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Simulation And Modelling (Cisy 403) (Bbit 417) 2Nd Trimester 2014 Question Paper
Simulation And Modelling (Cisy 403) (Bbit 417) 2Nd Trimester 2014
Course:Bachelor Of Business Information Technology
Institution: Kenya Methodist University question papers
Exam Year:2014
SIMULATION AND MODELLING (CISY 403) (BBIT 417) 2ND TRIMESTER 2014
KENYA METHODIST UNIVERSITY
END OF 2'ND 'TRIMESTER 2014 (DAY) EXAMINATION
FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : COMPUTER SCIENCE AND BUSINESS
INFORMATION
UNIT CODE : CISY 403/BBIT 417
UNIT TITLE : SIMULATION AND MODELLING
TIME : 2 HOURS
Instructions: Answer question one and any other two.
Question One
Describe the term computer simulation.
(2mks)
List down the main advantages of simulation and modeling. (2mks)
Discuss in detail Monte Carol method in simulation.
(2mks)
Using suitable flowchart show the main process of simulation. (4mks)
Explain the main advantages of using simulation.
(3mks)
Given the following process in a simulation experiment. Illustrate with a suitable Gantt chart and calculate the average waiting time by using
FCFS approach.
(4mks)
SJCF
(4mks)
Process Duration
P1 6
P2 8
P3 10
P4 12
List down any four application of simulation.
(4mks)
Differentiate between physical and mathematical model. (5mks)
Question Two
Why is probability theory of interest to performance modeling of information systems.
(2mks)
Explain the main features of a typical system and show the main components of a system.
(4mks)
Describe the main dangers of simulation and when simulation is not applicable.
(5mks)
Define the term dynamic simulation
(2mks)
Differentiate between a patient and impatient customer giving relevant examples.
(4mks)
List down the three main issue that determine the length of the queue.
(3mks)
Question Three
Explain with suitable diagrams the following queuing models
The single-server queue
Single server –serve queues
Several (parallel) servers-single queue
Several servers –several queues
Consider a disk drive that can complete an average request in 5ms the time to complete a request is exponentially distributed. Over a period of 30 minutes 200,000 requests were made to the disk.
How long did it have to complete the average request. (3mks)
What is the average number of queued requests?
(3mks)
Explain the following types of simulation types
Continuous
Discrete
Hybrid
Question Four
Clearly show the serve facilities and arriving customers in the following situation of the queue analysis.
(6mks)
Calls of a police room
A supermarket
Parking lot.
Consider a LAN with COD personal computer sand a server that maintains a common database for a query application. The average time for the serves to respond to query is 0.6 second is and the standard deviation is estimated to equal the mean. At peak times, the query rate over the LAN reaches 20 queries per minute. We would like to answer the following questions.
What is the average response time ignoring line overhead? (2mks)
If a 1.5 second response time is considered the maximum acceptable, what percent growth in manage load can occur before the maximum is reached.
(2mks)
Explain how the simulation can be used in the above.
(2mks)
Why do we build models as opposed to experiment on actual systems?
(4mks)
What is performance.
(2mks)
Define what a static model is.
(2mks)
Question Five
Explain the following terms as used in the queue
System
Random variable
Arrival rate
Queuing theory
(4mks)
Explain the following interesting observation of human behavior in queues.
Balking
Reneging
Jockeying.
(3mks)
A bank with five tellers opens its doors at 9.00 am and closes its doors at 5 pm, but operates until all the customers in the line by 5 pm have been served. Each teller has a separate queue. An arising customer joins the shortest line. If two queues have the same length the customer joins the left most queue (the one closest to the door) when a customer as the end of a line notices a departure that makes another line shorter than the customer’s present one, the customer can change to the sorter line. The bank’s management tis concerned about the quality of service currently provided to customers and is thinking of adding one or more new tellers
How many teller should they add.
(3mks)
Why is simulation necessary?
(3mks)
Represent the above scenario in a diagram, clearly naming all the main components.
(4mks)
List down any two examples of a system.
(3mks)
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