SIMULATION & MODELING
ISYE 6644 Exam 2
— 2026/2027 A+
Official Exam • Advanced • Application / Analysis Level
A+ QUESTIONS 5 SECTIONS 100%
VERIFIED BALANCED RATIONALES
CATEGORIES
1. Arena Modeling & Discrete-Event Simulation (10 Questions)
2. Random Number & Random Variate Generation (10 Questions)
3. Input Analysis & Distribution Fitting (10 Questions)
4. Output Analysis & Confidence Intervals (10 Questions)
5. Variance Reduction & Comparing Systems (10 Questions)
STUVIAACTUALEXAM
Passing Score: 75% • 1 Mark per Question • Total 50 Marks
, SECTION 1: Arena Modeling & Discrete-Event Simulation
Q1.
A simulation analyst is building an Arena model of a single-server queue. Customers arrive according to an exponential
interarrival distribution and service times are triangular. The analyst wants each customer entity to carry its arrival time so
that system time can be calculated at departure. The most appropriate Arena mechanism is to:
A. Use a global Variable that is overwritten by every new arrival
B. Create an Attribute on the entity, assign the current simulation time (TNOW) at arrival, and later compute TNOW minus
that attribute
C. Store arrival times only in a spreadsheet outside Arena
D. Rely solely on the default Entity Number without recording time
Correct Answer: B
Rationale: Attributes travel with the entity. Assigning TNOW at creation allows accurate sojourn-time calculation for each individual
customer at disposal.
Q2.
In an Arena model of a call center, the analyst needs to route 70% of calls to a regular agent and 30% to a specialist. The
Decide module should be configured as:
A. A 2-way by Chance module with 0.7 probability on the True branch
B. A 2-way by Condition module testing a resource capacity expression
C. An N-way by Condition module with three exit points
D. A single Process module that ignores routing probabilities
Correct Answer: A
Rationale: Probabilistic routing is handled by the Chance option of the Decide module. The stated probabilities match the required 70/30
split.
Q3.
An Arena Resource spreadsheet entry shows a resource named “Nurse” with capacity defined by a Schedule named
“NurseSch.” During a period when the schedule capacity is 0, arriving entities that request the Nurse will:
A. Seize the resource immediately regardless of the schedule
B. Be destroyed by the model automatically
C. Wait in the associated queue until capacity becomes positive according to the schedule
D. Bypass the Process module entirely
Correct Answer: C
Rationale: When scheduled capacity is zero the resource is unavailable; entities accumulate in the queue until the schedule again
provides positive capacity.
Q4.
A modeler wants to collect the time-average number of entities in a particular queue and the average waiting time in that
queue. In Arena these statistics are obtained primarily from:
A. Manual calculation after the run using only the number of entities created
B. A single ASSIGN module that overwrites a variable once
C. The animation speed setting alone
D. The Queue spreadsheet statistics and the automatic Category Overview report
Correct Answer: D
Rationale: Arena automatically tallies queue length and waiting-time statistics when a Queue is defined; these appear in the standard
statistical reports.
ISYE 6644 Exam 2
— 2026/2027 A+
Official Exam • Advanced • Application / Analysis Level
A+ QUESTIONS 5 SECTIONS 100%
VERIFIED BALANCED RATIONALES
CATEGORIES
1. Arena Modeling & Discrete-Event Simulation (10 Questions)
2. Random Number & Random Variate Generation (10 Questions)
3. Input Analysis & Distribution Fitting (10 Questions)
4. Output Analysis & Confidence Intervals (10 Questions)
5. Variance Reduction & Comparing Systems (10 Questions)
STUVIAACTUALEXAM
Passing Score: 75% • 1 Mark per Question • Total 50 Marks
, SECTION 1: Arena Modeling & Discrete-Event Simulation
Q1.
A simulation analyst is building an Arena model of a single-server queue. Customers arrive according to an exponential
interarrival distribution and service times are triangular. The analyst wants each customer entity to carry its arrival time so
that system time can be calculated at departure. The most appropriate Arena mechanism is to:
A. Use a global Variable that is overwritten by every new arrival
B. Create an Attribute on the entity, assign the current simulation time (TNOW) at arrival, and later compute TNOW minus
that attribute
C. Store arrival times only in a spreadsheet outside Arena
D. Rely solely on the default Entity Number without recording time
Correct Answer: B
Rationale: Attributes travel with the entity. Assigning TNOW at creation allows accurate sojourn-time calculation for each individual
customer at disposal.
Q2.
In an Arena model of a call center, the analyst needs to route 70% of calls to a regular agent and 30% to a specialist. The
Decide module should be configured as:
A. A 2-way by Chance module with 0.7 probability on the True branch
B. A 2-way by Condition module testing a resource capacity expression
C. An N-way by Condition module with three exit points
D. A single Process module that ignores routing probabilities
Correct Answer: A
Rationale: Probabilistic routing is handled by the Chance option of the Decide module. The stated probabilities match the required 70/30
split.
Q3.
An Arena Resource spreadsheet entry shows a resource named “Nurse” with capacity defined by a Schedule named
“NurseSch.” During a period when the schedule capacity is 0, arriving entities that request the Nurse will:
A. Seize the resource immediately regardless of the schedule
B. Be destroyed by the model automatically
C. Wait in the associated queue until capacity becomes positive according to the schedule
D. Bypass the Process module entirely
Correct Answer: C
Rationale: When scheduled capacity is zero the resource is unavailable; entities accumulate in the queue until the schedule again
provides positive capacity.
Q4.
A modeler wants to collect the time-average number of entities in a particular queue and the average waiting time in that
queue. In Arena these statistics are obtained primarily from:
A. Manual calculation after the run using only the number of entities created
B. A single ASSIGN module that overwrites a variable once
C. The animation speed setting alone
D. The Queue spreadsheet statistics and the automatic Category Overview report
Correct Answer: D
Rationale: Arena automatically tallies queue length and waiting-time statistics when a Queue is defined; these appear in the standard
statistical reports.
