Question 1

Waiting lines cannot develop if the time to process a customer is constant.

Accepted Answer

A) True 
 B)False  False

Question 2

A super computer-accessory discount store often has customers who leave the checkout line before being served because of excessive waiting times.The store has a(n)

Accepted Answer

A) infinite customer population with balking customers. 
B) infinite customer population with reneging customers. 
C) finite customer population with balking customers. 
D) finite customer population with reneging customers. 
A) infinite customer population with balking customers. 
B) infinite customer population with reneging customers. 
C) finite customer population with balking customers. 
D) finite customer population with reneging customers. B

Question 3

Customers arrive according to a Poisson distribution.The average number of customer arrivals per hour is six.The probability that four customers will arrive in the next three hours is

Accepted Answer

A) less than or equal to 0.01. 
B) greater than 0.01 but less than or equal to 0.02. 
C) greater than 0.02 but less than or equal to 0.03. 
D) greater than 0.03. 
A) less than or equal to 0.01. 
B) greater than 0.01 but less than or equal to 0.02. 
C) greater than 0.02 but less than or equal to 0.03. 
D) greater than 0.03. A

Question 4

Customers arrive according to a Poisson distribution.The average number of customer arrivals per hour is three.The probability that four customers will arrive in the next two hours is

Accepted Answer

A) less than or equal to 0.10. 
B) greater than 0.10 but less than or equal to 0.12. 
C) greater than 0.12 but less than or equal to 0.14. 
D) greater than 0.14. 
A) less than or equal to 0.10. 
B) greater than 0.10 but less than or equal to 0.12. 
C) greater than 0.12 but less than or equal to 0.14. 
D) greater than 0.14.

Question 5

Scenario C.5
A trucking firm has five trucks that each requires service at an average rate of once every 50 hours,according to an exponential distribution.The firm has a mechanic who needs five hours to complete the average job with exponential service times.
-Use the information in Scenario C.5.What is the average time a truck spends in the system?

Accepted Answer

A) Fewer than or equal to 6.5 hours 
B) Greater than 6.5 hours but fewer than or equal to 7.0 hours 
C) Greater than 7.0 hours but fewer than or equal to 7.5 hours 
D) Greater than 7.5 hours 
A) Fewer than or equal to 6.5 hours 
B) Greater than 6.5 hours but fewer than or equal to 7.0 hours 
C) Greater than 7.0 hours but fewer than or equal to 7.5 hours 
D) Greater than 7.5 hours

Question 6

The mean of the Poisson distribution is equal to its standard deviation.

Accepted Answer

A) True 
 B)False

Question 7

Scenario C.2
Weary travelers arrive at Will Rogers International Airport,pick up their luggage,stumble to their cars,and proceed to the parking lot attendant to pay for their parking.Traveler interarrival times are exponentially distributed,as are the service times of the attendant.On average,travelers arrive every 25 seconds.The attendant can process three travelers per minute.
-Use the information in Scenario C.2.What is the probability that a traveler will pull up to the attendant's service window without having to wait for another customer?

Accepted Answer

A) Less than or equal to 0.15 
B) Greater than 0.15 but less than or equal to 0.25 
C) Greater than 0.25 but less than or equal to 0.35 
D) Greater than 0.35 
A) Less than or equal to 0.15 
B) Greater than 0.15 but less than or equal to 0.25 
C) Greater than 0.25 but less than or equal to 0.35 
D) Greater than 0.35

Question 8

The production rate has been steady at 20 units per hour.The average work-in-process inventory at this station is 15 units.What is the average lead time through this manufacturing station?

Accepted Answer

A) 15 minutes 
B) 30 minutes 
C) 45 minutes 
D) 1 hour 
A) 15 minutes 
B) 30 minutes 
C) 45 minutes 
D) 1 hour

Question 9

Customers arrive at the local grocery store every 30 seconds on average.Thirty percent of these customers spend an average of 15 minutes shopping and purchase 10 items or less.These lucky customers go to the express line where they enjoy an average checkout time of 5 minutes.Customers that don't meet the express line criterion average 40 minutes in the store and go to checkout line #2 where they spend an average of 10 minutes checking out.How many people are checking out at any given time?

Accepted Answer

A) Greater than 15 
B) Greater than 10 but less than or equal to 15 
C) Greater than 5 but less than or equal to 10 
D) Less than or equal to 5 
A) Greater than 15 
B) Greater than 10 but less than or equal to 15 
C) Greater than 5 but less than or equal to 10 
D) Less than or equal to 5

Question 10

Scenario C.6
The Jackson Machine Company has four cutting tools that need to be refurbished after an average of 30 hours,according to an exponential distribution.The single machine that refurbishes the tools needs 15 hours for each tool on the average,with exponential service times.
-Use the information in Scenario C.6.What is the probability that there will be no tools in the system?

Accepted Answer

A) Less than or equal to 0.09 
B) Greater than 0.09 but less than or equal to 0.13 
C) Greater than 0.13 but less than or equal to 0.17 
D) Greater than 0.17 
A) Less than or equal to 0.09 
B) Greater than 0.09 but less than or equal to 0.13 
C) Greater than 0.13 but less than or equal to 0.17 
D) Greater than 0.17

Question 11

In the single-server model,

Accepted Answer

A) the service time of a customer is most often described by an exponential distribution. 
B) the service time depends on the number of customers in the system as long as there is at least one customer in the waiting line. 
C) the mean of the service-time distribution must be as great as the target service time for a feasible solution. 
D) service times are always constant to avoid large waiting lines. 
A) the service time of a customer is most often described by an exponential distribution. 
B) the service time depends on the number of customers in the system as long as there is at least one customer in the waiting line. 
C) the mean of the service-time distribution must be as great as the target service time for a feasible solution. 
D) service times are always constant to avoid large waiting lines.

Question 12

Customers arrive at the local grocery store every 30 seconds on average.Thirty percent of these customers spend an average of 15 minutes shopping and purchase 10 items or less.These lucky customers go to the express line where they enjoy an average checkout time of 5 minutes.Customers that don't meet the express line criterion average 40 minutes in the store and go to checkout line #2 where they spend an average of 10 minutes checking out.How many people are shopping at any given time?

Accepted Answer

A) Less than or equal to 35 
B) Greater than 35 but less than or equal to 70 
C) Greater than 70 but less than or equal to 105 
D) Greater than 105 
A) Less than or equal to 35 
B) Greater than 35 but less than or equal to 70 
C) Greater than 70 but less than or equal to 105 
D) Greater than 105

Question 13

Scenario C.3
Customers arrive at the one remaining full-service gas station in the country at the rate of 45 per minute and are served by the first available of three pump jockeys who can dole out gas and check oil at the rate of 20 customers per minute.Both service and interarrival times are governed by the exponential distribution.The probability that no pump jockey is busy is 0.0748.
-Use the information in Scenario C.3.What is the average number of customers in line?

Accepted Answer

A) Fewer than or equal to 2.0 
B) Greater than 2.0 but fewer than or equal to 3.0 
C) Greater than 3.0 but fewer than or equal to 4.0 
D) Greater than 4.0 
A) Fewer than or equal to 2.0 
B) Greater than 2.0 but fewer than or equal to 3.0 
C) Greater than 3.0 but fewer than or equal to 4.0 
D) Greater than 4.0

Question 14

With a single-server model,increasing the capital-to-labor ratio will most likely

Accepted Answer

A) increase the utilization of the server. 
B) have no effect on the operating characteristics because they are affected only by work-methods changes. 
C) decrease the probability that there are zero customers in the system at any time. 
D) decrease the average number of customers in the waiting line. 
A) increase the utilization of the server. 
B) have no effect on the operating characteristics because they are affected only by work-methods changes. 
C) decrease the probability that there are zero customers in the system at any time. 
D) decrease the average number of customers in the waiting line.

Question 15

Scenario C.2
Weary travelers arrive at Will Rogers International Airport,pick up their luggage,stumble to their cars,and proceed to the parking lot attendant to pay for their parking.Traveler interarrival times are exponentially distributed,as are the service times of the attendant.On average,travelers arrive every 25 seconds.The attendant can process three travelers per minute.
-Use the information in Scenario C.2.What is the average number of customers in the system?

Accepted Answer

A) Fewer than or equal to 3.0 
B) Greater than 3.0 but fewer than or equal to 5.0 
C) Greater than 5.0 but fewer than or equal to 7.0 
D) Greater than 7.0 
A) Fewer than or equal to 3.0 
B) Greater than 3.0 but fewer than or equal to 5.0 
C) Greater than 5.0 but fewer than or equal to 7.0 
D) Greater than 7.0

Question 16

In order to have equivalent performance on average waiting time in a single server model,an increase in interarrival time must be accompanied by

Accepted Answer

A) an increase in μ. 
B) an increase in the number of servers. 
C) an increase in the number of channels. 
D) an increase in the line length. 
A) an increase in μ. 
B) an increase in the number of servers. 
C) an increase in the number of channels. 
D) an increase in the line length.

Question 17

An automatic,drive-through car wash is an example of a

Accepted Answer

A) single-channel,single-phase arrangement. 
B) single-channel,multiple-phase arrangement. 
C) multiple-channel,single-phase arrangement. 
D) multiple-channel,multiple-phase arrangement. 
A) single-channel,single-phase arrangement. 
B) single-channel,multiple-phase arrangement. 
C) multiple-channel,single-phase arrangement. 
D) multiple-channel,multiple-phase arrangement.

Question 18

Scenario C.5
A trucking firm has five trucks that each requires service at an average rate of once every 50 hours,according to an exponential distribution.The firm has a mechanic who needs five hours to complete the average job with exponential service times.
-Use the information in Scenario C.5.What is the average number of trucks waiting for service?

Accepted Answer

A) Fewer than or equal to 0.10 
B) Greater than 0.10 but fewer than or equal to 0.14 
C) Greater than 0.14 but fewer than or equal to 0.18 
D) Greater than 0.18 
A) Fewer than or equal to 0.10 
B) Greater than 0.10 but fewer than or equal to 0.14 
C) Greater than 0.14 but fewer than or equal to 0.18 
D) Greater than 0.18

Question 19

An operations manager organizes a process improvement team and the resulting process has a lower μ.Which statement is the best description of this change?

Accepted Answer

A) Arrival rate has fallen. 
B) There are fewer phases in the new system. 
C) Interarrival time has fallen. 
D) Server efficiency has improved. 
A) Arrival rate has fallen. 
B) There are fewer phases in the new system. 
C) Interarrival time has fallen. 
D) Server efficiency has improved.

Question 20

Scenario C.4
Customers arrive at a ticket counter at the rate of 50 customers per hour,according to a Poisson distribution.There are three ticket agents.Customers select the first available agent from one line.Each agent can process 20 customers per hour with exponential service times.
-Use the information in Scenario C.4.What is the average number of customers waiting in line for service?

Accepted Answer

A) Fewer than or equal to four 
B) Greater than four but fewer than or equal to 4.5 
C) Greater than 4.5 but fewer than or equal to five 
D) Greater than five 
A) Fewer than or equal to four 
B) Greater than four but fewer than or equal to 4.5 
C) Greater than 4.5 but fewer than or equal to five 
D) Greater than five

Waiting lines cannot develop if the time to process a customer is constant.

A super computer-accessory discount store often has customers who leave the checkout line before being served because of excessive waiting times.The store has a(n)

Customers arrive according to a Poisson distribution.The average number of customer arrivals per hour is six.The probability that four customers will arrive in the next three hours is

Customers arrive according to a Poisson distribution.The average number of customer arrivals per hour is three.The probability that four customers will arrive in the next two hours is

The mean of the Poisson distribution is equal to its standard deviation.

The production rate has been steady at 20 units per hour.The average work-in-process inventory at this station is 15 units.What is the average lead time through this manufacturing station?

In the single-server model,

With a single-server model,increasing the capital-to-labor ratio will most likely

In order to have equivalent performance on average waiting time in a single server model,an increase in interarrival time must be accompanied by

An automatic,drive-through car wash is an example of a

An operations manager organizes a process improvement team and the resulting process has a lower μ.Which statement is the best description of this change?

Creating Customer Value Through Operations

Supply Chain Management

Process Configuration

Capacity

Inventory Management

Quality and Process Improvement

Lean Systems

Managing Projects

Location and Layout

Managing Demand and Forecasting

Operations Planning and Scheduling

Resource Planning

Decision Making

Financial Analysis

Work Measurement

Learning Curve Analysis

Computer-Integrated Manufacturing

Acceptance Sampling Plans

Simulation

Special Inventory Models

Linear Programming

Filters

Exam 13: Waiting Lines

Waiting lines cannot develop if the time to process a customer is constant.

A super computer-accessory discount store often has customers who leave the checkout line before being served because of excessive waiting times.The store has a(n)

Customers arrive according to a Poisson distribution.The average number of customer arrivals per hour is six.The probability that four customers will arrive in the next three hours is

Customers arrive according to a Poisson distribution.The average number of customer arrivals per hour is three.The probability that four customers will arrive in the next two hours is

The mean of the Poisson distribution is equal to its standard deviation.

The production rate has been steady at 20 units per hour.The average work-in-process inventory at this station is 15 units.What is the average lead time through this manufacturing station?

In the single-server model,

With a single-server model,increasing the capital-to-labor ratio will most likely

In order to have equivalent performance on average waiting time in a single server model,an increase in interarrival time must be accompanied by

An automatic,drive-through car wash is an example of a

An operations manager organizes a process improvement team and the resulting process has a lower μ.Which statement is the best description of this change?

Creating Customer Value Through Operations

Supply Chain Management

Process Configuration

Capacity

Inventory Management

Quality and Process Improvement

Lean Systems

Managing Projects

Location and Layout

Managing Demand and Forecasting

Operations Planning and Scheduling

Resource Planning

Decision Making

Financial Analysis

Work Measurement

Learning Curve Analysis

Computer-Integrated Manufacturing

Acceptance Sampling Plans

Simulation

Special Inventory Models

Linear Programming

Filters