SIMULATION LESSON 1 EXAM
QUESTIONS AND ANSWERS
System - Correct Answers -A collection of entities that act and interact together toward
some logical end. Example system --an airfield's operations, entities--tower, aircraft, and
ground support equipment. In practice, what is meant by "the system" depends on the
objects of a particular study. Example: system may only be the control tower operations
Average waiting time - Correct Answers -Average waiting time of parts in queue (review
handout)
(1) N = no. of parts leaving queue
(2) WQi = waiting time in queue of ith part
(3) Know: WQ1 = 0 (why?)
(4) N > 1 (why?)
Utilization - Correct Answers -Utilization of the machine (proportion of time the machine
is busy) review handout
Mechanistic Simulation - Correct Answers -(1) Individual operations (arrivals, service
times) will occur exactly as in reality. (2) Movements, changes occur at the right "time,"
in the right order. (3) Different pieces interact. (4) Install "observers" to get output
performance measures
Boundary - Correct Answers -like a scope, defined prior to modeling.
Endogenous Variables - Correct Answers -(1) Internal to model and a function of
exogenous variables
Example: aircraft service time at Wright-Pat
Exogenous Variables - Correct Answers -(1) External to model and exist independent of
model
(2) Controllable or Uncontrollable
Example (uncontrollable): number of aircraft making initial contact to tower per hour
Example (controllable): number of civilian aircraft passing through airspace per hour
Entities - Correct Answers -(1) "Players" that move around, change status, affect and
are affected by other entities,
(2) Dynamic objects — get created, move around, leave (maybe)
(3) Usually represent "real" things
(4) Our model: entities are the parts
(5) Can have "fake" entities for modeling "tricks"
QUESTIONS AND ANSWERS
System - Correct Answers -A collection of entities that act and interact together toward
some logical end. Example system --an airfield's operations, entities--tower, aircraft, and
ground support equipment. In practice, what is meant by "the system" depends on the
objects of a particular study. Example: system may only be the control tower operations
Average waiting time - Correct Answers -Average waiting time of parts in queue (review
handout)
(1) N = no. of parts leaving queue
(2) WQi = waiting time in queue of ith part
(3) Know: WQ1 = 0 (why?)
(4) N > 1 (why?)
Utilization - Correct Answers -Utilization of the machine (proportion of time the machine
is busy) review handout
Mechanistic Simulation - Correct Answers -(1) Individual operations (arrivals, service
times) will occur exactly as in reality. (2) Movements, changes occur at the right "time,"
in the right order. (3) Different pieces interact. (4) Install "observers" to get output
performance measures
Boundary - Correct Answers -like a scope, defined prior to modeling.
Endogenous Variables - Correct Answers -(1) Internal to model and a function of
exogenous variables
Example: aircraft service time at Wright-Pat
Exogenous Variables - Correct Answers -(1) External to model and exist independent of
model
(2) Controllable or Uncontrollable
Example (uncontrollable): number of aircraft making initial contact to tower per hour
Example (controllable): number of civilian aircraft passing through airspace per hour
Entities - Correct Answers -(1) "Players" that move around, change status, affect and
are affected by other entities,
(2) Dynamic objects — get created, move around, leave (maybe)
(3) Usually represent "real" things
(4) Our model: entities are the parts
(5) Can have "fake" entities for modeling "tricks"
