process. It takes no arguments and returns a value of type pid_t....View answers
Questions : 11 :: Significance of watchdog timer in Embedded Systems
Watchdog timer is basically a timing device that is set for predefined time interval and some event should occur during that time interval else the device generates a time out signal. One application...View answers
Questions : 12 :: If you buy some RTOS, what are the features you look for in ?
Deterministic operating system having guaranteed worst-case interrupt latency and context-switch times. -Documentation providing for the minimum, average, and maximum number of clock cycles required...View answers
Questions : 13 :: What are the commonly found errors in Embedded Systems?
Damage of memory devices due to transient current and static discharges. - Malfunctioning of address lines due to a short in the circuit - Malfunctioning of Data lines. - Some memory locations being...View answers
Questions : 14 :: What is the need for having multibyte data input and output buffers in case of device ports?
It’s normally the case that some devices transfer the output either in a bursty or a sequential manner and also during input entry. If we take the example of keyboards, all the data entered is...View answers
Questions : 15 :: What are the differences between analytical and computational modeling?
Analytical model allows the components to deal with the concurrency that are given during the process and the quantitative constraints that might come in between the components. Whereas,...View answers
Questions : 16 :: What are the functional requirements that are used in the embedded systems?
Functional requirements specifies the discrete and the logic to provide the services, functionality, features and the implementation that is independent from the components that are getting used in...View answers
Questions : 17 :: Why is Model transformations used in the embedded system?
Model transformations involve multiple models that are used to define different views of a system. It provides different level of granularity that it doesn’t use either the top-down approach or...View answers
Questions : 18 :: What is interaction semantics used in embedded systems?
interaction semantics allow the actions to be performed by the system components to allow it to get the global behavior. The interaction can be atomic or non-atomic dependent on the interaction...View answers
Questions : 19 :: What are the different types of system involved in embedded system?
Embedded systems are used to give the response in real time. So, it consists of the real time systems that allow the correct information to be passed to get the correct responses. For example, it...View answers
Questions : 20 :: What are the different types of Buses used by the embedded systems?
The buses are used to pass the messages between different components of the system. There are buses existing as: • Memory Bus: it is related to the processor that is connected to the memory...View answers
Questions : 21 :: What is the main function of Multiplexed Address/Data Bus?
The memory bus is used to carry the address and the data from the processor to the memory so that it can be easily accessed by the devices. These buses carry the value of the data that has to be...View answers
Questions : 22 :: How does Input/Output bus functions?
Input and output devices or functions allow the user to interact with the external files. Input and output functions are used to transfer the load on the bus. It uses the multiplexes having the input...View answers
Questions : 23 :: What is the function of simple thread poll in embedded system?
Simple thread poll allow the ready output to be passed for checking by giving it to the bus that is free and then the output is sent along the thread. The bus can send the output depending on the...View answers