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Exam 25: Waiting-Line Analysis

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Question 31

Multiple Choice

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Which of the following is not an assumption of an infinite source,multiple servers with priority queuing model?

A) Poisson arrival rates
B) Poisson service rates
C) Customers are processed in order of arrival.
D) Customers wait in a single line.
E) A unit with a low priority could conceivably wait a rather long time for processing.

F) C) and E)
G) A) and C)

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Question 32

Multiple Choice

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A bank is designing a new branch office and needs to determine how much driveway space to allow for cars waiting for drive up teller service.The drive up service will have three tellers and a single waiting line.At another branch of the bank in a similar setting,the average service time for drive up tellers is 4 minutes per customer and average arrival rate is 36 customers per hour.It is expected that the new bank will have similar characteristics. How many spaces should be provided to have a 96% probability of accommodating all of the waiting cars?

A) 10
B) 12
C) 14
D) 16
E) 18

F) None of the above
G) D) and E)

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Question 33

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In an infinite source model,the average time in line is equal to the average number of customers in line divided by the average arrival rate.

The basic multiple-server-with-priority queuing model assumes that:

A major difference between the finite and infinite source queuing models is that the customer arrival rate in a finite situation is dependent on the length of the waiting line.

In an infinite source model,the server utilization is the ratio of the average arrival rate to the service capacity.

Infinite-source queuing models assume average arrival and service rates are stable.

The most commonly used queuing models assume an arrival rate can be described by a Poisson distribution.

The following questions refer to this data for a multiple server,priority service queuing model:

A bank is designing a new branch office and needs to determine how much driveway space to allow for cars waiting for drive up teller service.The drive up service will have three tellers and a single waiting line.At another branch of the bank in a similar setting,the average service time for drive up tellers is 4 minutes per customer and average arrival rate is 36 customers per hour.It is expected that the new bank will have similar characteristics. By how much would the average time in the system increase if only two tellers were on duty?

All infinite source queuing models require the server utilization to be less than 1.0.

In a single-server system,the utilization is equal to the average arrival rate divided by the average service rate.

All of the following are constraint management options,EXCEPT:

In waiting lines,what is the term used when customers become impatient from waiting and leave the line?

If customers are homogeneous (similar needs),then separate waiting lines for each server are preferable.

A bank is designing a new branch office and needs to determine how much driveway space to allow for cars waiting for drive up teller service.The drive up service will have three tellers and a single waiting line.At another branch of the bank in a similar setting,the average service time for drive up tellers is 4 minutes per customer and average arrival rate is 36 customers per hour.It is expected that the new bank will have similar characteristics. What is the average time that a customer would have to wait in line before being served?

Which of the following is not generally considered as a measure of system performance in queuing analysis?

The following questions refer to this data for a multiple server,priority service queuing model: What is average time in line for a high priority item?

The term "queue discipline" refers to:

A bank is designing a new branch office and needs to determine how much driveway space to allow for cars waiting for drive up teller service.The drive up service will have three tellers and a single waiting line.At another branch of the bank in a similar setting,the average service time for drive up tellers is 4 minutes per customer and average arrival rate is 36 customers per hour.It is expected that the new bank will have similar characteristics. What is the expected average number of cars in the system?