Question 1

The cost of customers waiting is always greater than the cost of increasing service capacity.

Accepted Answer

A) True 
 B)False  False

Question 2

The reciprocal of the average rate of arrivals is the average interarrival time.

Accepted Answer

A) True 
 B)False  True

Question 3

Compared to a single server system with exponential service time,the same system with a constant service time will have an average of one-half the number of customers waiting in the system.

Accepted Answer

A) True 
 B)False  False

Question 4

A bank of ten machines requires regular periodic service.Machine running time and service time are both exponential.Machines run for an average of 44 minutes between service requirements,and service time averages 6 minutes per machine. What is the average machine downtime with two operators?

Accepted Answer

A) 1.71 minutes 
B) 3.46 minutes 
C) 6.25 minutes 
D) 7.71 minutes 
E) 9.46 minutes 
A) 1.71 minutes 
B) 3.46 minutes 
C) 6.25 minutes 
D) 7.71 minutes 
E) 9.46 minutes

Question 5

A multiple server system has customers arriving at an average rate of five per hour and an average service time of forty minutes.The minimum number of servers for this system to be underloaded is:

Accepted Answer

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

Question 6

A multiple server queuing system has a Poisson arrival rate of 9 per hour and exponential service time averaging 5 per hour.Server cost is $100 per hour and the cost of waiting is $360 per hour.Based on total cost,how many servers should be staffed?

Accepted Answer

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

Question 7

Which of the following is not a disadvantage of a single line for a multiple server queuing system?

Accepted Answer

A) It might appear too long for customers. 
B) It increases average wait time for customers. 
C) It may take up too much space. 
D) Customers can't choose their favourite server. 
E) Servers may not work as fast as if they were responsible for their own line. 
A) It might appear too long for customers. 
B) It increases average wait time for customers. 
C) It may take up too much space. 
D) Customers can't choose their favourite server. 
E) Servers may not work as fast as if they were responsible for their own line.

Question 8

The following questions refer to this data for a multiple server,priority service queuing model:
 11eab92b_c474_e9c0_99e6_1542e063064b

Accepted Answer

What is the average

Question 9

Typically customers will perceive waiting times to be less if the line continues to move.

Accepted Answer

A) True 
 B)False

Question 10

A bank of ten machines requires regular periodic service.Machine running time and service time are both exponential.Machines run for an average of 44 minutes between service requirements,and service time averages 6 minutes per machine. If operators cost $15 per hour in wages and fringe benefits and machine downtime costs $75 per hour in lost production,what is the optimal number of operators for this bank of machines?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 11

Average service rate is the reciprocal of the average service time.

Accepted Answer

A) True 
 B)False

Question 12

Having separate lines for customers that are heterogeneous (different needs)can reduce the variability of service times.

Accepted Answer

A) True 
 B)False

Question 13

A multiple server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 4 customers per hour and an average service time of 18 minutes per customer.The minimum number of servers required to avoid an overloaded system is:

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 14

The goal of queuing analysis is to minimize the cost of customers having to wait.

Accepted Answer

A) True 
 B)False

Question 15

A bank of ten machines requires regular periodic service.Machine running time and service time are both exponential.Machines run for an average of 44 minutes between service requirements,and service time averages 6 minutes per machine. What is the probability that a machine will have to wait for service with two operators?

Accepted Answer

A) 654 
B) 090 
C) 346 
D) 910 
E) 016 
A) 654 
B) 090 
C) 346 
D) 910 
E) 016

Question 16

Compared to a single server system with exponential service time,a single server system with a constant service time causes a reduction of 50 percent in the average number waiting in line.

Accepted Answer

A) True 
 B)False

Question 17

In an infinite source model,the average number being served is equal to the ratio of the average arrival rate to the average service rate.

Accepted Answer

A) True 
 B)False

Question 18

Which one of the following measures of system performance is a key measure?

Accepted Answer

A) The average number of customers waiting in line. 
B) The average time customers wait in line. 
C) The average time customers are in the system. 
D) The average number of customers in the system. 
E) The probability that an arrival will have to wait for service. 
A) The average number of customers waiting in line. 
B) The average time customers wait in line. 
C) The average time customers are in the system. 
D) The average number of customers in the system. 
E) The probability that an arrival will have to wait for service.

Question 19

The goal of queuing analysis is to minimize:

Accepted Answer

A) the sum of customer waiting costs and costs of providing capacity. 
B) the sum of customer waiting time and service time. 
C) costs of providing capacity. 
D) customer waiting time. 
E) the number of servers,service cost. 
A) the sum of customer waiting costs and costs of providing capacity. 
B) the sum of customer waiting time and service time. 
C) costs of providing capacity. 
D) customer waiting time. 
E) the number of servers,service cost.

Question 20

The goal of queuing analysis is to minimize the length of customer waiting lines.

Accepted Answer

A) True 
 B)False

Exam 25: Waiting-Line Analysis

The cost of customers waiting is always greater than the cost of increasing service capacity.

The reciprocal of the average rate of arrivals is the average interarrival time.

Compared to a single server system with exponential service time,the same system with a constant service time will have an average of one-half the number of customers waiting in the system.

A bank of ten machines requires regular periodic service.Machine running time and service time are both exponential.Machines run for an average of 44 minutes between service requirements,and service time averages 6 minutes per machine. What is the average machine downtime with two operators?

A multiple server system has customers arriving at an average rate of five per hour and an average service time of forty minutes.The minimum number of servers for this system to be underloaded is:

A multiple server queuing system has a Poisson arrival rate of 9 per hour and exponential service time averaging 5 per hour.Server cost is $100 per hour and the cost of waiting is $360 per hour.Based on total cost,how many servers should be staffed?

Which of the following is not a disadvantage of a single line for a multiple server queuing system?

The following questions refer to this data for a multiple server,priority service queuing model: 11eab92b_c474_e9c0_99e6_1542e063064b

Typically customers will perceive waiting times to be less if the line continues to move.

Average service rate is the reciprocal of the average service time.

Having separate lines for customers that are heterogeneous (different needs)can reduce the variability of service times.

A multiple server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 4 customers per hour and an average service time of 18 minutes per customer.The minimum number of servers required to avoid an overloaded system is:

The goal of queuing analysis is to minimize the cost of customers having to wait.

Compared to a single server system with exponential service time,a single server system with a constant service time causes a reduction of 50 percent in the average number waiting in line.

In an infinite source model,the average number being served is equal to the ratio of the average arrival rate to the average service rate.

Which one of the following measures of system performance is a key measure?

The goal of queuing analysis is to minimize:

The goal of queuing analysis is to minimize the length of customer waiting lines.

Introduction to Operations Management

Competitiveness, strategic Planning, and Productivity

Demand Forecasting

Product Design

Reliability

Strategic Capacity Planning

Decision Analysis

Process Design and Facility Layout

Linear Programming

Workjob Design

Learning Curves

Location Planning and Analysis

the Transportation Model

Management of Quality

Statistical Quality Control

Acceptance Sampling

Supply Chain Management

Inventory Management

Aggregate Operations Planning and Master Scheduling

Material Requirements Planning and Enterprise Resource Planning

Just-In-Time and Lean Production

Maintenance

Job and Staff Scheduling

Project Management

Simulation

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