NEW ISYE6644 MIDTERM 2
QUESTIONS WITH ANSWERS
VERIFIED BY EXPERTS 2024
UPDATED
How do you access SMART demos - CORRECT ANSWER>>>>Libraries > Documents
> Rockwell Software > Arena
What are some important Transfer Panel Modules and what do they do - CORRECT
ANSWER>>>>Station - Somewhere you can go
Route - Tells you where you're going. Similar to Connect except it takes time
Enter - General way to get into a Station
Leave - General way to depart a Station
What is a Sequence s/s used for - CORRECT ANSWER>>>>Allows each type of
customer to follow a different path through the system (station to station)
What are advanced sets - CORRECT ANSWER>>>>Found in advanced process panel,
used for crazy types of sets e.g. sets of sequences. Think of it as a vector
What are different ways you can travel between stations? - CORRECT
ANSWER>>>>Resource (e.g. an assistant) - Seize-Release
Transporter (e.g. a car) - Request-Free, requires Distance Set
Conveyor - Access-Exit, requires a Segment Set
What are the desired properties of the algorithm that produces PRNs? - CORRECT
ANSWER>>>>Output appears to be iid Unif(0,1)
Very Fast
Ability to reproduce any sequence it generates
What are some lousy generators? - CORRECT ANSWER>>>>Random devices
Random number tables
Mid-square method (square a number and take the middle parts)
Fibonacci and Additive Congruential Generators (Xi = Xi-1 + Xi-2)mod m)
What is a full period generator? - CORRECT ANSWER>>>>An LCG with cycle length
m (generally a good thing)
,What can go wrong with LCGs? - CORRECT ANSWER>>>>Some are not full period
Some produce very non-random output
If m is small (< 2 bil) you'll get quick cycling
Even if m is big, some problems can arise (RANDU)
What are some other really good combined generator? - CORRECT
ANSWER>>>>L'Ecuyer with a cycle length of 2^191
Matsumoto and Nishimura's Mersenne Twister with period of 2^19937 - 1
What tests do we perform on PRNs? - CORRECT ANSWER>>>>Goodness-of-fit tests -
are the PRN's approx Unif(0,1)?
Independence tests - are the PRN's approximately independent?
TRUE or FALSE? You can pre-assign a service time as an attribute before you actually
get to the server that you'll be using. - CORRECT ANSWER>>>>True
TRUE or FALSE? If you have Create module generating one-at-a-time customer
arrivals, then it is not possible to use a different Create module with 4-at-a-time
customer arrivals. - CORRECT ANSWER>>>>False
TRUE or FALSE? Fake customers can be used to schedule machine breakdowns, keep
track of which time period the simulation is currently in, and carry out other duties not
associated with actual customers. - CORRECT ANSWER>>>>True
Which module/spreadsheet is NOT in the Advanced Process panel? - CORRECT
ANSWER>>>>Process Module. This is in the Basic Process panel.
Why are things like Seize, Delay, Release in multiple templates? - CORRECT
ANSWER>>>>The Process module does not allow us to use Seize, Delay, Release
with sufficient generality.
TRUE or FALSE? You can schedule failures to occur after a random number of
customers have used a resource or after a random amount of time has passed. -
CORRECT ANSWER>>>>True
TRUE or FALSE? You are only allowed to schedule one type of failure for a particular
resource. - CORRECT ANSWER>>>>False
Which block is NOT in the Blocks template? - CORRECT ANSWER>>>>Process block.
There is no such thing. However, the Process module is in the Basic Process panel.
TRUE or FALSE? The Queue block can connect up to the Seize module from the
, Advanced Process template. - CORRECT ANSWER>>>>False
Which kinds of sets are allowed? - CORRECT ANSWER>>>>Resources set, counter
set, entity type set, entity picture set
TRUE or FALSE? It is possible for the resource Joey to be a member of three different
resource sets. - CORRECT ANSWER>>>>True
TRUE or FALSE? For easy display and organizational purposes, our Call Center
simulation is divided into several submodels. - CORRECT ANSWER>>>>True
TRUE or FALSE? The customer arrival pattern for our Call Center changes over the day
and is therefore modeled as a nonhomogeneous Poisson proces. - CORRECT
ANSWER>>>>True
TRUE or FALSE? All of the Tech Support servers for our Call Center are equally skilled
and have the same concurrent work schedules. - CORRECT ANSWER>>>>False
TRUE or FALSE. In our Call Center demo, fake customers are used to update a
variable that keeps track of the period of the day. - CORRECT ANSWER>>>>True
Consider our Call Center demo. What is the following Seize request asking for? Set,
Product 1, 1, Preferred Order, Agent - CORRECT ANSWER>>>>Grab one server from
the set Product 1 in the order listed when the set was defined, and store that guy's
identity int he attribute Agent.
TRUE or FALSE. In our inventory demo, fake customers are used to initiate a periodic
inventory review. - CORRECT ANSWER>>>>True
Consider the Arena expression DISC(0.3,1,0.5,3,1.0,6) which is a discrete random
variable. What is the random variable's expected value? - CORRECT
ANSWER>>>>(0.3)(1) + (0.5-0.3)(3) + (1.0-0.5)(6) = 3.9
Consider a vanilla (s,S) = (5,12) inventory policy. If my inventory slips to 3, how many
items do I order? - CORRECT ANSWER>>>>9.
Since 3<s, we order S-3 = 9
TRUE or FALSE? It's perfectly OK for a customer to go from server 1 to server 2 and
then back to server 1. - CORRECT ANSWER>>>>True
TRUE or FALSE? Crazy stuff can happen if you start fooling around with multiple server
visits, service priorities, and server times. - CORRECT ANSWER>>>>True
QUESTIONS WITH ANSWERS
VERIFIED BY EXPERTS 2024
UPDATED
How do you access SMART demos - CORRECT ANSWER>>>>Libraries > Documents
> Rockwell Software > Arena
What are some important Transfer Panel Modules and what do they do - CORRECT
ANSWER>>>>Station - Somewhere you can go
Route - Tells you where you're going. Similar to Connect except it takes time
Enter - General way to get into a Station
Leave - General way to depart a Station
What is a Sequence s/s used for - CORRECT ANSWER>>>>Allows each type of
customer to follow a different path through the system (station to station)
What are advanced sets - CORRECT ANSWER>>>>Found in advanced process panel,
used for crazy types of sets e.g. sets of sequences. Think of it as a vector
What are different ways you can travel between stations? - CORRECT
ANSWER>>>>Resource (e.g. an assistant) - Seize-Release
Transporter (e.g. a car) - Request-Free, requires Distance Set
Conveyor - Access-Exit, requires a Segment Set
What are the desired properties of the algorithm that produces PRNs? - CORRECT
ANSWER>>>>Output appears to be iid Unif(0,1)
Very Fast
Ability to reproduce any sequence it generates
What are some lousy generators? - CORRECT ANSWER>>>>Random devices
Random number tables
Mid-square method (square a number and take the middle parts)
Fibonacci and Additive Congruential Generators (Xi = Xi-1 + Xi-2)mod m)
What is a full period generator? - CORRECT ANSWER>>>>An LCG with cycle length
m (generally a good thing)
,What can go wrong with LCGs? - CORRECT ANSWER>>>>Some are not full period
Some produce very non-random output
If m is small (< 2 bil) you'll get quick cycling
Even if m is big, some problems can arise (RANDU)
What are some other really good combined generator? - CORRECT
ANSWER>>>>L'Ecuyer with a cycle length of 2^191
Matsumoto and Nishimura's Mersenne Twister with period of 2^19937 - 1
What tests do we perform on PRNs? - CORRECT ANSWER>>>>Goodness-of-fit tests -
are the PRN's approx Unif(0,1)?
Independence tests - are the PRN's approximately independent?
TRUE or FALSE? You can pre-assign a service time as an attribute before you actually
get to the server that you'll be using. - CORRECT ANSWER>>>>True
TRUE or FALSE? If you have Create module generating one-at-a-time customer
arrivals, then it is not possible to use a different Create module with 4-at-a-time
customer arrivals. - CORRECT ANSWER>>>>False
TRUE or FALSE? Fake customers can be used to schedule machine breakdowns, keep
track of which time period the simulation is currently in, and carry out other duties not
associated with actual customers. - CORRECT ANSWER>>>>True
Which module/spreadsheet is NOT in the Advanced Process panel? - CORRECT
ANSWER>>>>Process Module. This is in the Basic Process panel.
Why are things like Seize, Delay, Release in multiple templates? - CORRECT
ANSWER>>>>The Process module does not allow us to use Seize, Delay, Release
with sufficient generality.
TRUE or FALSE? You can schedule failures to occur after a random number of
customers have used a resource or after a random amount of time has passed. -
CORRECT ANSWER>>>>True
TRUE or FALSE? You are only allowed to schedule one type of failure for a particular
resource. - CORRECT ANSWER>>>>False
Which block is NOT in the Blocks template? - CORRECT ANSWER>>>>Process block.
There is no such thing. However, the Process module is in the Basic Process panel.
TRUE or FALSE? The Queue block can connect up to the Seize module from the
, Advanced Process template. - CORRECT ANSWER>>>>False
Which kinds of sets are allowed? - CORRECT ANSWER>>>>Resources set, counter
set, entity type set, entity picture set
TRUE or FALSE? It is possible for the resource Joey to be a member of three different
resource sets. - CORRECT ANSWER>>>>True
TRUE or FALSE? For easy display and organizational purposes, our Call Center
simulation is divided into several submodels. - CORRECT ANSWER>>>>True
TRUE or FALSE? The customer arrival pattern for our Call Center changes over the day
and is therefore modeled as a nonhomogeneous Poisson proces. - CORRECT
ANSWER>>>>True
TRUE or FALSE? All of the Tech Support servers for our Call Center are equally skilled
and have the same concurrent work schedules. - CORRECT ANSWER>>>>False
TRUE or FALSE. In our Call Center demo, fake customers are used to update a
variable that keeps track of the period of the day. - CORRECT ANSWER>>>>True
Consider our Call Center demo. What is the following Seize request asking for? Set,
Product 1, 1, Preferred Order, Agent - CORRECT ANSWER>>>>Grab one server from
the set Product 1 in the order listed when the set was defined, and store that guy's
identity int he attribute Agent.
TRUE or FALSE. In our inventory demo, fake customers are used to initiate a periodic
inventory review. - CORRECT ANSWER>>>>True
Consider the Arena expression DISC(0.3,1,0.5,3,1.0,6) which is a discrete random
variable. What is the random variable's expected value? - CORRECT
ANSWER>>>>(0.3)(1) + (0.5-0.3)(3) + (1.0-0.5)(6) = 3.9
Consider a vanilla (s,S) = (5,12) inventory policy. If my inventory slips to 3, how many
items do I order? - CORRECT ANSWER>>>>9.
Since 3<s, we order S-3 = 9
TRUE or FALSE? It's perfectly OK for a customer to go from server 1 to server 2 and
then back to server 1. - CORRECT ANSWER>>>>True
TRUE or FALSE? Crazy stuff can happen if you start fooling around with multiple server
visits, service priorities, and server times. - CORRECT ANSWER>>>>True
