Question 1

In the analysis of queuing models, the Poisson distribution often describes arrival rates and service times are often described by the negative exponential distribution.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following represents an unlimited queue?

Accepted Answer

A)  drive-through lane at a fast-food restaurant 
B)  small barbershop with only 5 chairs for waiting customers 
C)  toll booth serving automobiles on an interstate 
D)  faculty office with limited seating during office hours 
E)  restaurant with no outside seating and limited capacity due to fire department restrictions 
A)  drive-through lane at a fast-food restaurant 
B)  small barbershop with only 5 chairs for waiting customers 
C)  toll booth serving automobiles on an interstate 
D)  faculty office with limited seating during office hours 
E)  restaurant with no outside seating and limited capacity due to fire department restrictions

Question 3

In an earlier chapter, you were introduced to a "traditional" view of costs and a "full cost" view of costs, with respect to a certain type of analysis. How might that lesson apply here?
 In particular, might operations managers pay more attention to some kinds of costs than others?

Accepted Answer

This is a critical-thinking exercise for

Question 4

Most banks have changed from having a line in front of each teller to a system where one line feeds all tellers. Which system is better?
 Why?

Accepted Answer

It is inherently mor

Question 5

Students arrive randomly at the help desk of the computer lab. There is only one service agent, and the time required for inquiry varies from student to student. Arrival rates have been found to follow the Poisson distribution, and the service times follow the negative exponential distribution. The average arrival rate is 12 students per hour, and the average service rate is 20 students per hour. What is the average service time for this problem?

Accepted Answer

A)  1 minute 
B)  2 minutes 
C)  3 minutes 
D)  5 minutes 
E)  20 minutes 
A)  1 minute 
B)  2 minutes 
C)  3 minutes 
D)  5 minutes 
E)  20 minutes

Question 6

A(n) __________ is a discrete probability distribution that often describes the arrival rate in queuing theory.

Accepted Answer

Poisson di

Question 7

Students arrive randomly at the help desk of the computer lab. There is only one service agent, and the time required for inquiry varies from student to student. Arrival rates have been found to follow the Poisson distribution, and the service times follow the negative exponential distribution. The average arrival rate is 12 students per hour, and the average service rate is 20 students per hour. How many students, on the average, will be waiting in line at any one time?

Accepted Answer

A)  0.9 students 
B)  1.5 students 
C)  3 students 
D)  4 students 
E)  36 students 
A)  0.9 students 
B)  1.5 students 
C)  3 students 
D)  4 students 
E)  36 students

Question 8

What are Ls and Lq, as used in waiting line terminology?
 Which is larger, Ls or Lq?
 Explain.

Accepted Answer

Ls is the average number of units in the

Question 9

Describe the important operating characteristics of a queuing system.

Accepted Answer

The operating characteristics usually co

Question 10

A concert hall, employing both ticket takers and ushers to seat patrons, behaves typically as a

Accepted Answer

A)  multi-channel, single phase system 
B)  multi-channel, multi-phase system 
C)  single channel, single phase system 
D)  single channel, multi-phase system 
E)  none of the above 
A)  multi-channel, single phase system 
B)  multi-channel, multi-phase system 
C)  single channel, single phase system 
D)  single channel, multi-phase system 
E)  none of the above

Question 11

In a finite or limited population waiting line, the __________ is calculated from the average service time and average time between service requirements before the problem can be completed.

Accepted Answer

The answer of In a finite or limited population waiting...

Question 12

Customers take a number as they join the waiting line of the customer service counter at a discount store. There are two customer service agents. Provide the most likely characteristics of this system.
a. name of model
b. number of channels
c. number of phases
d. arrival rate distribution
e. service time distribution
f. population size
g. queue discipline

Accepted Answer

Multi-channel system

Question 13

Suppose that a fast food restaurant wants the average line to be 4 customers and that 80 customers arrive each hours. How many minutes will the average customer be forced to wait in line?

Accepted Answer

Little's Law 4 custo

Question 14

Which of the following is a requirement for application of Little's Law to be valid?

Accepted Answer

A)  arrival rates that follow the Poisson distribution 
B)  FIFO queue discipline 
C)  steady state conditions 
D)  single channel 
E)  multiple phase 
A)  arrival rates that follow the Poisson distribution 
B)  FIFO queue discipline 
C)  steady state conditions 
D)  single channel 
E)  multiple phase

Question 15

The __________ probability distribution is a continuous probability distribution often used to describe the service time in a queuing system.

Accepted Answer

negative e

Question 16

A waiting line meeting the M/M/1 assumptions has an arrival rate of 10 per hour and a service rate of 12 per hour. What is the probability that the waiting line is empty?

Accepted Answer

Pₒ = 1 - λ

Question 17

A waiting line model meeting the assumptions of M/M/1 has an arrival rate of 2 per hour and a service rate of 6 per hour; the utilization factor for the system is approximately

Accepted Answer

A)  0.25 
B)  0.33 
C)  0.50 
D)  0.67 
E)  3.00 
A)  0.25 
B)  0.33 
C)  0.50 
D)  0.67 
E)  3.00

Question 18

Which one of the following is not a characteristic of a Model B or M/M/S system?

Accepted Answer

A)  unlimited population size 
B)  single channel 
C)  single queue 
D)  single phase 
E)  Poisson arrival rate pattern 
A)  unlimited population size 
B)  single channel 
C)  single queue 
D)  single phase 
E)  Poisson arrival rate pattern

Question 19

An airline ticket counter, with several agents for one line of customers, is an example of a

Accepted Answer

A)  single channel, single phase system 
B)  single channel, multi-phase system 
C)  multi-channel, single phase system 
D)  multi-channel, multi-phase system 
E)  none of the above 
A)  single channel, single phase system 
B)  single channel, multi-phase system 
C)  multi-channel, single phase system 
D)  multi-channel, multi-phase system 
E)  none of the above

Question 20

In a repetitive focus factory, the number of phases found in the system might refer to

Accepted Answer

A)  the number of successive operations that have to be performed on a part 
B)  the number of machines doing the same necessary operations 
C)  the number of parts waiting to be processed 
D)  all of the above depending on the layout 
E)  none of the above 
A)  the number of successive operations that have to be performed on a part 
B)  the number of machines doing the same necessary operations 
C)  the number of parts waiting to be processed 
D)  all of the above depending on the layout 
E)  none of the above

Exam 24: Waiting-Line Models

In the analysis of queuing models, the Poisson distribution often describes arrival rates and service times are often described by the negative exponential distribution.

Which of the following represents an unlimited queue?

In an earlier chapter, you were introduced to a "traditional" view of costs and a "full cost" view of costs, with respect to a certain type of analysis. How might that lesson apply here? In particular, might operations managers pay more attention to some kinds of costs than others?

Most banks have changed from having a line in front of each teller to a system where one line feeds all tellers. Which system is better? Why?

A(n) __________ is a discrete probability distribution that often describes the arrival rate in queuing theory.

What are Ls and Lq, as used in waiting line terminology? Which is larger, Ls or Lq? Explain.

Describe the important operating characteristics of a queuing system.

A concert hall, employing both ticket takers and ushers to seat patrons, behaves typically as a

In a finite or limited population waiting line, the __________ is calculated from the average service time and average time between service requirements before the problem can be completed.

Suppose that a fast food restaurant wants the average line to be 4 customers and that 80 customers arrive each hours. How many minutes will the average customer be forced to wait in line?

Which of the following is a requirement for application of Little's Law to be valid?

The __________ probability distribution is a continuous probability distribution often used to describe the service time in a queuing system.

A waiting line meeting the M/M/1 assumptions has an arrival rate of 10 per hour and a service rate of 12 per hour. What is the probability that the waiting line is empty?

A waiting line model meeting the assumptions of M/M/1 has an arrival rate of 2 per hour and a service rate of 6 per hour; the utilization factor for the system is approximately

Which one of the following is not a characteristic of a Model B or M/M/S system?

An airline ticket counter, with several agents for one line of customers, is an example of a

In a repetitive focus factory, the number of phases found in the system might refer to

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