Question 1

Planning for service capacity involves prediction of consumer waiting associated with different levels of capacity.

Accepted Answer

A) True 
 B)False  True

Question 2

In the M/M/1 model the calling population is finite.

Accepted Answer

A) True 
 B)False  False

Question 3

A queuing system is said to be in a transient condition when ________.

Accepted Answer

A)   its parameters change with time
B)   its parameters remain constant
C)   it is still under the influence of the initial state
D)   it grows beyond bound C

Question 4

A system is said to be in a transient state when the values of its governing parameters in this state are expected to change uncontrollably with time.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is not an advantage of using one large computer system to serve an entire university community?

Accepted Answer

A)   Short turnaround time.
B)   Large memory.
C)   Economics of scale in services.
D)   Short wait in queue.

Question 6

In analytical terms, the modern self-serve supermarket would be approximated best by the M /M /c model, where c is the number of servers.

Accepted Answer

A) True 
 B)False

Question 7

In general, for infinite queues, the expected number of people in the system is equal to ________.

Accepted Answer

A)   the average arrival rate minus the average service rate
B)   the expected number in the queue plus the expected number in service
C)   the expected arrival rate times the expected waiting time
D)   A and B

Question 8

In the equation Ls = Lq + ρ, ρ refers to ________.

Accepted Answer

A)   number of servers
B)   traffic density
C)   mean number of customers being served
D)   number of customer that have been served

Question 9

Service capacity decisions have all of the following strategic characteristics, except ________.

Accepted Answer

A)   the decision to invest in capacity will attract competitors
B)   financial investment in capacity must be balanced against the costs of lost sales
C)   inadequate short-term capacity needs can generate customers for the competition
D)   hostile customers can result from inadequate capacity following a marketing campaign

Question 10

For a standard service system to operate over the long run, the servers must be idle part of the time.

Accepted Answer

A) True 
 B)False

Question 11

Analytical queuing models are classified mainly on the basis of the calling population characteristics and the queue discipline.

Accepted Answer

A) True 
 B)False

Question 12

Verification refers to determining whether or not the structure of a simulation model is consistent with the real system.

Accepted Answer

A) True 
 B)False

Question 13

The cost of service capacity is determined by ________.

Accepted Answer

A)   the number of customers waiting
B)   the total number of customers
C)   waiting time
D)   the number of servers on duty

Question 14

Excess capacity is required in a service system because variability in customer arrivals and service times creates idle capacity.

Accepted Answer

A) True 
 B)False

Question 15

A shortcoming of simulation is the use of pseudo-random numbers.

Accepted Answer

A) True 
 B)False

Question 16

A parking lot is a special variation of the ________ queuing model.

Accepted Answer

A)   infinite queue M /G /∞
B)   finite-queue M /M /c
C)   infinite queue M /M /c
D)   finite-queue M /G /1

Question 17

When Xerox Corporation introduced the Model 9200 Duplicating System, the level of service dipped because technical representatives were assigned to territories.

Accepted Answer

A) True 
 B)False

Question 18

For a system to reach steady state, the arrival rate must always be greater than the service rate, i.e., the traffic intensity ρ must always be greater than unity.

Accepted Answer

A) True 
 B)False

Question 19

Reducing the variability either in service time or arrival time can reduce most of the waiting involved for the consumers.

Accepted Answer

A) True 
 B)False

Question 20

Little's Law states that a relationship exists between ________.

Accepted Answer

A)   line length and waiting time
B)   multiple and single queues
C)   waiting in queue and waiting in system
D)   exponential time between arrivals and Poisson arrival rate

Exam 13: Capacity Planning and Queuing Models

Planning for service capacity involves prediction of consumer waiting associated with different levels of capacity.

In the M/M/1 model the calling population is finite.

A queuing system is said to be in a transient condition when ________.

A system is said to be in a transient state when the values of its governing parameters in this state are expected to change uncontrollably with time.

Which of the following is not an advantage of using one large computer system to serve an entire university community?

In analytical terms, the modern self-serve supermarket would be approximated best by the M /M /c model, where c is the number of servers.

In general, for infinite queues, the expected number of people in the system is equal to ________.

In the equation Ls = Lq + ρ, ρ refers to ________.

Service capacity decisions have all of the following strategic characteristics, except ________.

For a standard service system to operate over the long run, the servers must be idle part of the time.

Analytical queuing models are classified mainly on the basis of the calling population characteristics and the queue discipline.

Verification refers to determining whether or not the structure of a simulation model is consistent with the real system.

The cost of service capacity is determined by ________.

Excess capacity is required in a service system because variability in customer arrivals and service times creates idle capacity.

A shortcoming of simulation is the use of pseudo-random numbers.

A parking lot is a special variation of the ________ queuing model.

When Xerox Corporation introduced the Model 9200 Duplicating System, the level of service dipped because technical representatives were assigned to territories.

For a system to reach steady state, the arrival rate must always be greater than the service rate, i.e., the traffic intensity ρ must always be greater than unity.

Reducing the variability either in service time or arrival time can reduce most of the waiting involved for the consumers.

Little's Law states that a relationship exists between ________.