Question 1

A system in which the customer receives service from only one station and then exits the system is which of the following?

Accepted Answer

A) a single-phase system 
B) a single-channel system 
C) a multiple channel system 
D) a multiphase system 
E) a limited-access system 
A) a single-phase system 
B) a single-channel system 
C) a multiple channel system 
D) a multiphase system 
E) a limited-access system

Question 2

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 average time a unit spends in the system and the average time a unit spends waiting (in hours)?

Accepted Answer

Ws = 1 / (μ - λ)= 1 / (12 - 10

Question 3

Which of the following is NOT a common queuing situation?

Accepted Answer

A) grocery shoppers being served by checkout clerks 
B) commuters slowing or stopping at toll plazas to pay highway tolls 
C) machinery waiting to be repaired or maintained 
D) parcel delivery truck following its computer-generated route 
E) patients in a health clinic waiting to see one of several doctors 
A) grocery shoppers being served by checkout clerks 
B) commuters slowing or stopping at toll plazas to pay highway tolls 
C) machinery waiting to be repaired or maintained 
D) parcel delivery truck following its computer-generated route 
E) patients in a health clinic waiting to see one of several doctors

Question 4

A queuing model that follows the M/M/1 assumptions has λ = 10 and μ = 12.What is the average number of units in the system?

Accepted Answer

A) 0.83 
B) 2 
C) 2.5 
D) 5 
E) 6 
A) 0.83 
B) 2 
C) 2.5 
D) 5 
E) 6

Question 5

If the service time within a queuing system is constant,the service rate can be easily described by a negative exponential distribution.

Accepted Answer

A) True 
 B)False

Question 6

A copy center has five machines that serve many customers throughout the day.The waiting-line system for copy service has an infinite population,while the waiting-line system for copier maintenance has a finite population

Accepted Answer

A) True 
 B)False

Question 7

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 8

A waiting-line system that meets the assumptions of M/M/1 has λ = 1,μ= 4.Calculate Po.Build a table showing the probability of more than 0,1,2,3,4,5,6,and 7 units in the system.Round to six decimal places in your work

Accepted Answer

Po = 1 - .

Question 9

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 utilization factor?

Accepted Answer

A) 20% 
B) 30% 
C) 40% 
D) 50% 
E) 60% 
A) 20% 
B) 30% 
C) 40% 
D) 50% 
E) 60%

Question 10

Which one of the following is NOT a characteristic of a Model A or M/M/1 system?

Accepted Answer

A) exponential service time pattern 
B) single number of servers 
C) single number of phases 
D) Poisson arrival rate pattern 
E) limited population size 
A) exponential service time pattern 
B) single number of servers 
C) single number of phases 
D) Poisson arrival rate pattern 
E) limited population size

Question 11

A waiting line or ________ is where items or people are in a line awaiting service;________ is a body of knowledge about waiting lines.

Accepted Answer

queue,queu

Question 12

A waiting-line system with one waiting line and three sequential processing stages is a multiple-server,single-phase system.

Accepted Answer

A) True 
 B)False

Question 13

Identify the seven major measures of a queue system's performance.

Accepted Answer

• The average time each customer or obje

Question 14

The potential restaurant customer who says to her husband,"The line looks too long;let's eat somewhere else," is an illustration of which element of arrival behavior?

Accepted Answer

A) first-in,first-out 
B) balk 
C) renege 
D) random departure 
E) frustration 
A) first-in,first-out 
B) balk 
C) renege 
D) random departure 
E) frustration

Question 15

A(n)________ queuing system has one line and one server.

Accepted Answer

The answer of A(n)________ queuing system has one line and...

Question 16

Waiting-line models are useful to operations in such diverse settings as service systems,maintenance activities,and shop-floor control.

Accepted Answer

A) True 
 B)False

Question 17

Which one of the following is NOT a characteristic of a Model C or M/D/1 system?

Accepted Answer

A) single server 
B) single phase 
C) Poisson arrival rate pattern 
D) exponential service time pattern 
E) unlimited population size 
A) single server 
B) single phase 
C) Poisson arrival rate pattern 
D) exponential service time pattern 
E) unlimited population size

Question 18

A queuing model that follows the M/M/1 assumptions has λ = 2 and μ = 3.What is the average time in the system?

Accepted Answer

A) 2/3 
B) 1 
C) 1.5 
D) 2 
E) 6 
A) 2/3 
B) 1 
C) 1.5 
D) 2 
E) 6

Question 19

Describe the difference between FIFO and LIFO queue disciplines.

Accepted Answer

FIFO (first-in,first-out)serves first th

Exam 25: Queuing Models

A system in which the customer receives service from only one station and then exits the system is which of the following?

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 average time a unit spends in the system and the average time a unit spends waiting (in hours)?

Which of the following is NOT a common queuing situation?

A queuing model that follows the M/M/1 assumptions has λ = 10 and μ = 12.What is the average number of units in the system?

If the service time within a queuing system is constant,the service rate can be easily described by a negative exponential distribution.

A copy center has five machines that serve many customers throughout the day.The waiting-line system for copy service has an infinite population,while the waiting-line system for copier maintenance has a finite population

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

A waiting-line system that meets the assumptions of M/M/1 has λ = 1,μ= 4.Calculate Po.Build a table showing the probability of more than 0,1,2,3,4,5,6,and 7 units in the system.Round to six decimal places in your work

Which one of the following is NOT a characteristic of a Model A or M/M/1 system?

A waiting line or ________ is where items or people are in a line awaiting service;________ is a body of knowledge about waiting lines.

A waiting-line system with one waiting line and three sequential processing stages is a multiple-server,single-phase system.

Identify the seven major measures of a queue system's performance.

The potential restaurant customer who says to her husband,"The line looks too long;let's eat somewhere else," is an illustration of which element of arrival behavior?

A(n)________ queuing system has one line and one server.

Waiting-line models are useful to operations in such diverse settings as service systems,maintenance activities,and shop-floor control.

Which one of the following is NOT a characteristic of a Model C or M/D/1 system?

A queuing model that follows the M/M/1 assumptions has λ = 2 and μ = 3.What is the average time in the system?

Describe the difference between FIFO and LIFO queue disciplines.

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A waiting line or is where items or people are in a line awaiting service; is a body of knowledge about waiting lines.