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BOMI: Air Handling, Water Treatment & Plumbing Systems
Exam 2025/2026 | All Chapters Covered| Study Guide Exam with 430 Accurate Questions and Detailed Verified Answers (100% Correct Answers) Already Graded A+
What is a problem with using fibrous glass wool as duct-work material? - ANSWER - The World Health Organization has declared fibrous glass wool as carcinogenic to humans. Cannot use it in hospitals or kitchens.This type of material is used in low-pressure and low velocity duct systems.They have high friction.
Which type of duct uses fiberglass insulation? - ANSWER - Flexible duct.
How can duct leakage be eliminated? - ANSWER - Can be eliminated through use of sealants applied to all duct joints - duct collar tap-ins, branch intersections, access doors, and air terminal connections.
Generally, how long can a duct be before it needs to be insulated? - ANSWER - You should insulate of the duct is more than 50 feet long.
What determines the amount of ventilating air required in a building? - ANSWER - The amount of ventilating air required depends generally on the number of people occupying a space, their activities, the volume of space, and the duration of the stay of the occupants in the space.
Which is the simplest, but least accurate pH test? - ANSWER - pH paper
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pg. 2 A conductivity meter, used to measure TDS, is designed to measure the
ability of water to conduct: - ANSWER - An electrical current
Which is the most accurate testing method for determining water hardness in the field? - ANSWER - Total hardness drop test
In closed-loop heating and cooling systems, __Blank__ protect metal from corrosion by establishing a protective film on anodic surfaces. - ANSWER - Sodium Nitrates
Which type of water pre-treatment involves a cylindrical vessel in which water flows downward through porous layers of sand, anthracite, or calcite?
- ANSWER - Pressure filter
Which type of water pre-treatment involves water flowing through replaceable, finely woven filter material? - ANSWER - Cartridge filter
When collecting water samples, it is important to do all of the following
except: - ANSWER - Keep the water cool
What type of test determines when blow-down is required in a boiler? - ANSWER - Chloride test
What must be tested in order to ensure there is not scale formation? - ANSWER - Sodium phosphates
According to ASHRAE Standard 62-1989, how many cubic feet per minute of air exchange should maintain an acceptable IAQ level? - ANSWER - The air exchange rate should be 15 cubic feet per minute (cfm) to maintain acceptable indoor air quality in a reception area 2 / 4
pg. 3 Office space and conference rooms, the standard is 20 cfm
What are the key elements of proper room ventilation? - ANSWER - The object is to properly combine temperature, humidity, and air motion in the occupied zone of the room, from the floor to 6 feet above the floor.Conditioned space must be distributed so that horizontal and vertical temperature variations within the space are minimized.When fresh air is introduced into the room, the air should be evenly spread out and the air should not strike occupants directly.
When is air movement considered a draft? - ANSWER - A draft is an objectionable air movement in an occupied space.Air velocity below approximately 25 fpm in a room is considered still.Air velocity over 50 fpm is generally considered to be a draft.Air should be distributed between 25-50 fpm.
What is short cycling? - ANSWER - Locating supply air devices and return air devices in close proximity to each other will cause short cycling.This results when the conditioned air flows directly from the supply device to the return deice without the conditioned air getting mixed within the room air.
Describe air distributing ceilings - ANSWER - Air distributing ceilings are use of the confined space above the ceiling as a supply air plenum.This supply air plenum receives the conditioned air directly from the air handling unit with a minimal supply air duct system consisting of a short main duct and no branch ducts.
What are dampers? - ANSWER - Airflow in the duct system is controlled by volume dampers. 3 / 4
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What are some characteristics of volume or balancing dampers? - ANSWER - The dampers provide a resistance to airflow to adjust how much air flows to various areas. Dampers are installed in each branch duct to balance the quantity of airflow in the duct system.Volume dampers are also called balancing dampers.
Why are fire dampers important? - ANSWER - Fire dampers must be installed between walls in the ducts to maintain separation of one tenant’s pace from another.Fire damper prevents the spread of fire and smoke from one area to another through a duct system.
What is a silencer? - ANSWER - A silencer is a specially designed duct component that changes airflow characteristics so as to reduce the noise made in the duct.
For a centrifugal fan, which type of fan blade affords a wider range of efficiencies and lower noise levels? - ANSWER - Airfoil
The amount of work a fan performs to move a specific volume of air at a specific speed is called what? - ANSWER - AHP - Air Horse Power
The amount of physical work that was input to a fan's motor to drive the fan shaft is called what? - ANSWER - BHP - Breaking Horse Power
The air pressure a fan exerts in all directions against the inside walls of a closed system is called? - ANSWER - Static pressure
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