Question 1

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  False

Question 2

Figure
Refer to the following data for a multiple-server,nonpreemptive priority queueing model:  
-What is the approximate average time in minutes that truckers wait to be seated?

Accepted Answer

A) 2.7. 
B) 4.5. 
C) 8.4. 
D) 13.6. 
E) 15.8. 
A) 2.7. 
B) 4.5. 
C) 8.4. 
D) 13.6. 
E) 15.8. B

Question 3

Figure
Refer to the following data for a multiple-server,nonpreemptive priority queueing model:  
-What is the system utilization factor?

Accepted Answer

A) 0.45. 
B) 0.50. 
C) 0.55. 
D) 0.65. 
E) 0.80. 
A) 0.45. 
B) 0.50. 
C) 0.55. 
D) 0.65. 
E) 0.80. E

Question 4

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 5

If there are 4 servers,what is the probability of three or fewer customers in the system?

Accepted Answer

A) 0.19. 
B) 0.23. 
C) 0.63. 
D) 0.68. 
E) 0.79. 
A) 0.19. 
B) 0.23. 
C) 0.63. 
D) 0.68. 
E) 0.79.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

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 9

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

Accepted Answer

A) The average number waiting in line. 
B) The average number in the system. 
C) The system utilization factor. 
D) The cost of servers plus customer waiting cost. 
E) Service time. 
A) The average number waiting in line. 
B) The average number in the system. 
C) The system utilization factor. 
D) The cost of servers plus customer waiting cost. 
E) Service time.

Question 10

There are 5 servers in a system with an arrival rate of 6 per hour and a service time of 20 minutes.What is the system utilization?

Accepted Answer

A) 0.1. 
B) 0.3. 
C) 0.4. 
D) 1.2. 
E) 2.0. 
A) 0.1. 
B) 0.3. 
C) 0.4. 
D) 1.2. 
E) 2.0.

Question 11

Waiting lines occur even in systems that are less that 100% utilized because of variability in service rates and/or arrival rates.

Accepted Answer

A) True 
 B)False

Question 12

When designing a single-server queueing system,giving a relatively high utilization factor to the server ensures that the system is working efficiently.

Accepted Answer

A) True 
 B)False

Question 13

If a manager increases the system utilization standard (assuming no change in the customer arrival rate)what happens to the customer waiting time?

Accepted Answer

A) It increases exponentially. 
B) It increases proportionally. 
C) It decreases proportionally. 
D) It decreases exponentially. 
E) No change. 
A) It increases exponentially. 
B) It increases proportionally. 
C) It decreases proportionally. 
D) It decreases exponentially. 
E) No change.

Question 14

A queueing system has four crew with three members each.The number of "servers" is:

Accepted Answer

A) 3. 
B) 4. 
C) 7. 
D) 12. 
E) 1. 
A) 3. 
B) 4. 
C) 7. 
D) 12. 
E) 1.

Question 15

Which of the following is not an assumption of a multiple priority queueing model?

Accepted Answer

A) Exponential interarrival times. 
B) Exponential service times. 
C) Customers are processed in the order of arrival. 
D) Customers wait in a single line. 
E) All of the above are assumptions. 
A) Exponential interarrival times. 
B) Exponential service times. 
C) Customers are processed in the order of arrival. 
D) Customers wait in a single line. 
E) All of the above are assumptions.

Question 16

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

Queueing models enable finding an appropriate balance between the cost of service and the amount of waiting.

Accepted Answer

A) True 
 B)False

Question 18

Managers who oversee queueing systems are usually concerned with how many customers are waiting and how long they will have to wait.

Accepted Answer

A) True 
 B)False

Question 19

In a nonpreemptive priority system,customers are served in the order in which they arrive in the queue.

Accepted Answer

A) True 
 B)False

Question 20

The only distribution of interarrival times that fits having random arrivals is the exponential distribution.

Accepted Answer

A) True 
 B)False

Exam 12: Queueing Models

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

Figure Refer to the following data for a multiple-server,nonpreemptive priority queueing model: -What is the approximate average time in minutes that truckers wait to be seated?

Figure Refer to the following data for a multiple-server,nonpreemptive priority queueing model: -What is the system utilization factor?

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

If there are 4 servers,what is the probability of three or fewer customers in the system?

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

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

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

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

There are 5 servers in a system with an arrival rate of 6 per hour and a service time of 20 minutes.What is the system utilization?

Waiting lines occur even in systems that are less that 100% utilized because of variability in service rates and/or arrival rates.

When designing a single-server queueing system,giving a relatively high utilization factor to the server ensures that the system is working efficiently.

If a manager increases the system utilization standard (assuming no change in the customer arrival rate)what happens to the customer waiting time?

A queueing system has four crew with three members each.The number of "servers" is:

Which of the following is not an assumption of a multiple priority queueing model?

What is the minimum number of servers needed to keep the average time in the system under 6 minutes?

Queueing models enable finding an appropriate balance between the cost of service and the amount of waiting.

Managers who oversee queueing systems are usually concerned with how many customers are waiting and how long they will have to wait.

In a nonpreemptive priority system,customers are served in the order in which they arrive in the queue.

The only distribution of interarrival times that fits having random arrivals is the exponential distribution.

Introduction

Linear Programming: Basic Concepts

Linear Programming: Formulation and Applications

The Art of Modeling With Spreadsheets

What-If Analysis for Linear Programming

Network Optimization Problems

Using Binary Integer Programming to Deal With Yes-Or-No Decisions

Nonlinear Programming

Decision Analysis

Cd Supplement - Decision Analysis

Forecasting

CD Supplement - Additional Queueing Models

Computer Simulation: Basic Concepts

CD Supplement - the Inverse Transformation Method for Generating Random Observations

Computer Simulation With Crystal Ball

CD - Solution Concepts for Linear Programming

CD - Transportation and Assignment Problems

CD - Pertcpm Models for Project Management

CD - Goal Programming

CD - Inventory Management With Known Demand

CD - Inventory Management With Uncertain Demand

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