1) Which of the following are important characteristics of hard real-time task?
solution) b) Application fails if the task produces correct results after its deadline
c) Application fails if the task produces incorrect results after its deadline
2) Which one of the following is an important characteristic of a soft real-time task?
solution) d) the utility of the result produced by a task decreases with time if the result is produced after the deadline.
3) Which of the following is an important characteristic of a firm real-time task?
solution) a) the result produced by the task is discarded if produced after deadline.
4) Which of the following tasks can be considered to be a hard real-time task?
solution) e) An online e-commerce transaction.
5) which of the following factors have resulted in a surge of embedded applications being used worldwide?
solution) a) Flexibility of application due to the internet.
b) Trend of reducing power consumption by computers.
c) Trend of reducing cost of computers
e) Increasing processing power and reliability of computers.
6) Which of the following is not true of a reactive system?
solution) b) These systems are specific to chemical reaction control system.
7) Operator queries in a nuclear power plant control system can be considered as which one of the following types of event?
solution) b) Aperiodic event.
8) A fire alarm in a chemical plant can be considered as which one of the following types of event?
solution) c) Sporadic.
9) Which one of the following is a multi rate system?
solution) d) system with multiple periodic tasks with different polling frequencies.
10) Which of the following is not true about servos used in embedded real-time systems such as robots?
solution) c) Servos are used as transducers of energy.
11) Suppose a voice signal ranges from 100 Hz to 300 Hz, for converting the analog speech signal to digital signal , what should be the minimum sampling rate according to the Nyquist criterion.
solution) d) Nyquist rate = 2* highest frequency of interest = 2*300 = 600 samples per sec.
12) Which of the following are true of a " fail-safe"state of an embedded system?
solution) a) no damage can result if the embedded system fails in this state.
d) Fail-safe state helps to separate the issues of safety and reliability.
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