UNIT 75 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
75-1) List 6 types of measurements used to perform TAB procedures.
75-2) List 5 instruments are used in TAB procedures.
Stroboscope, chronometric tachometer, digital tachometer, Digital Multi-Meter,
75-3) Outline the general test and balance procedure for system airflow.
xcollect complete information
xexamine the entire installation
xopen all dampers
75-4) Explain how to measure temperature rise?
75-5) Why is the temperature difference across an air conditioning coil not used to
calculate airflow?
75-6) Explain how to measure airflow using temperature rise.
Measure the system temperature rise.
75-7) How do the Test and Balance procedures for a zoned system differ from a non-
zoned system.
75-8) How is the CFM at a supply register determined using a velometer?
75-9) What does amp draw have to do with TAB procedures?
75-10) Why are the dampers on registers normally not used for balancing the system
airflow?
75-11) Can a proper balance be performed on a duct system that does not have balancing
dampers for each branch?
75-12) What can cause the total airflow leaving the supply registers to be much lower
than the amount of air the blower is moving?
75-13) Why does a technician working for a TAB firm require specialized training?
75-14) How can TAB improve the health of the occupants?
75-15) Why is interest in TAB picking up in the residential market?
75-16) Can energy costs be affected by TAB of a system?
75-17) How are Feet per minute measurements (FPM) different from cubic feet per
minute measurements (CFM)?
75-18) Name two organizations that support the TAB industry by develop standards and
offering certification.
75-19) How is a single pressure gauge with a rotating dial used to measure the pressure
difference in a circulating water system?
75-20) Why would having a system tested and balanced be a good first step towards
reducing energy cost?