This set of Embedded Systems Multiple Choice Questions & Answers (MCQs) focuses on “Priority Inversion”.
1. Which of the following allows a lower priority task to run despite the higher priority task is active and waiting to preempt?
a) message queue
b) message passing
c) semaphore
d) priority inversion
View Answer
Explanation: The priority inversion mechanism where the lower priority task can continue to run despite there being a higher priority task active and waiting to preempt.
2. What happens to the interrupts in an interrupt service routine?
a) disable interrupt
b) enable interrupts
c) remains unchanged
d) ready state
View Answer
Explanation: In the interrupt service routine, all the other interrupts are disabled till the routine completes which can cause a problem if another interrupt is received and held pending. This can result in priority inversion.
3. Which of the following is a part of RTOS kernel?
a) memory
b) input
c) ISR
d) register
View Answer
Explanation: The ISR can send the message for the tasks and it is a part of RTOS kernel.
4. Which of the following is an industrial interconnection bus?
a) bus interface unit
b) data bus
c) address bus
d) VMEbus
View Answer
Explanation: The VMEbus is an interconnection bus which is used in the industrial control and many other real-time applications.
5. Which of the following supports seven interrupt priority level?
a) kernel
b) operating system
c) VMEbus
d) data bus
View Answer
Explanation: The VMEbus supports seven interrupt priority level which allows the prioritisation of the resources.
6. What type of interrupt handling is seen in multiprocessor applications?
a) centralised interrupt
b) handled by one MASTER
c) distributed handling
d) shared handling
View Answer
Explanation: The multiprocessor applications allows distributed handling in which the direct communication with the individual masters is possible.
7. Which of the following is an asynchronous bus?
a) VMEbus
b) timer
c) data bus
d) address bus
View Answer
Explanation: The VMEbus is based on Eurocard sizes and is asynchronous which is similar to the MC68000.
8. Which of the following is not a priority based?
a) priority inversion
b) message passing
c) fairness system
d) message queuing
View Answer
Explanation: The fairness system allows the system which requires different characteristics from those originally provided and the system response that is not a priority based. The fairness system is not a priority based on where the bus access is distributed across the requesting processors.
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