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

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

Accepted Answer

A) True 
 B)False

Question 3

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 F) All of the above
G) B) and D)

Question 4

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 5

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 6

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 F) A) and E)
G) B) and E)

Question 7

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 F) All of the above
G) B) and E)

Question 8

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 9

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 F) A) and E)
G) B) and E)

Question 10

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 F) B) and C)
G) A) and E)

Question 11

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 F) A) and C)
G) A) and B)

Question 12

The cost of customer waiting is easy to estimate

Accepted Answer

A) True 
 B)False

Question 13

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 F) A) and C)
G) B) and C)

Question 14

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 F) A) and B)
G) All of the above

Question 15

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 F) B) and C)
G) A) and E)

Question 16

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 17

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 18

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 F) C) and D)
G) A) and B)

Question 19

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 F) B) and D)
G) A) and E)

Question 20

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 F) B) and D)
G) B) and C)

Exam 11: Queuing models

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

Correct Answer
verified

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

Correct Answer
verified

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:

Correct Answer
verified

Which of these would increase system utilization?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

The cost of customer waiting is easy to estimate

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 11: Queuing models

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

Which of these would increase system utilization?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The cost of customer waiting is easy to estimate

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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