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Q10) Explain Probability mass function ?
A10) If a stochastic variable can take I different values, x(i)={ 1,2,3...............i) and the probability of the value x(i) being taken is p(x(i)), the set of nos p(x(i)) is said to be a probabilty mass function.

The Probability mass function may be a known set of nos. Eg with a die, the probability of each of the six faces is 1/6.

Q11) Compare Simulation & analytical Methods ?
A11) Compared with analytical solution of problems the main drawback of simulation is apparent. It gives specific solutions rather those general solutions. In the study of automobile wheel motion, eg, an analytical solution gives all the conditions that can cause oscillation. To try to find all such conditions requires that the simulation be repeated under many different conditions. The mathematical solution being sought is some maximizing conditions.
 

Q12) What Does GPSS stands for?
A12) GPSS stand for General Purpose Simulation System Language. It is Developed by IBM corporation. The system to be simulated in GPSS is described as a block diagram in which the block diagram in which the block diagram in which the block represent the activities & lines joining the blocks indicate the sequence in Which the activities can be executed.

Q13) What is Discrete event simulation?
A12) A no used to represent some aspect of the system state is called a state descriptor. We define a discrete event as a set of circumstances, that causes an instantaneous change in one or more system state descriptors. In addition , it is possible that two different events occur simultaneously, or are modeled as being simultaneous, so that not all changes of state descriptors occurring simultaneously necessarily belong to a single event.

Q14) What are block types available in GPSS ?
A14) Various types of Block types are:
1) Advance 2) Link 3) Seize 4) Assign 5) Logic 6) Tabulate 7) Depart 8) Mark 9) Terminate 10) Enter 11) Priority 12) Test

Q15) What are Action Times?
A15) Clock time is represented by an integral no, with the interval of real time corresponding to a unit of time chosen by the program user. The Unit of time is not specifically stated but is implied by giving all times in terms of the same unit. One block type called ADVANCE is concerned with representing the expenditure of time. The program computes an interval of time called an action time for each transaction as it enters an advance block, & the transaction remains at the block for this interval of simulated time before attempting to proceed.

Q16) Define Facilities & Storage?
A16) A facility is defined as an entity that can be engaged by a single transaction at a time. A storage is defined as an entity that can be occupied by many transactions at a time, up to some predetermined limit. Both Facilities & storage can be made unavailable, as would occur if the equipment they represent breaks down,& can be made available again, as occurs when a repair has been made.

Q17) Name various fields in which simulation system is a great aid?
A17) 1) Training of Pilots 2) Telephone Systems 3) Inventory Systems 4) Electronic circuits
 

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