Question 1

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

Question 2

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 3

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

Accepted Answer

A) True 
 B)False

Question 4

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.F) B) and D)
G) None of the above E

Question 5

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 D)
G) A) and C)

Question 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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.F) All of the above
G) C) and E)

Question 9

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

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

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

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

Question 13

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 B)
G) A) and E)

Question 14

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.F) C) and E)
G) B) and C)

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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 17

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 18

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.F) A) and D)
G) B) and D)

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

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.F) A) and B)
G) B) and D)

Exam 12: Queueing Models

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedE

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedB

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedFalse

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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E

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B

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False

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