Module 2 - Block Diagrams Part 2

Question 1

Three types of associations
1. Reference
2. Shared
3.

Answer 1

Composite

Question 2

what type of relationship is this ?

Answer 2

reference association

Question 3

what type of relationship is this ?

Answer 3

composite association

Question 4

what type of relationship is this ?

Answer 4

shared association

Question 5

what does a 0..1 mean in the multiplicity of the diagram for the part property ?

Answer 5

that the part is optional or the reference is removable . remember the multiplicities do not have to match and represent two different design decisions

Question 6

satellite is the _____ property

Answer 6

reference property

Question 7

ecs is the ______ property

Answer 7

part property

Question 8

what is the default multiplicity of a reference property in a composite association

Answer 8

0..1

Question 9

which element is the super type

Answer 9

star sensor

Question 10

which element is the subtype

Answer 10

star tracker

Question 11

4 design decisions expressed in generalization representation

Answer 11

1. inheritance
2. abstraction
3. substitutability
4. extensibility

you can use a generalization between same classifiers .. block - block , value type - value type .. you are legally allows to use generalization between any classifier

Question 12

inheritance - generalizations subtype will inheritance features from its _____

Answer 12

supertype

Question 13

Generalization Principle

abstraction - means anything that is true for its supertype is true for its ______

Answer 13

subtypes

a supertype represents what is common for all its subtypes

Question 14

Generalization Principle

substitutability - generalization means a subtype anywhere its _____ is required ..

note : if you dont see an element it in the diagram , it can be defined the model ..

Answer 14

supertype

Question 15

Generalization Principle

a new subtype can be added without redesigning the new client that require the supertype when a new subtype can be added at anytime without rewiring the model. supertype is updated

is _____

Answer 15

extendability

Question 16

Supplier , client , who is dependant , who is independant ?

Answer 16

supplier - independant , client is dependant “may change not a must “

Question 17

dependency is a weak relationship only use it when ..

Answer 17

as a last source for traceability

Question 18

if the requirement changes what may change ?

Answer 18

the interface and block as clients

Question 19

a dependency can be created between

Answer 19

any two named elements

Question 20

three common classifiers or element of definition that appear on BDD
1.
2.actors
3. constraint blocks

Answer 20

Value types

Question 21

an Actor types what elements of usage ?
1 __________property
2 lifeline

Answer 21

reference

Question 22

A block types what elements of usage ?

1. part property
2. reference property
3. lifeline
4. atomic flow port
5. flow property
6. object node
7. Constraint ______

Answer 22

7. constraint parameter

Question 23

A value types what element of usages ?
1. object node
2.value property
3 port property
4. Atomic flow port
5

Answer 23

constraint parameter

review the table . elements of usage vs elements of definitions

Question 24

constraint block types what element of usage ?

_________ property

Answer 24

constraint property

Question 25

flow specification types what element of usage?

Answer 25

Non atomic flow port

Question 26

signal types what three elements of usage ?

1.Atomic flow port
2. Flow property
3. Object Flow node

Question 27

interface types what element of usage ?

Answer 27

standard port

Question 28

association types what element of usage ?

Answer 28

connector

Question 29

activity types what element of usage

Answer 29

call behavior action

Question 30

state machine types what element of usage

Answer 30

call behavior action

Question 31

interaction (element of definition ) types _______behavior action

Answer 31

call

Question 32

actors define a type of structure that is outside the boundary of your system and interfaces with the system. Three examples are

1. human operator
3. inanimate object

Answer 32

external interface

Question 33

An actor cannot own any features ( structural / behavior) because

Answer 33

that’s language law for sysml .

Question 34

treat actors like white box or black boxes ?

Answer 34

black boxes . You dont care whats the external interfaces are in the the actor element of definition . if you add part property to actors this breaks the language law for sysml exposing its parts .

Question 35

** begin in the singular

Interpret the reference association . A single instance of the system operator could be connected to one or more instances of _______ at a time

Answer 35

Delsat-77 satellite

Question 36

** begin in the singular

A single instance of DelSat-77 satellite could be connected to one or more instances of ______________ at a time

Answer 36

system operator

Question 37

value type defines a numerical value or a quantity of _____

Answer 37

interest

Question 38

what kind of value type is this and why ?

Answer 38

structured value type ; because it is a composition of other value types

Question 39

what kind of value type is this and why ?

Answer 39

primitive value type ; because it represents one value type

Question 40

what kind of value type is this and why ?

Answer 40

enumeration - define literals ( options ) that a user can pick from

Question 41

list 5 predefined value types

Answer 41

1. string
2. boolean
3. real
4. complex
5. integer

Question 42

ecs - part property that is a role played internal to satellite. its owner is the classifier at the composite end ___

Answer 42

satellite

Question 43

Interpret the ttof label

Answer 43

.ttof is not a part property but a constraint property
ttof is sitting next to a constraint block so its typed by a constraint block

Question 44

what are the constraint properties

Answer 44

tos and ttof

Question 45

which diagram shows the constraint properties bounding to the constraint block

Answer 45

parametric diagram connects the two equations together. This cannot be done in a BDD

Question 46

A contraint block can be a composition of other constraint blocks

Answer 46

True

Question 47

what does * mean in the multiplicity ?

Answer 47

0..* zero or more instances

Question 48

a compositie associate from a block into itself. Does not mean the block is composed of itself. An association expresses system structure not connection between elements.

Answer 48

associations do not convey name space. They say nothing about where the elements are nested in the model .