*WAITING LINE (QUEUING) T/F _01. If we are studying the arrival of automobiles a
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Question
*WAITING LINE (QUEUING)
T/F
_01. If we are studying the arrival of automobiles at a highway toll station, we can assume an infinite calling population.
_02. A bank with a single queue to move customers to several tellers is an example of a single-channel system.
03. An M/M/2 model has Poisson arrivals normal service times and two channels.
04. Frequently in queuing problems, the number of arrivals per unit of time can be estimated by a probability distribution known as the Poisson distribution. )
05. Balking customers are those who enter the queue but then become impatient and leave without completing the transaction.
06. All single-server queuing models require the utilization factor to be less than 1.
Multiple Choice
_07. Queuing discipline refers to the
(a) reason waiting occurs in underloaded systems. (b) willingness of customers to wait in line
(c) order in which customers are processed (d) all of the above
_08. A single server queuing system has average time between arrivals of 20 minutes and a service time of 10 minutes each. Assuming Poisson arrivals and exponential service times, the utilization factor is approximately (a) 0.25 (b) 0.33 (C) 0.50 (d) 0.67 (e) 0.20
_09. What happens to the customer waiting time if system utilization increases?
(a) decreases exponentially (b) decreases proportionally
(c) increases proportionally (d) increases exponentially
10. What is not considered a measure of system performance in a queuing analysis?
(a) average number in the system
(b) system utilization
(c) average number waiting in line
(d) service time
(e) all of the above
(a) average number in the system
(b) system utilization
(c) average number waiting in line
(d) service time
(e) all of the above
Explanation / Answer
1. True, because: The calling population is the sourse the customers to the queuing system. In this case, it is infinite because there is no restriction on number of customers.
2. True, because single channe system: A service system with one waiting loine but with several servers.
3. False: because M/M/2 : arrivals accoding to Poisson Process and service times have exponential distribution, but here it is written as normal, which is wrong.
4.True, because the customers arrive with Poisson Process.
5. True, balling customers are defined in this way.
6. True, because Utilization factor = percentage of the time that all servers are busy and it is < 1.
7.(c) bacause Queuing discipline represents the way the queue is organized.
SINCE THE NUMBER OF QUESTIONS IS LARGE, ONLY FIRST 7 QUESTIONS ARE ANSWERED AS PER DIRECTIONS FOR ANSWERING.
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