Software Architecture Design Mcqs

Page No. 32

Every finite automaton specification must contain which of the following?


a Descriptions of the automaton’s states in a way that allows them to be distinguished, such as by naming each one;

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bDescriptions of transitions indicating each transition source state, its target state, and the events that trigger it;

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cDesignation of an initial state, the starting place for state transitions

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dAll of the mentioned

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View Answer All of the mentioned

. Why there is a need to “Check that transitions to several concurrent sub-states go through a fork”?


aState diagrams must specify deterministic finite automata, so there can be no doubt which transition to follow under every possible circumstance

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bIt is illegal to transition directly to more than one sub-state of a concurrent composite state without going through a fork

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cAll of the mentioned

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d None of the mentioned

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View Answer It is illegal to transition directly to more than one sub-state of a concurrent composite state without going through a fork

What does “Designate an initial state in every concurrent region of a concurrent composite state” mean?


aIf there are no transitions to a concurrent composite state’s boundary, then concurrent regions do not need to have initial states

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bA transition to the composite state’s boundary could be added later, though, so initial states for each region should always be specified

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c It is legal to transition directly to more than one sub-state of a concurrent composite state without going through a fork

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dAll of the mentioned

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View Answer All of the mentioned

Which of the following are the heuristics for the State diagram?


aAvoid concurrent composite states, especially those with synch states

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bDesignate an initial state in every concurrent region of a concurrent composite state

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cCheck that transitions to several concurrent sub-states go through a fork

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d All of the mentioned

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View Answer All of the mentioned

Which of the following represents history state?


a A history state is a pseudo-state that serves as a marker indicating that the sub-state last active when the composite state was exited should be re-entered

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bThe history state indicator is a circled H

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cA history state may have a single unlabeled transition arrow emanating from it to one of its peer states

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dAll of the mentioned

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View Answer All of the mentioned

What is the Transition junction point?


aThe transitions from different sources can converge to a point and transitions leaving the point symbol may disperse to different targets

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b They are several transition arrows connected using point symbols

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cAll of the mentioned

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dNone of the mentioned

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View Answer The transitions from different sources can converge to a point and transitions leaving the point symbol may disperse to different targets

Which of the following is false about Concurrent composite states?


a Concurrent composite states simplify state diagrams by greatly reducing the number of states and transitions

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b Any set of concurrent state diagrams can be converted into an equivalent sequential state diagram, but the number of states in the sequential state diagram may be as much as the product of the number of states in each of the concurrent state diagrams

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cAll of the mentioned

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dNone of the mentioned

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View Answer None of the mentioned

What is a Synch state?


a It is a counter that keeps track of transitions

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bThey are represented in state diagrams by Synch state symbols, which are small circles containing either a positive integer or an asterisk, indicating the counter’s upper bound

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cAll of the mentioned

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dNone of the mentioned

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View Answer All of the mentioned

Which of the following are the ways to leave concurrent composite states?


a Transitioning from the composite state and transitioning from individual sub-states

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bA transition from a sub-state to an external state causes the immediate exit from each concurrent automaton’s current state

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cAll of the mentioned

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d None of the mentioned

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View Answer All of the mentioned

Which of the following are the ways to make transitions into and two ways to make transitions from concurrent composite states?


aA transition is made to the composite state boundary

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b A transition into a concurrent composite state is to make a transition directly to one of its sub-states

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cAll of the mentioned

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d None of the mentioned

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View Answer All of the mentioned

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