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National Standards for Total System Balance
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Kahoe Test & Balance
Equation Quick Guide
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Registration
Program
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2026 Fall AABC TAB Technology Showcase
TAB Talk Webinars
TAB Journal
TAB Lunch & Learn
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Home
About
Why Specify AABC
Board of Directors
Hall of Fame
Outstanding Service Award
AABC Timeline
Quality Assurance
News & Updates
Join AABC
AABC Member Benefits
Certification
Member Locator
US Members
Canadian Members
International Members
ACG Members
Recruitment
Job Posting
Publications
National Standards for Total System Balance
Technician Training Manual
Kahoe Test & Balance
Equation Quick Guide
AABC Annual Meeting
Registration
Program
Activities
Professional Development
2026 Fall AABC TAB Technology Showcase
TAB Talk Webinars
TAB Journal
TAB Lunch & Learn
Endorsed Training
Connect with AABC
Industry Partners
Industry Partner Benefits
Advertise in TAB Journal
Webinar Sponsorship
Annual Sponsorship Opportunities
Member Portal
Home
About
Why Specify AABC
Board of Directors
Hall of Fame
Outstanding Service Award
AABC Timeline
Quality Assurance
News & Updates
Join AABC
AABC Member Benefits
Certification
Member Locator
US Members
Canadian Members
International Members
ACG Members
Recruitment
Job Posting
Publications
National Standards for Total System Balance
Technician Training Manual
Kahoe Test & Balance
Equation Quick Guide
AABC Annual Meeting
Registration
Program
Activities
Professional Development
2026 Fall AABC TAB Technology Showcase
TAB Talk Webinars
TAB Journal
TAB Lunch & Learn
Endorsed Training
Connect with AABC
Industry Partners
Industry Partner Benefits
Advertise in TAB Journal
Webinar Sponsorship
Annual Sponsorship Opportunities
Member Portal
AABC TAB Talk August 2026 – TAB in the Real World: An Approach to HVAC Systems That Don’t Follow the Rules Quiz
Step
1
of
11
9%
Name
(Required)
First
Last
Email
(Required)
What did the presentation describe as the meaning of “Test” in Test & Balance?
(Required)
Testing flows & Pressures to determine what needs to be balanced.
Testing flows & Pressures and Testing the system to make sure they are ready to be balanced.
Testing systems to be balanced to make sure they are ready to be balanced.
What is the major issue with air balancing air distribution that is added to an existing system without flow values for the existing system?
(Required)
The new air distribution will lower the air flow for every grille in the existing system and the new air distribution grilles will probably not make design flow.
There is no issue the new air distribution should be balanced as usual.
There is no issue the correct procedure is to increase the existing AHU flow by an amount equal to the new air distribution to provide air to the new grilles.
What is one reason a VAV box may have been oversized?
(Required)
Box was installed incorrectly.
Oversized VAV boxes are not a problem because they are calibrated for actual flow conditions.
Owner has requested larger boxes to facilitate future load.
System pressure is much higher than anticipated by the designer.
When over speeding an induction fan motor what is one of the most important items to verify?
(Required)
That the tip speed of the fan wheel is not exceeded.
That the noise from the fan with higher speed is not objectionable.
That the increase in speed increases the motor torque beyond the motor rating.
How should balance valves be sized?
(Required)
Balance valves should be sized on Cv or sized so the balanced position is not near valve close off.
Balance valves are sized to equal the pipe size.
Balance valves are sized on velocity at full flow.
Automatic flow balance valves provide what main characteristic?
(Required)
Total pressure independent flow.
Pre balanced to always provide the correct flow to the coil.
Between the minimum and maximum pressure rating of the spring the valve operates as a pressure independent valve but as a fixed orifice outside of pressure rating.
What is the recommended method to be used to verify auto flow valves are working correctly?
(Required)
Verify that the supply pipe pressure is below the maximum pressure for the valve
Verify that the supply pipe pressure is above the maximum pressure for the valve.
Verify that the supply pipe pressure is within the pressure range of the valve for both the highest pressure and lowest pressure valves.
What is a common reason for some central plant decouplers to be construction incorrectly?
(Required)
Confusion between the pipe diagram and the actual layout in the field where the pipe routing does not resemble the diagram.
Lack of knowledge of the installing pipe fitters.
Lack of knowledge of the designers.
What happens when the decoupler is piped incorrectly and the primary pumps into the decoupler instead of into the chillers?
(Required)
The secondary return water and the primary pump water both flow through the decoupler doubling flow and increasing the system pressure and lowering total flow.
The flow in the decoupler reverses, starving the secondary pumps.
The flow in the decoupler decreases due to competing pump pressure.
What problem do bull head tees cause if pipe velocity is high enough?
(Required)
Bull head tees cause water noise when flowing with enough velocity.
Bull head tee outlet pressure changes substantially limiting flow depending upon the % flow of the branch, disrupting balanced flow to chillers and towers.
Bull head tees cause low pressure flow in the fitting when velocity is high enough.
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