1
FUNDAMENTALS & PURPOSE OF TAB (Q1–15)
1. What is the primary purpose of Test, Adjust, and Balance (TAB) work?
A. To install new HVAC equipment
B. To ensure systems perform as intended by the design engineer
C. To increase equipment costs
D. To reduce building occupancy
Answer: B — TAB verifies and adjusts HVAC systems so they operate according to design
specifications for comfort and efficiency .
2. What are the three primary activities of TAB?
A. Testing, Adjusting, Balancing
B. Testing, Auditing, Billing
C. Tuning, Aligning, Bolting
D. Testing, Analyzing, Building
Answer: A — TAB stands for Testing, Adjusting, and Balancing .
3. What is the primary goal of air and water balancing?
A. Increase system horsepower
B. Ensure design airflow and waterflow are achieved
C. Reduce equipment manufacturing costs
D. Eliminate all maintenance
Answer: B — The goal is to verify and adjust systems so airflow and waterflow match design
specifications .
4. What is a "deficiency" in a TAB report?
A. A successful system operation
B. A deviation from design or standards requiring correction
C. A minor cosmetic issue
D. Completion of project scope
Answer: B — Deficiencies are conditions preventing the system from achieving design
balance .
5. Why is proper balancing of HVAC systems important?
A. It increases equipment costs
B. It improves energy efficiency and occupant comfort
C. It increases noise levels
D. It reduces system lifespan
Answer: B — Proper balancing ensures efficient operation and comfortable conditions .
6. What is the "least possible resistance" principle in TAB?
A. Maximizing system resistance
B. Meeting design objectives while imposing the least resistance on the system
C. Eliminating all resistance
, 2
D. Increasing resistance to improve airflow
Answer: B — Systems should be balanced to meet design objectives while imposing the
least possible resistance .
7. What is preliminary TAB work?
A. Installing new equipment
B. Planning and inspecting systems before testing begins
C. Finalizing the TAB report
D. Designing the HVAC system
Answer: B — Preliminary procedures include planning, data procurement, and system
inspection before testing .
8. What condition can negatively affect TAB accuracy?
A. Proper instrument calibration
B. Stable system operation
C. Turbulent airflow at measurement points
D. Standardized duct sizing
Answer: C — Turbulent airflow can distort measurements and reduce accuracy .
9. What is the purpose of a system-readiness check?
A. Verify the system is installed and ready for TAB work
B. Verify the contractor has been paid
C. Verify building occupancy
D. Verify equipment is turned off
Answer: A — Readiness checks verify installation, operation, and accessibility before testing
.
10. Which of the following is a prerequisite for TAB work?
A. All equipment must be installed and operational
B. Building must be fully occupied
C. Outdoor temperature must be below freezing
D. All financial transactions must be complete
Answer: A — Prerequisite inspection ensures the system is ready for testing .
11. What does "TAB" verify in terms of energy use?
A. That the system uses maximum energy
B. That the system operates with minimum expenditure of energy
C. That the system uses no energy
D. That energy costs are irrelevant
Answer: B — TAB ensures systems perform with the least energy expenditure while meeting
design requirements .
12. What is a constant volume system in TAB?
A. A system with varying airflow
, 3
B. A system with constant airflow
C. A system with no airflow
D. A system only for heating
Answer: B — Constant volume systems maintain constant airflow.
13. What is a VAV system?
A. Variable Air Volume system with airflow control
B. Vacuum Air Valve system
C. Ventilation Alarm Valve system
D. Voltage Amplifier Device
Answer: A — VAV systems use terminal units to control airflow to zones .
14. When balancing a VAV system, at what conditions should measurements be taken?
A. Only at minimum airflow
B. At maximum airflow, full cooling, and minimum airflow, full heating
C. Only at design flow
D. Only at night
Answer: B — VAV systems are balanced at extreme conditions .
15. What is the purpose of a TAB report?
A. To document actual system performance and note deficiencies
B. To advertise the TAB agency
C. To replace design drawings
D. To list employee names
Answer: A — The report is a complete record of system performance, conditions, and
deviations .
INSTRUMENTS & MEASUREMENT (Q16–35)
16. Which instrument is commonly used to measure air velocity in ducts?
A. Manometer
B. Anemometer
C. Thermometer
D. Hygrometer
Answer: B — An anemometer measures air velocity in ducts .
17. What does a Pitot tube measure?
A. Static pressure only
B. Total and static pressure
C. Temperature differential
D. Humidity levels
FUNDAMENTALS & PURPOSE OF TAB (Q1–15)
1. What is the primary purpose of Test, Adjust, and Balance (TAB) work?
A. To install new HVAC equipment
B. To ensure systems perform as intended by the design engineer
C. To increase equipment costs
D. To reduce building occupancy
Answer: B — TAB verifies and adjusts HVAC systems so they operate according to design
specifications for comfort and efficiency .
2. What are the three primary activities of TAB?
A. Testing, Adjusting, Balancing
B. Testing, Auditing, Billing
C. Tuning, Aligning, Bolting
D. Testing, Analyzing, Building
Answer: A — TAB stands for Testing, Adjusting, and Balancing .
3. What is the primary goal of air and water balancing?
A. Increase system horsepower
B. Ensure design airflow and waterflow are achieved
C. Reduce equipment manufacturing costs
D. Eliminate all maintenance
Answer: B — The goal is to verify and adjust systems so airflow and waterflow match design
specifications .
4. What is a "deficiency" in a TAB report?
A. A successful system operation
B. A deviation from design or standards requiring correction
C. A minor cosmetic issue
D. Completion of project scope
Answer: B — Deficiencies are conditions preventing the system from achieving design
balance .
5. Why is proper balancing of HVAC systems important?
A. It increases equipment costs
B. It improves energy efficiency and occupant comfort
C. It increases noise levels
D. It reduces system lifespan
Answer: B — Proper balancing ensures efficient operation and comfortable conditions .
6. What is the "least possible resistance" principle in TAB?
A. Maximizing system resistance
B. Meeting design objectives while imposing the least resistance on the system
C. Eliminating all resistance
, 2
D. Increasing resistance to improve airflow
Answer: B — Systems should be balanced to meet design objectives while imposing the
least possible resistance .
7. What is preliminary TAB work?
A. Installing new equipment
B. Planning and inspecting systems before testing begins
C. Finalizing the TAB report
D. Designing the HVAC system
Answer: B — Preliminary procedures include planning, data procurement, and system
inspection before testing .
8. What condition can negatively affect TAB accuracy?
A. Proper instrument calibration
B. Stable system operation
C. Turbulent airflow at measurement points
D. Standardized duct sizing
Answer: C — Turbulent airflow can distort measurements and reduce accuracy .
9. What is the purpose of a system-readiness check?
A. Verify the system is installed and ready for TAB work
B. Verify the contractor has been paid
C. Verify building occupancy
D. Verify equipment is turned off
Answer: A — Readiness checks verify installation, operation, and accessibility before testing
.
10. Which of the following is a prerequisite for TAB work?
A. All equipment must be installed and operational
B. Building must be fully occupied
C. Outdoor temperature must be below freezing
D. All financial transactions must be complete
Answer: A — Prerequisite inspection ensures the system is ready for testing .
11. What does "TAB" verify in terms of energy use?
A. That the system uses maximum energy
B. That the system operates with minimum expenditure of energy
C. That the system uses no energy
D. That energy costs are irrelevant
Answer: B — TAB ensures systems perform with the least energy expenditure while meeting
design requirements .
12. What is a constant volume system in TAB?
A. A system with varying airflow
, 3
B. A system with constant airflow
C. A system with no airflow
D. A system only for heating
Answer: B — Constant volume systems maintain constant airflow.
13. What is a VAV system?
A. Variable Air Volume system with airflow control
B. Vacuum Air Valve system
C. Ventilation Alarm Valve system
D. Voltage Amplifier Device
Answer: A — VAV systems use terminal units to control airflow to zones .
14. When balancing a VAV system, at what conditions should measurements be taken?
A. Only at minimum airflow
B. At maximum airflow, full cooling, and minimum airflow, full heating
C. Only at design flow
D. Only at night
Answer: B — VAV systems are balanced at extreme conditions .
15. What is the purpose of a TAB report?
A. To document actual system performance and note deficiencies
B. To advertise the TAB agency
C. To replace design drawings
D. To list employee names
Answer: A — The report is a complete record of system performance, conditions, and
deviations .
INSTRUMENTS & MEASUREMENT (Q16–35)
16. Which instrument is commonly used to measure air velocity in ducts?
A. Manometer
B. Anemometer
C. Thermometer
D. Hygrometer
Answer: B — An anemometer measures air velocity in ducts .
17. What does a Pitot tube measure?
A. Static pressure only
B. Total and static pressure
C. Temperature differential
D. Humidity levels
