Module 5 - Activity Diagrams Part 1

Question 1

Three kinds of behaviors in Sysml are
1. activity
2. state machines
3. __________

Answer 1

Interaction

Question 2

Three kinds of behavioral diagrams in sysml are
1. activity diagram
2.
3. state machine diagram

Answer 2

sequence diagram

Question 3

T/F Activity and activity diagrams are synonyms

Answer 3

False
activity - behavior / element of definition
activity diagram - behavioral diagrams

Question 4

T/F Is it legal to create multiple views of a model element ?

Answer 4

True
a block can have 1 or more activity nested under it

Question 5

what is the namespace of this diagram ?

Answer 5

Execute Hohmann transfer is an activity which contains all the elements

Question 6

two top level categories that an activity can own
1. Nodes
2 .

Answer 6

Edges

Question 7

Three kinds of nodes that appear in an activity diagram
1. actions node ( oval actions )
2.
3. control node ( fork node , decision node , initial node ,merge node , activity final , flow final )

Answer 7

object node ( square actions)

Question 8

Two kinds of edges that appear in an activity diagram
1. object flow ( solid arrows)
2.

Answer 8

control flow ( dashed arrows)

Question 9

two kinds of tokens that can flow through an activity

1. object tokens
   2.

Answer 9

control tokens

Question 10

object flows carry object ____
control flows carry control ____

Answer 10

tokens

Question 11

what does an object token represent ( solid arrow) ?

Answer 11

an instance of an object of going from one action going into another action

object - matter , energy or data

Question 12

object node is typed by
1. value type
2. signal
3.

Answer 12

block
object token can represent an instance of a block , value type or signal

Question 13

what is the name of the object token going into the VC action ?

Answer 13

transfer command

Question 14

what is the name of the input object token of “Generate response with invalid status” action ?

Answer 14

Boolean
when “generate command action is executed it will produce a command response

Question 15

True / False
An object token will be an instance of that type of Command response

Answer 15

True

Question 16

each object token that traverses an object flow represents an instance of a type

1. value type
2. block
   3

Answer 16

signal

Question 17

What does a control token represent ? ( dashed arrow) at execution time

Answer 17

it represents one action must come to an end in order for one action to start

a control token does not represent an object of any kind. Therefore its not typed in a node

Question 18

How many tokens will this Generate response with “Valid Command” Status action produce - look at output pins

Answer 18

two

1 command response and 1 control token

Question 19

What kind of action is this ?

Answer 19

opaque action or basic action

Question 20

An activity contains a set of ____________ contained within it

Answer 20

action

Question 21

what is the name of the execution ( behavior) being called ?
what is the action name ?

Answer 21

Action name : enter transfer orbit

Execution (behavior) name : Fire Thrusters

Question 22

When does an action start

1. the activity that owns the action is currently

Answer 22

executing

Question 23

When does an action start

2. A control token arrives on each of the incoming control

Answer 23

flows

Question 24

When does an action start

3. A suffient number of object tokens arrive on each of the incoming object flows to satisfy lower

Answer 24

mulitplicity

Question 25

three kinds of object nodes 1. basic 2. 3 .activity parameter node

Answer 25

pin note : pins and activity parameters are optional to add in the diagram.

Question 26

Basic object node appears between two

Answer 26

actions

Question 27

**activity parameter nodes** appears on the _____ of the FRAME

Answer 27

boarders Note : activity parameter represents input and output of the activity as a whole.

Question 28

T/F Object nodes act like a buffer to hold the object tokens All object nodes are elements of usage

Answer 28

True the object token stay in the object node till an action downstream requires them to move to another action

Question 29

How would you interpret this model ? each time the action ma comes to an end it produces

Answer 29

1 km object token

Question 30

what narrative is shown in this activity diagram ? each time action ma finishes executing it will produce 1 object token of type km which travels thru an object flow arriving on another action .. then the following action

Answer 30

action requires 1 token of type km a new execution of the action will start

Question 31

each time action ma finishes it will produce anywhere from 0 to 10 token flows as a batch what will happen if 2 tokens are produced ? how many executions will it this will result in two executions of the __________ action being executed because the min token required is 1 km token

Answer 31

currentOrbitRadius

Question 32

action ma can execute and produce 0 tokens 0 tokens means that the pin is

Answer 32

optional

Question 33

what does the multiplicity convey on the input pin ?

Answer 33

the action requires a min of 2 tokens to be consumed by the execution if a batch of 4 tokens arrive ,that starts 1 execution of the action

Question 34

nonstreaming behavior refers

Answer 34

to a token that emerges when an action finished execution , every time the lower bound is satisfied a execution starts the upstream action must finish before the downstream action

Question 35

streaming behavior on a pin refers to

Answer 35

the upstream action doesn't have to finish executing in order to have a token appear on the pin

Question 36

streaming input pin will be used by the current action , they would not wait for the action to

Answer 36

finish

Question 37

difference between what types a control token and object token block , value or signal types a object token what types a control token ?

Answer 37

nothing

Question 38

For each input pin all the ( upper or lower ) multiplicity must be satisfied for an action to start ?

Answer 38

lower multiplicity

Question 39

when will action ma will start executing when the control tokens arrives? object tokens arrives ?

Answer 39

the control token arrives. it does not need an object token because its multiplicity is 0

Question 40

when will action vc begin executing ?

Answer 40

it has an incoming control flow and an input pin ( default multiplicity is 1) the action vc needs 1 object token AND a control token in order to start a new execution

Question 41

when will action rs start execution ?

Answer 41

It has an input pin ( 0 multiplicity ) has no input control tokens the action rs will start executing the moment the owning activity starts executing

Question 42

a1 has no incoming edges , control flows or any input .. when will action a1 start executing

Answer 42

a1 doesn't need any control token a1 doesn't have any input pins action a1 will begin executing once the owning action is executing

Question 43

common mistake modelers make is modeling a loop wrong .. what is the design error ?

Answer 43

the orbitRadiusUpdated needs a control token to arrive from the previous action and the action that comes after the decision object node deadlock - an action that will wait on multiple tokens that will arrive

Question 44

what does the streaming output pin on action 2 convey ? it has to complete execution before

Answer 44

it produces a token going to the next action