OMG OMG Certifications OMG-OCSMP-MBA400 Questions & Answers

• Question 41:

  Choose the correct answer

  What kind of models can be exchanged using XMI?

  A. only UML models including profiles

  B. only UML and SysML models

  C. instances of MOF models

  D. instances of metamodels that can be described by an XML schema

  Correct Answer: C

  The kind of models that can be exchanged using XMI are instances of MOF models. MOF (Meta-Object Facility) is a standard that defines a metamodeling architecture and a set of metamodels for creating and manipulating models. A metamodel is a model that defines the abstract syntax and semantics of another model. A model is an instance of a metamodel that conforms to its rules and constraints. XMI (XML Metadata Interchange) is a format specification that enables the interchange of objects and models through an XML formatted file. It is based on a metamodel that defines the mapping of MOF concepts to XML concepts. By using XMI, any model that is an instance of a MOF metamodel can be serialized and deserialized in terms of XML elements and attributes. This includes UML, SysML, and other modeling languages that are defined as MOF metamodels.

• Question 42:

  Choose the coned answer

  What is one of the best reasons for a modeling Systems Engineer to use OCL?

  A. OCL transforms easily into code

  B. OCL facilitates understanding by engineers.

  C. OCL can express any imaginable constraint

  D. OCL allows tor precise specification of constraints based on contents of the model

  Correct Answer: D

  OCL is a formal language that can be used to specify constraints on the elements and relationships of a model. OCL can access the properties and operations of the model elements and check their values and states. OCL is not intended to be transformed into code or to express any imaginable constraint. OCL may not be easily understood by engineers who are not familiar with its syntax and semantics. References: OMG-Certified Systems Modeling Professional - Model Builder ?Advanced (OCUP2-ADV) Examination Guide Version 1.0, Section 4.3.1

• Question 43:

  Choose the coned answer.

  A department director is responsible (or monitoring the system development processes in a large systems engineering company. In a few systems engineering projects, irritation developed recently between the specialists department's requirements analysts and the system engineering design team, although the methodology had been introduced a couple of years ago.

  How could the director resolve this conflict?

  A. Tell the teams' supervisors to encourage better teamwork, and check every other week to see how the teams have improved

  B. Let each team decide on its individual development methodology. The teams' supervisors will have to budge gaps where they occur

  C. Note if the systems engineering methodology still works with the company's business processes, and make modifications where needed D. Repeat the methodology training tor the people involved and check every other week to see if the methodology usage by the teams is improving

  Correct Answer: C

  A systems engineering methodology is a collection of related processes, methods, and tools that support the discipline of systems engineering in a specific context. A systems engineering methodology should be aligned with the company's business processes and goals, and should be updated and improved as needed to reflect changes in the environment, technology, customer needs, etc. By noting if the systems engineering methodology still works with the company's business processes, and making modifications where needed, the director canresolve the conflict between the requirements analysts and the system engineering design team by ensuring that they follow a consistent and effective approach to systems engineering

• Question 44:

  Choose the correct answer.

  How does the quality of models relate to the quality of the modeling language used to express them?

  A. Model quality benefits from the degree of syntactical and semantic formalism supported by the modeling language

  B. The modeling language must be applicable to a wide range of domains of practice in order to produce high-quality models.

  C. The level of comprehensibility of the modeling language's abstract syntax directly corresponds to the quality of the models

  D. The quality of the modeling language does not influence tin.- quality of the models because the quality of the models depends on the skill and knowledge of the modeler

  Correct Answer: A

  The quality of models relates to the quality of the modeling language used to express them in that model quality benefits from the degree of syntactical and semantic formalism supported by the modeling language. Syntactical and semantic formalism refers to the rules and meanings that define how the modeling language elements and relationships can be used and interpreted. A high degree of syntactical and semantic formalism can help improve the clarity, consistency and correctness of the models and avoid ambiguity, inconsistency and error. A high degree of syntactical and semantic formalism can also enable automated analysis, verification and validation of the models. The modeling language does not have to be applicable to a wide range of domains of practice in order to produce high-quality models, as some modeling languages may be more suitable or specialized for certain domains than others. The level of comprehensibility of the modeling language's abstract syntax does not directly correspond to the quality of the models, as abstract syntax is only one aspect of the modeling language that defines its structure and notation. The quality of the modeling language does influence the quality of the models because the quality of the models depends not only on the skill and knowledge of the modeler but also on the expressiveness and precision of the modeling language. References: OMG-Certified Systems Modeling Professional - Model Builder ?Advanced (OCUP2-ADV) Examination Guide Version 1.0, Section 4.1

• Question 45:

  Choose the correct answer.

  A control unit aboard a ship sends commands to a remote-controlled submarine. which in turn sends messages to the ship after completing each major stage of its overall mission. For each distinct stage, the ship orders the submarine to perform a different set of operations. Completing any given stage takes a widely variable amount of time

  Why it is appropriate to use the MARTE profile to model this system with SysML?

  A. The control unit is an embedded system, which the MARTE profile makes it possible to model in SysML

  B. The stage transitions of the mission equate to a logical dock, a temporal construct that MARTE brings to SysML

  C. The stage transitions of the mission equate to a chronometric clock a temporal construct that MARTE brings to SysML

  D. The control unit must order the submarine's operations in real time, which the MARTE profile makes it possible to model in SysML.

  Correct Answer: D

  It is appropriate to use the MARTE profile to model this system with SysML because the control unit must order the submarine's operations in real time, which the MARTE profile makes it possible to model in SysML. MARTE is a UML profile that provides concepts and annotations for modeling and analyzing real-time and embedded systems. It supports modeling time-related properties and constraints, such as deadlines, periods, durations, clocks, etc., as well as resource-related properties and constraints, such as memory, CPU, power, etc. By using MARTE, one can capture the real-time requirements and behavior of the system and perform schedulability and performance analysis.

• Question 46:

  Choose the correct answer.

  A team of designers led by a hardware systems engineer is finding it difficult to manage the design of a distributed air-conditioning system_ Each system component Is a complex assembly with multiple design models (such as MCAD. ECAD, and Spreadsheets). The system engineer wants to architect an approach that achieves the following

  (1)

  provides a unified view of the design of the system and Its components

  (2)

  provides a unified model for generating a bill-of-materials

  (3)

  provides sufficient semantics to propagate changes made in one design model to another

  Assume that the system engineer Is allocated resources to purchase or develop the new software required for this architecture

  Which approach would be most effective from a MBSE perspective?

  A. import each design model into a single SysML model and then create relationships between the design models

  B. import each design model into a separate SysML model, link the SysML models together, and then create relationships between the design models

  C. create a SysML block structure representing (he system and its components, and then create relationships between the blocks and the design models

  D. create a SysML package structure representing the system and its components, and then create relationships between the packages and the design models

  E. create a SysML activity structure representing the design process of each component, and then create relationships between the activity parameters and the design models

  Correct Answer: C

  This approach would be most effective from a MBSE perspective because it allows the system engineer to create a unified view of the design of the system and its components using SysML blocks and relationships. A block is an extension of the UML Class metaclass that can be used to model any system component with structure and behavior. A relationship is a connection between model elements that specifies some kind of dependency or association. By creating a SysML block structure representing the system and its components, the system engineer can capture the hierarchy, composition, classification, generalization, etc., of the system elements. By creating relationships between the blocks and the design models, such as MCAD, ECAD, or Spreadsheets, the system engineer can link the SysML model with the external models and provide traceability and consistency. The system engineer can also use the SysML model to generate a bill-ofmaterials for the system and its components, as well as to propagate changes made in one design model to another using allocation or synchronization mechanisms.

• Question 47:

  Choose the correct answer

  A stereotype is defined in a profile This stereotype has two properties whose types were already defined in the model

  What must be done to reuse their type definitions?

  A. The package defining the types needs to apply the profile.

  B. The package defining the types needs to import the profile

  C. The profile needs to apply the package where these types are defined.

  D. The profile needs to import the package where these types are defined.

  Correct Answer: D

  To reuse the type definitions of the properties of a stereotype, the profile needs to import the package where these types are defined. An import relationship indicates that the elements in one package can be referenced by another package without a qualified name. By importing the package with the types, the profile can use them as attributes of the stereotype without having to redefine them.

• Question 48:

  Choose the coned answer

  What is the best way to ensure that a shared model has consistently-represented elements and diagrams?

  A. Implementation of standard libraries

  B. modeling conventions and standards

  C. packages that map one-for-one to components

  D. domain stereotypes maintained in a configuration control system

  Correct Answer: B

  The best way to ensure that a shared model has consistently-represented elements and diagrams is to use modeling conventions and standards. Modeling conventions and standards are rules and guidelines that define how the model elements and diagrams should be named, defined, structured, formatted and documented. Modeling conventions and standards can help improve the clarity, consistency and quality of the model and facilitate the communication and collaboration among the modelers and stakeholders. Implementation of standard libraries is a good way to ensure that a shared model has reusable and interoperable elements and diagrams, but it may not ensure their consistent representation. Packages that map one-for-one to components is a good way to ensure that a shared model has modular and traceableelements and diagrams, but it may not ensure their consistent representation. Domain stereotypes maintained in a configuration control system is a good way to ensure that a shared model has customized and controlled elements and diagrams, but it may not ensure their consistent representation. References: OMG-Certified Systems Modeling Professional - Model Builder ?Advanced (OCUP2-ADV) Examination Guide Version 1.0, Section 4.1

• Question 49:

  Choose the correct answer.

  When defining a stereotype, a modeler may wish to put some constraints on the stereotype, its properties, or its relationships. What is the most suitable language to accomplish this?

  A. DSL

  B. OCL C. VSL

  D. XMI

  E. XML

  Correct Answer: B

  OCL stands for Object Constraint Language, which is a standard language for expressing constraints on UML and SysML models. Constraints are used to specify additional rules or conditions that are not directly captured by the modeling elements or their relationships. OCL can be used to define constraints on stereotypes, their properties, or their relationships in a profile.

• Question 50:

  Choose the correct answer

  The main diagram type in Modelica corresponds most closely to which SysML diagram type?

  A. act

  B. bdd

  C. ibd

  D. par

  Correct Answer: C

  The main diagram type in Modelica corresponds most closely to the ibd (internal block diagram) in SysML. An ibd shows the internal structure of a block in terms of its parts, ports, connectors, and flows. It is similar to a Modelica diagram, which shows the components of a model in terms of their connectors and equations. Both diagram types can be used to represent physical systems composed of interconnected elements with defined behaviors and properties.