Question 1

The number of customers in a system is the number in the queue plus one

Accepted Answer

A) True 
 B)False

Question 2

Priority :Average Arrival Rate (exponential interarrival times)
High : 3 per hour
Low : 5 per hour
Number of servers: 5
Service rate: 2 per hour (exponential service times)
-What is the average number of all items waiting in line for service?

Accepted Answer

A) 0 
B) 0 24 
C) 1 74 
D) 1 98 
E) 2 22 
A) 0 
B) 0 24 
C) 1 74 
D) 1 98 
E) 2 22

Question 3

A single bay car wash with an exponential arrival rate and service time has cars arriving an average of 10 minutes apart,and an average service time of 4 minutes The utilization factor is:

Accepted Answer

A) 0 24 
B) 0 4 
C) 0 67 
D) 2 5 
E) None of the above 
A) 0 24 
B) 0 4 
C) 0 67 
D) 2 5 
E) None of the above

Question 4

The cost of customer waiting is easy to estimate

Accepted Answer

A) True 
 B)False

Question 5

The expected waiting time in line is equal to the expected number of customers in line divided by the arrival rate

Accepted Answer

A) True 
 B)False

Question 6

Decreasing the variability of service times,without any change in the mean,improves the performance of a single-server queueing system substantially

Accepted Answer

A) True 
 B)False

Question 7

Multiple-server queueing systems can perform satisfactorily with somewhat higher utilization factors than can single-server queueing systems

Accepted Answer

A) True 
 B)False

Question 8

Priority :Average Arrival Rate (exponential interarrival times)
High : 3 per hour
Low : 5 per hour
Number of servers: 5
Service rate: 2 per hour (exponential service times)
-What is the average time in line (in minutes)for a high priority item?

Accepted Answer

A) 2 
B) 5 
C) 24 
D) 35 
E) 54 
A) 2 
B) 5 
C) 24 
D) 35 
E) 54

Question 9

Which of the following is not an example of a commercial service system?

Accepted Answer

A) ATM cash machine 
B) Brokerage service 
C) Travel agency 
D) Tool crib 
E) Call center 
A) ATM cash machine 
B) Brokerage service 
C) Travel agency 
D) Tool crib 
E) Call center

Question 10

Which of these would increase system utilization?

Accepted Answer

A) An increase in the service rate 
B) An increase in the arrival rate 
C) An increase in the number of servers 
D) A decrease in service time 
E) All of the above 
A) An increase in the service rate 
B) An increase in the arrival rate 
C) An increase in the number of servers 
D) A decrease in service time 
E) All of the above

Question 11

Customers arrive at a suburban ticket outlet at the rate of 14 per hour on Monday mornings (exponential interarrival times). Selling the tickets and providing general information takes an average of 3 minutes per customer, and varies exponentially. There is 1 ticket agent on duty on Mondays.
-What is the system utilization?

Accepted Answer

A) 0 6 
B) 0 7 
C) 0 8 
D) 0 9 
E) 1 
A) 0 6 
B) 0 7 
C) 0 8 
D) 0 9 
E) 1

Question 12

What is the minimum number of clerks needed to keep the average time in the system under 5 minutes?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6 
A) 2 
B) 3 
C) 4 
D) 5 
E) 6

Question 13

What is the minimum number of servers needed to achieve an average time in the system of less than three minutes?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6 
A) 2 
B) 3 
C) 4 
D) 5 
E) 6

Question 14

Priority :Average Arrival Rate (exponential interarrival times)
High : 3 per hour
Low : 5 per hour
Number of servers: 5
Service rate: 2 per hour (exponential service times)
-What is the average time in the system (in minutes)for a high priority item?

Accepted Answer

A) 2 
B) 5 
C) 24 
D) 35 
E) 54 
A) 2 
B) 5 
C) 24 
D) 35 
E) 54

Question 15

What is the average number of customers waiting for service if 6 clerks are used?

Accepted Answer

A) 0 
B) 0 01 
C) 0 1 
D) 1 
E) 10 
A) 0 
B) 0 01 
C) 0 1 
D) 1 
E) 10

Question 16

Customers filter into a record shop at an average of 1 per minute (exponential interarrivals) where the service rate is 15 per hour (exponential service times).
-What is the minimum number of servers needed to keep the average time in the system under 6 minutes?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6 
A) 2 
B) 3 
C) 4 
D) 5 
E) 6

Question 17

Applying nonpreemptive priorities improves the measures of performance in the top priority class even more than applying preemptive priorities

Accepted Answer

A) True 
 B)False

Question 18

The lack-of-memory property refers to a customer's willingness to wait in line even though there are other customers that will be served first

Accepted Answer

A) True 
 B)False

Question 19

All single-server queueing models require the utilization factor to be less than 1

Accepted Answer

A) True 
 B)False

Question 20

As the ratio of arrival rate to service rate is increased,which of the following is likely?

Accepted Answer

A) Customers move through the system in less time because utilization is increased 
B) Customers move through the system more slowly because utilization is increased 
C) Utilization is decreased because of the added strain on the system 
D) The average number in the system decreases 
E) None of the above 
A) Customers move through the system in less time because utilization is increased 
B) Customers move through the system more slowly because utilization is increased 
C) Utilization is decreased because of the added strain on the system 
D) The average number in the system decreases 
E) None of the above

The number of customers in a system is the number in the queue plus one

Priority :Average Arrival Rate (exponential interarrival times) High : 3 per hour Low : 5 per hour Number of servers: 5 Service rate: 2 per hour (exponential service times) -What is the average number of all items waiting in line for service?

A single bay car wash with an exponential arrival rate and service time has cars arriving an average of 10 minutes apart,and an average service time of 4 minutes The utilization factor is:

The cost of customer waiting is easy to estimate

The expected waiting time in line is equal to the expected number of customers in line divided by the arrival rate

Decreasing the variability of service times,without any change in the mean,improves the performance of a single-server queueing system substantially

Multiple-server queueing systems can perform satisfactorily with somewhat higher utilization factors than can single-server queueing systems

Priority :Average Arrival Rate (exponential interarrival times) High : 3 per hour Low : 5 per hour Number of servers: 5 Service rate: 2 per hour (exponential service times) -What is the average time in line (in minutes)for a high priority item?

Which of the following is not an example of a commercial service system?

Which of these would increase system utilization?

What is the minimum number of clerks needed to keep the average time in the system under 5 minutes?

What is the minimum number of servers needed to achieve an average time in the system of less than three minutes?

Priority :Average Arrival Rate (exponential interarrival times) High : 3 per hour Low : 5 per hour Number of servers: 5 Service rate: 2 per hour (exponential service times) -What is the average time in the system (in minutes)for a high priority item?

What is the average number of customers waiting for service if 6 clerks are used?

Customers filter into a record shop at an average of 1 per minute (exponential interarrivals) where the service rate is 15 per hour (exponential service times). -What is the minimum number of servers needed to keep the average time in the system under 6 minutes?

Applying nonpreemptive priorities improves the measures of performance in the top priority class even more than applying preemptive priorities

The lack-of-memory property refers to a customer's willingness to wait in line even though there are other customers that will be served first

All single-server queueing models require the utilization factor to be less than 1

As the ratio of arrival rate to service rate is increased,which of the following is likely?

Introduction

Linear programming: Basic Concepts

Linear programming: Formulation and applications

Theart of modeling with spread sheets

What-If Analysis for linear programming

Network optimization problems

Using binary integer programming to deal withy es-Or-No decisions

Non linear programming

Decision Analysis

Forecasting

Computer simulation: Basic Concepts

Computer simulation with risks olver platform

Solution concepts for linear programming

Transportation and assignment problems

Pert CPM models for project management

Goal programming

Inventory management with known demand

Inventory management with uncertain demand

Computer simulation with crystal ball

Filters

Exam 11: Queuing models

The number of customers in a system is the number in the queue plus one

Priority :Average Arrival Rate (exponential interarrival times) High : 3 per hour Low : 5 per hour Number of servers: 5 Service rate: 2 per hour (exponential service times) -What is the average number of all items waiting in line for service?

A single bay car wash with an exponential arrival rate and service time has cars arriving an average of 10 minutes apart,and an average service time of 4 minutes The utilization factor is:

The cost of customer waiting is easy to estimate

The expected waiting time in line is equal to the expected number of customers in line divided by the arrival rate

Decreasing the variability of service times,without any change in the mean,improves the performance of a single-server queueing system substantially

Multiple-server queueing systems can perform satisfactorily with somewhat higher utilization factors than can single-server queueing systems

Priority :Average Arrival Rate (exponential interarrival times) High : 3 per hour Low : 5 per hour Number of servers: 5 Service rate: 2 per hour (exponential service times) -What is the average time in line (in minutes)for a high priority item?

Which of the following is not an example of a commercial service system?

Which of these would increase system utilization?

What is the minimum number of clerks needed to keep the average time in the system under 5 minutes?

What is the minimum number of servers needed to achieve an average time in the system of less than three minutes?

Priority :Average Arrival Rate (exponential interarrival times) High : 3 per hour Low : 5 per hour Number of servers: 5 Service rate: 2 per hour (exponential service times) -What is the average time in the system (in minutes)for a high priority item?

What is the average number of customers waiting for service if 6 clerks are used?

Customers filter into a record shop at an average of 1 per minute (exponential interarrivals) where the service rate is 15 per hour (exponential service times). -What is the minimum number of servers needed to keep the average time in the system under 6 minutes?

Applying nonpreemptive priorities improves the measures of performance in the top priority class even more than applying preemptive priorities

The lack-of-memory property refers to a customer's willingness to wait in line even though there are other customers that will be served first

All single-server queueing models require the utilization factor to be less than 1

As the ratio of arrival rate to service rate is increased,which of the following is likely?

Introduction

Linear programming: Basic Concepts

Linear programming: Formulation and applications

Theart of modeling with spread sheets

What-If Analysis for linear programming

Network optimization problems

Using binary integer programming to deal withy es-Or-No decisions

Non linear programming

Decision Analysis

Forecasting

Computer simulation: Basic Concepts

Computer simulation with risks olver platform

Solution concepts for linear programming

Transportation and assignment problems

Pert CPM models for project management

Goal programming

Inventory management with known demand

Inventory management with uncertain demand

Computer simulation with crystal ball

Filters