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100+ Free ACG CxA Practice Questions

Pass your ACG Certified Commissioning Authority (CxA) exam on the first try — instant access, no signup required.

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58% for the 12-month period ending December 31, 2025 Pass Rate
100+ Questions
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What should be included when closing a warranty-phase commissioning issue?

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2026 Statistics

Key Facts: ACG CxA Exam

125

Exam Questions

ACG CxA Candidate Handbook dated February 17, 2026

4 hr 15 min

Exam Time

ACG CxA Candidate Handbook dated February 17, 2026

10 min

Break

ACG CxA Candidate Handbook dated February 17, 2026

58%

Reported Pass Rate

ACG applying page, 12-month period ending December 31, 2025

1,216

Active CxAs

ACG applying page as of January 1, 2026

24%

Largest Domain

Conducting Commissioning Activities in the ACG CxA competency outline

Use this practice set for the official ACG CxA competency outline from the February 17, 2026 Candidate Handbook. The practice bank mirrors the domain weights exactly across 100 questions: Managing Commissioning Projects 18, Preparing Commissioning Documentation 19, Conducting Commissioning Activities 24, Managing Training Activities 4, Completing Warranty Phase Activities 5, Conducting Existing Building Commissioning 23, and Conducting Ongoing Commissioning 7.

Sample ACG CxA Practice Questions

Try these sample questions to test your ACG CxA exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which role best matches the ACG Certified Commissioning Authority profile?
A.A contractor who self-verifies only the equipment installed by their firm
B.An independent commissioning professional who leads, plans, coordinates, and manages commissioning teams
C.A code official who issues occupancy permits for all building projects
D.A product representative who approves substitutions for a single manufacturer
Explanation: The CxA credential is aimed at independent building commissioning professionals who lead, plan, coordinate, and manage commissioning teams for new and existing buildings. Independence and team leadership are central to the role.
2At project kickoff, what is the CxA's most important first step for aligning commissioning scope?
A.Wait until substantial completion to define acceptance requirements
B.Confirm the owner's project requirements and intended commissioned systems with stakeholders
C.Ask each contractor to decide which systems should be tested
D.Limit commissioning to systems that failed on prior projects
Explanation: The commissioning scope should be anchored in the owner's project requirements, project goals, and agreed systems. Early stakeholder alignment reduces later disputes about deliverables, tests, and acceptance criteria.
3Why should a commissioning plan identify team responsibilities by activity?
A.To replace all contract documents with a CxA-only work plan
B.To make accountability clear for reviews, checklists, testing, issue resolution, and documentation
C.To allow the CxA to perform every installation task personally
D.To eliminate the need for owner participation
Explanation: A useful commissioning plan assigns who prepares, performs, witnesses, approves, and tracks each major activity. Clear responsibilities keep the team coordinated and help manage schedule, budget, and deliverables.
4Which project condition most strongly signals that the CxA should revisit the commissioning scope and budget with the owner?
A.A minor meeting time changes by one hour
B.The owner adds a laboratory exhaust system after the original proposal was approved
C.A contractor submits a standard product data sheet on time
D.The team agrees to use the same meeting agenda format
Explanation: Adding a significant system can change review effort, checklists, FPTs, site visits, reporting, and specialist support. The CxA should communicate scope and budget impacts promptly.
5What is the main purpose of a commissioning kickoff meeting?
A.To certify that all systems already meet the OPR
B.To establish process expectations, communication paths, schedule milestones, roles, and required deliverables
C.To replace contractor coordination meetings for the remainder of the project
D.To negotiate the final construction contract price
Explanation: The kickoff meeting sets the commissioning process in motion by aligning team members around responsibilities, communication, documentation, schedule, and acceptance expectations.
6Which item is most appropriate for a commissioning risk assessment?
A.Identifying systems whose failure would most affect safety, comfort, energy, operations, or owner goals
B.Ranking contractors by how quickly they respond to email
C.Selecting the lowest-cost equipment regardless of performance requirements
D.Avoiding tests on complex systems because they may reveal deficiencies
Explanation: Risk assessment focuses effort where failures would have the greatest consequence or likelihood. It helps tailor reviews, sampling, site observations, and FPT rigor to project priorities.
7A project schedule shows functional performance testing before controls point-to-point verification and TAB completion. What should the CxA do?
A.Proceed because FPTs always find and fix incomplete work faster
B.Recommend resequencing because prerequisite verification is not complete
C.Cancel commissioning for all systems
D.Approve testing if the contractor promises to correct failures later
Explanation: FPTs should generally occur after prerequisites such as installation checks, controls verification, calibration, TAB, startup, and readiness documentation. Testing too early wastes time and obscures true performance.
8When a commissioning issue affects both mechanical controls and electrical power quality, what is the best CxA management action?
A.Assign it only to the mechanical contractor because the symptom appears at an air handler
B.Document the issue, identify affected parties, set action owners, and track resolution through retesting
C.Remove the issue from the log until one contractor accepts responsibility
D.Close the issue when the first proposed explanation is offered
Explanation: Cross-discipline issues require transparent tracking, clear ownership of actions, and verification after corrective work. The CxA manages the process without prematurely assigning unsupported blame.
9Which change most likely requires formal communication to the owner about commissioning deliverables?
A.A team member updates their phone number
B.The project changes from commissioning three air handlers to commissioning an added central plant and smoke control interface
C.The meeting minutes template changes fonts
D.A submittal reviewer asks for bookmarked PDFs
Explanation: A major change in systems and life-safety interfaces can alter CxA effort, deliverables, schedule, specialist needs, and risk. The owner should understand the effect before expectations diverge.
10A design-build contractor asks the CxA to waive all failed tests to protect the turnover date. What response best reflects the CxA role?
A.Waive failures if the contractor says the system is close enough
B.Document the failures, communicate schedule implications, and support a path to correction and verified retesting
C.Delete failed results and test only the easiest modes
D.Stop communicating with the contractor until the owner intervenes
Explanation: The CxA protects the integrity of the process by documenting results and helping the team resolve issues. Schedule pressure does not justify hiding failures or accepting unverified performance.

About the ACG CxA Exam

The ACG Certified Commissioning Authority (CxA) credential is for independent building commissioning professionals who lead, plan, coordinate, and manage commissioning teams for new and existing buildings. The February 17, 2026 Candidate Handbook describes a closed-book examination with 125 multiple-choice questions, a four-hour-and-fifteen-minute testing period plus a 10-minute break, and permission to use a scientific non-programmable calculator. The official competency outline covers managing commissioning projects, preparing commissioning documentation, conducting commissioning activities, managing training, completing warranty activities, conducting existing building commissioning, and conducting ongoing commissioning.

Assessment

125 closed-book multiple-choice questions covering seven competency domains for commissioning professionals who lead, plan, coordinate, and manage commissioning teams for new and existing buildings.

Time Limit

4 hours and 15 minutes plus a 10-minute break

Passing Score

ACG reports a 58% pass rate for the 12-month period ending December 31, 2025; the opened official sources did not state a public scaled passing score.

Exam Fee

See ACG's current applying page and Candidate Handbook for current fees. (Associated Air Balance Council Commissioning Group (ACG))

ACG CxA Exam Content Outline

18%

Managing Commissioning Projects

Independent CxA role, scope, budget, schedule, communication, team coordination, kickoff, risk assessment, owner engagement, acceptance strategy, issue prioritization, and stakeholder reporting.

19%

Preparing Commissioning Documentation

OPR, BOD, CFR, commissioning plans, commissioning specifications, design reviews, submittal reviews, checklists, functional test scripts, pass/fail criteria, reports, systems manuals, and revision control.

24%

Conducting Commissioning Activities

Systems verification checks, startup witnessing, controls verification, TAB readiness, functional performance testing, integrated testing, trend analysis, alarm testing, issue resolution, retesting, IEQ, and energy performance.

4%

Managing Training Activities

Training planning, project-specific content, operations staff attendance, hands-on demonstrations, training records, materials, recordings, and unresolved training gaps.

5%

Completing Warranty Phase Activities

Warranty review, deferred and seasonal testing, recurring comfort or performance issues, post-occupancy trend review, corrective action, retesting, and owner disposition.

23%

Conducting Existing Building Commissioning

EBCx planning, Current Facility Requirements, assessments, utility data, BAS trends, maintenance records, occupant complaints, FIMs, ECMs, implementation, verification, persistence, IEQ, and energy reporting.

7%

Conducting Ongoing Commissioning

Monitoring-based commissioning, fault detection and diagnostics, alarm management, issue accountability, work-order integration, performance metrics, persistence, and executive/operator reporting.

How to Pass the ACG CxA Exam

What You Need to Know

  • Passing score: ACG reports a 58% pass rate for the 12-month period ending December 31, 2025; the opened official sources did not state a public scaled passing score.
  • Assessment: 125 closed-book multiple-choice questions covering seven competency domains for commissioning professionals who lead, plan, coordinate, and manage commissioning teams for new and existing buildings.
  • Time limit: 4 hours and 15 minutes plus a 10-minute break
  • Exam fee: See ACG's current applying page and Candidate Handbook for current fees.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ACG CxA Study Tips from Top Performers

1Memorize the seven official domain weights and use them to allocate study time.
2Practice connecting OPR or CFR requirements to commissioning documentation, field verification, acceptance criteria, and final reports.
3For scenario questions, identify the CxA's process responsibility without taking over design professional or contractor means-and-methods responsibilities.
4Use field scenarios to distinguish readiness checks, startup, functional performance testing, retesting, seasonal testing, and warranty follow-up.
5For EBCx and ongoing commissioning, focus on evidence-based analysis, FIM or ECM prioritization, IEQ and energy balance, persistence, and stakeholder reporting.

Frequently Asked Questions

How many questions are on the ACG CxA exam?

The February 17, 2026 ACG CxA Candidate Handbook states that the examination consists of 125 multiple-choice questions.

How long is the ACG CxA exam?

The supplied Candidate Handbook facts state that candidates have 4 hours and 15 minutes plus a 10-minute break.

Is the ACG CxA exam open book?

No. The supplied Candidate Handbook facts describe the CxA examination as closed book. A scientific non-programmable calculator is permitted.

Who is the ACG CxA certification for?

ACG describes CxA as available to independent building commissioning professionals who lead, plan, coordinate, and manage commissioning teams for new and existing buildings.

What is the reported ACG CxA pass rate?

ACG's applying page reported that for the 12-month period ending December 31, 2025, 145 candidates were approved, 84 passed, and the pass rate was 58%.

What references are listed for CxA preparation?

The supplied official reference list includes ACG Building Systems Commissioning Guideline Part I, ASHRAE Standard 202-2013, ASHRAE Guideline 0-2013, ASHRAE Guideline 1.1-2007, and EMA Energy Management Guideline.