ASHRAE HVAC Systems Testing and Balancing Exam 200 Practice Questions With
Correct Answer .
ASHRAE HVAC Systems Testing and Balancing Exam Practice Questions
210 Multiple Choice Questions with Answers and Rationales
Section 1: Fundamentals of Testing, Adjusting, and Balancing (Questions 1-30)
1. In HVAC testing, adjusting, and balancing (TAB), what is the primary objective
of air system balancing in a building HVAC installation?
A. To maximize fan horsepower regardless of demand
B. To ensure design airflow is delivered to each space as specified
C. To increase static pressure beyond design limits
D. To reduce duct size after installation
Answer: B
Rationale: The primary goal of air system balancing is to verify and adjust airflow
so that each terminal unit or space receives the designed airflow rates for proper
comfort, efficiency, and system performance. Maximizing fan horsepower or
increasing static pressure would be counterproductive .
,2. Which instrument is most commonly used to measure air velocity in duct
traverses during TAB procedures?
A. Thermometer
B. Hygrometer
C. Barometer
D. Pitot tube
Answer: D
Rationale: A Pitot tube is widely used in duct traverses because it measures
velocity pressure, which can be converted to air velocity for airflow calculations.
Thermometers measure temperature, hygrometers measure humidity, and
barometers measure atmospheric pressure .
3. In hydronic balancing, what is the main function of a balancing valve?
A. Increase pump efficiency
B. Eliminate air from piping
C. Regulate and measure flow rates in piping systems
,D. Reduce water temperature losses
Answer: C
Rationale: Balancing valves are used to control and verify water flow rates in
hydronic systems to ensure proper distribution according to design requirements
.
4. What is the first step in the HVAC TAB process according to standard practice?
A. Adjust terminal devices
B. Measure diffuser airflow
C. Verify system readiness and pre-functional checks
D. Balance pumps
Answer: C
Rationale: The first step in TAB is verifying that the system is complete,
operational, and ready for testing, ensuring no mechanical or control deficiencies
exist .
, 5. Which law is used to describe the relationship between fan speed and airflow
in HVAC systems?
A. Ohm's Law
B. Boyle's Law
C. Newton's Law
D. Fan Affinity Laws
Answer: D
Rationale: Fan affinity laws describe how changes in fan speed affect airflow,
pressure, and power consumption in HVAC systems. Fan Law #1 states that CFM is
directly proportional to RPM .
6. What does duct traverse measurement primarily determine?
A. Refrigerant charge
B. Electrical load
C. Average air velocity and volumetric flow rate
Correct Answer .
ASHRAE HVAC Systems Testing and Balancing Exam Practice Questions
210 Multiple Choice Questions with Answers and Rationales
Section 1: Fundamentals of Testing, Adjusting, and Balancing (Questions 1-30)
1. In HVAC testing, adjusting, and balancing (TAB), what is the primary objective
of air system balancing in a building HVAC installation?
A. To maximize fan horsepower regardless of demand
B. To ensure design airflow is delivered to each space as specified
C. To increase static pressure beyond design limits
D. To reduce duct size after installation
Answer: B
Rationale: The primary goal of air system balancing is to verify and adjust airflow
so that each terminal unit or space receives the designed airflow rates for proper
comfort, efficiency, and system performance. Maximizing fan horsepower or
increasing static pressure would be counterproductive .
,2. Which instrument is most commonly used to measure air velocity in duct
traverses during TAB procedures?
A. Thermometer
B. Hygrometer
C. Barometer
D. Pitot tube
Answer: D
Rationale: A Pitot tube is widely used in duct traverses because it measures
velocity pressure, which can be converted to air velocity for airflow calculations.
Thermometers measure temperature, hygrometers measure humidity, and
barometers measure atmospheric pressure .
3. In hydronic balancing, what is the main function of a balancing valve?
A. Increase pump efficiency
B. Eliminate air from piping
C. Regulate and measure flow rates in piping systems
,D. Reduce water temperature losses
Answer: C
Rationale: Balancing valves are used to control and verify water flow rates in
hydronic systems to ensure proper distribution according to design requirements
.
4. What is the first step in the HVAC TAB process according to standard practice?
A. Adjust terminal devices
B. Measure diffuser airflow
C. Verify system readiness and pre-functional checks
D. Balance pumps
Answer: C
Rationale: The first step in TAB is verifying that the system is complete,
operational, and ready for testing, ensuring no mechanical or control deficiencies
exist .
, 5. Which law is used to describe the relationship between fan speed and airflow
in HVAC systems?
A. Ohm's Law
B. Boyle's Law
C. Newton's Law
D. Fan Affinity Laws
Answer: D
Rationale: Fan affinity laws describe how changes in fan speed affect airflow,
pressure, and power consumption in HVAC systems. Fan Law #1 states that CFM is
directly proportional to RPM .
6. What does duct traverse measurement primarily determine?
A. Refrigerant charge
B. Electrical load
C. Average air velocity and volumetric flow rate
