Data Flow Diagram MCQ Question 8 Detailed Solution Data flow diagram (DFD) – the DFD is a set of top-down diagrams that depict all processes within a system, the data flow among the processes, and the data stores. The DFDs begin at a general level and become progressively more detailed.
What is physical DFD?
A current physical DFD depicts the current software, hardware, databases and people to carry out the activities, and new physical DFD models a new system implementation. This analysis can provide a better way to get to the actual code that fuels the requirements.
What data store in a DFD represents?
A data store in a DFD represents a repository of data. Data repository is a somewhat general term used to refer to a destination designated for data storage.
How many levels of DFD is Mcq?
Explanation: There are generally 3 level of DFD: level 0, level 1, level 2. 4. Which of the following is not a component in DFD?
What is data dictionary Mcq?
(a) Large collection of data mostly stored in a computer system.
What is physical DFD in sad?
A physical data flow diagram shows how the system will be implemented, including the hardware, software, files, and people in the system. It is developed such that the processes described in the logical data flow diagrams are implemented correctly to achieve the goal of the business.
What are the types of DFD?
There are two types of DFDs — logical and physical. Logical diagrams display the theoretical process of moving information through a system, like where the data comes from, where it goes, how it changes, and where it ends up.
What are the types of data flow?
- Simplex: In simplex mode, the communication is unidirectional, as on a one-way street.
- Half-Duplex: In half-duplex mode, each station can both transmit and receive, but not at the same time.
- Full-Duplex:
How many levels of DFD is?
Levels in DFD are numbered 0, 1, 2 or beyond. Here, we will see mainly 3 levels in the data flow diagram, which are: 0-level DFD, 1-level DFD, and 2-level DFD. 0-level DFD: It is also known as a context diagram.
What are the components of a DFD?
All data flow diagrams include four main elements: entity, process, data store and data flow.
What is DFD and its levels?
A Data Flow Diagram (DFD) is a traditional visual representation of the information flows within a system. A neat and clear DFD can depict the right amount of the system requirement graphically. It can be manual, automated, or a combination of both.
Which of the following is not found in a data flow diagram Mcq?
(c) Offline storage.
Why is a flowchart required Mcq?
Explanation: Flowcharts provide a proper documentation. It also provides systematic debugging.
Which of the following identifies data flow in motion Mcq?
Identifies data flow-data in motion. It is a pipeline through which information flows. Like the rectangle in flowcharts, Circles stand for a process that converts incoming data to information. An Open-Ended box represents a data/store-data at rest, or a temporary repository of data.
What is a Level 1 DFD?
What is a level 1 DFD? As described previously, context diagrams (level 0 DFDs) are diagrams where the whole system is represented as a single process. A level 1 DFD notates each of the main sub-processes that together form the complete system. We can think of a level 1 DFD as an “exploded view” of the context diagram.
What is a Level 0 DFD?
DFD Level 0 is also called a Context Diagram. It’s a basic overview of the whole system or process being analyzed or modeled. It’s designed to be an at-a-glance view, showing the system as a single high-level process, with its relationship to external entities.
What is context level diagram Mcq?
Explanation: Context diagram captures the various entities external to the system interacting with it and data flow occurring between the system and the external entities. Mcq Added by: admin. Software Design Software Design.
What is a view Mcq?
Solution: A VIEW is a virtual table, through which a selective portion of the data from one or more tables can be seen. A view do not contain data of their own. They are used to restrict access to the database or to hide data complexity. A view is stored as a SELECT statement in the database.
What is the relation calculus Mcq?
Relational calculus is a non -procedural query language. It is of two types: tuple and domain relational calculus. P(T) is condition to fetch the tuple T. It selects the tuple having author of book Operating system.
What is the unit of dB Mcq?
Explanation: The decibel (dB) is a logarithmic unit used to measure sound level.
What is DFD in computer?
A Data Flow Diagram (DFD) is a graphical representation of the “flow” of data through an information system (as shown on the DFD flow chart Figure 5), modeling its process aspects. Often it is a preliminary step used to create an overview of the system that can later be elaborated.
What is process in data flow diagram?
There are several ways to view these DFD components. Process. The process (function, transformation) is part of a system that transforms inputs to outputs. The symbol of a process is a circle, an oval, a rectangle or a rectangle with rounded corners (according to the type of notation).
What is Level 2 data flow diagram?
Data flow diagram (DFD): Level 2 This level two data flow diagram (DFD) template can map out information flow, visualize an entire system, and be shared with your stakeholders.
What is data flow model?
A data flow model is diagramatic representation of the flow and exchange of information within a system. Data flow models are used to graphically represent the flow of data in an information system by describing the processes involved in transferring data from input to file storage and reports generation.
What are 3 types of data flow?
Communication networks have three different types or channels known as simplex, half-duplex, and full-duplex.