Question 1

In a single-server system,the utilization is equal to the average arrival rate divided by the average service rate.

Accepted Answer

A) True 
 B)False

Question 2

Which of these would increase server utilization?

Accepted Answer

A)  An increase in the average service rate. 
B)  An increase in average arrival rate. 
C)  An increase in the number of servers. 
D)  A decrease in service time. 
E)  All will increase the system utilization. 
A)  An increase in the average service rate. 
B)  An increase in average arrival rate. 
C)  An increase in the number of servers. 
D)  A decrease in service time. 
E)  All will increase the system utilization.

Question 3

In an infinite source model,the server utilization is the ratio of the average arrival rate to the service capacity.

Accepted Answer

A) True 
 B)False

Question 4

The basic multiple-server-with-priority queuing model assumes that:

Accepted Answer

A)  arrival rates are exponentially distributed. 
B)  service times are Poisson distributed. 
C)  items are serviced in order of arrival. 
D)  items are serviced in order of priority class. 
E)  service activities are pre-emptive. 
A)  arrival rates are exponentially distributed. 
B)  service times are Poisson distributed. 
C)  items are serviced in order of arrival. 
D)  items are serviced in order of priority class. 
E)  service activities are pre-emptive.

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

What is the expected average number of cars in the system?

Accepted Answer

A)  approx. 2.6 
B)  approx. 5.0 
C)  approx. 2.3 
D)  approx. 1.8 
E)  approx. 4.2 
A)  approx. 2.6 
B)  approx. 5.0 
C)  approx. 2.3 
D)  approx. 1.8 
E)  approx. 4.2

Question 9

A single phase queuing system is one which has a single:

Accepted Answer

A)  type of customer (homogeneous). 
B)  server. 
C)  customer being served. 
D)  operational step. 
E)  time all customers wait. 
A)  type of customer (homogeneous). 
B)  server. 
C)  customer being served. 
D)  operational step. 
E)  time all customers wait.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

For infinite source models,which of the following will equal the average time a customer is in the system?
I.Average number in the system divided by the arrival rate
II.Average number in the system multiplied by the arrival rate
III.Average time in line plus average service time

Accepted Answer

A)  I only 
B)  II only 
C)  I and III 
D)  II and III 
E)  III only 
A)  I only 
B)  II only 
C)  I and III 
D)  II and III 
E)  III only

Question 12

Customers arrive at a video rental desk at the rate of one per minute (Poisson).Each server can handle .40 customers per minute (Poisson).
(i)If there are four servers,determine:
1)The average time it takes to rent a video tape
2)The probability of three or fewer customers in the system
(ii)What is the minimum number of servers needed to achieve an average time in the system of less than three minutes?

Accepted Answer

The answer of Customers arrive at a video rental desk...

Question 13

The following questions refer to this data for a multiple server, priority service queuing model:
  
-What is server utilization?

Accepted Answer

The answer of The following questions refer to this data...

Question 14

For how many tellers should the system be designed if the managers want the average time a customer spends in the drive up system to be no more than 5 minutes?

Accepted Answer

A)  at least 3 
B)  at least 4 
C)  at least 5 
D)  at least 6 
E)  It is impossible to say without more information. 
A)  at least 3 
B)  at least 4 
C)  at least 5 
D)  at least 6 
E)  It is impossible to say without more information.

Question 15

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)  none of the choices. 
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)  none of the choices.

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

The most commonly used queuing models assume a service rate that follows an exponential distribution.

Accepted Answer

A) True 
 B)False

Question 18

If customers are homogeneous (similar needs),then separate waiting lines for each server are preferable.

Accepted Answer

A) True 
 B)False

Question 19

A queuing system has four work stations with three workers to staff each station.To analyze this system,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 20

Why is there waiting in a queue even if the service capacity exceeds the average demand on the system ?

Accepted Answer

A)  Poor scheduling 
B)  Slow service 
C)  Low utilization 
D)  Variability in arrival and service rates 
E)  Multiple phase processing 
A)  Poor scheduling 
B)  Slow service 
C)  Low utilization 
D)  Variability in arrival and service rates 
E)  Multiple phase processing

Exam 18: A: Waiting-Line Analysis

In a single-server system,the utilization is equal to the average arrival rate divided by the average service rate.

Which of these would increase server utilization?

In an infinite source model,the server utilization is the ratio of the average arrival rate to the service capacity.

The basic multiple-server-with-priority queuing model assumes that:

What is the average machine downtime with two operators?

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

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

What is the expected average number of cars in the system?

A single phase queuing system is one which has a single:

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

For infinite source models,which of the following will equal the average time a customer is in the system? I.Average number in the system divided by the arrival rate II.Average number in the system multiplied by the arrival rate III.Average time in line plus average service time

The following questions refer to this data for a multiple server, priority service queuing model: -What is server utilization?

For how many tellers should the system be designed if the managers want the average time a customer spends in the drive up system to be no more than 5 minutes?

The goal of queuing analysis is to minimize:

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

The most commonly used queuing models assume a service rate that follows an exponential distribution.

If customers are homogeneous (similar needs),then separate waiting lines for each server are preferable.

A queuing system has four work stations with three workers to staff each station.To analyze this system,the number of "servers" is:

Why is there waiting in a queue even if the service capacity exceeds the average demand on the system ?

Introduction to Operations Management

Competitiveness, Strategic Planning, and Productivity

Demand Forecasting

A: Product Design

B: Product Design

A: Strategic Capacity Planning

B: Strategic Capacity Planning

A: Process Design and Facility Layout

B: Process Design and Facility Layout

A: Design of Work Systems

B: Design of Work Systems

A: Location Planning and Analysis

B: Location Planning and Analysis

Management of Quality

A: Statistical Quality Control

B: Statistical Quality Control

Supply Chain Management

Inventory Management

Aggregate Operations Planning

Material Requirements Planning and Enterprise Resource Planning

A: Just-In-Time and Lean Production

B: Just-In-Time and Lean Production

Job and Staff Scheduling

Project Management

B: Waiting-Line Analysis

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