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Q1) What is System? Give E.g. of One System?
A1) A System is defined as an aggregation of objects joined in some regular interaction or interdependence. E.g. of a System is Computer System in which input is given to CPU in a computer. The CPU processes the request & gives the output to the user. This is a perfect e.g. of a system.

Q2) Define Exogenous & Endogenous?
A2) The term Endogenous is used to describe activities occurring within the system & the term exogenous is used to describe activities in the environment that affect the system.

Q3) Write different models of System?
A3) 1) Physical Model
                  a) Static Model
                  b) Dynamic Model

      2) Mathematical Model
                 a) Static Model
                         a1) Numerical
                         a2) Analytical
                b) Dynamic Model
                        b1) Numerical
                        b2) Analytical

Q4) What are Continous & Discrete Systems ?
A4) Systems such as the aircraft, in which the changes are predominantly smooth, are called as continous systems. Systems like the factory, in which changes are predominantly discontinuous will be called as discrete systems. Few systems are wholly discontinous or discrete. In most systems one type of change predominates so that systems can usually be classified as being continous or discrete.

Q5) What is System Analysis?
A5) System Analysis aims to understand how an existing system or a proposed system operates. The ideal situation would be that the investigator is able to experiment with the system itself. What is actually is done to construct a model of the system & investigate the behavior of the model. The Results obtained are interpreted in terms of system performance.

Q6) What is System Design?
A6) In System Design the object is to produce a system that meets specifications. Certain system parameters or components can be selected or planned by the designer, and, conceptually, he chooses a particular combination of components to construct a system. Then its behavior is noted. If the predicted performance compares positively with the desired performance, the design is accepted otherwise system is redesigned.

Q7) Define subsystems?
A7) Subsystem is defined as a part of a system as a whole.It is customary to describe a system as consisting of interacting subsystems. Subsystem might be considered as a system consisting of subsystem at a still lower level of detail. E.g. Computer system works whole as a System but its components such as CPU, input devices etc are subsystems but work as a whole system in itself.

Q8) What are the Principals used in modeling?
A8) Various Principals used in Modeling are as follows:
1) Block -building
2) Relevance
3) Accuracy
4) Aggregation

Q9) What are Stochastic variables?
A9) When the output of system is random no then these type of variables are known as stochastic variables. More Formally, a stochastic process is defined as being an ordered set of random variables. The ordering of the set usually being with respect of time. The stochastic variable might e.g. represent the no of days in the month or a sequence of dates.
 

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