BOMA HVAC 2025 EXAM QUESTIONS AND ANSWERS
A systematic check of a cooling unit is - Answer-Check the evaporator coil, condensate pan, tubing for signs of oil leaks, and the electrical wiring
When beginning an air balance for summer the volume dampers should be - Answer-In the fully open po...
A systematic check of a cooling unit is - Answer-Check the evaporator coil, condensate
pan, tubing for signs of oil leaks, and the electrical wiring
When beginning an air balance for summer the volume dampers should be - Answer-In
the fully open position
What is the first step in checking the power source - Answer-Check the voltage supply
The primary purpose of water treatment in a open recirculating is to - Answer-Prevent
corrosion, prevent scale formation, eliminate organic growth
Water treatment methods depend upon - Answer-Compositions of the water make up,
water makeup rate and the operating pressures of the system
Which of the following are acceptable methods for joining refrigeration piping - Answer-
Silver soldering, flair connections, slyfloss
Humidity may be removed by lowering the - Answer-Dewpoint
What what is the hardest to filter out of an ac system - Answer-Tobacco smoke
What instrument is used to measure pressure in a duct - Answer-Manometer
An example of an axial flow fan is - Answer-A propeller fan
What type of fan is widely used in the hvac industry - Answer-Centrifugal
What fans are classified as centrifugal fans - Answer-Forward curve backward curve
and air foil
T/F propeller fans move large quantities of air against low resistance or static pressure -
Answer-True
What fans move large quantities of air against low resistance - Answer-Propeller fans
What fans move large volumes of air against high resistance - Answer-Centrifugal fans
,variable volume system features are that - Answer-They vary the volume of air with the
space temperature conditions
T/F variable air volume systems feature a single duct with an individual fan control? -
Answer-False
T/F Vav systems are expensive to operate because the fan output drops off as the load
decreases ? - Answer-False
T/F dual duct systems are used in multi room buildings with variable heat loads -
Answer-True
T/F the temperature mixing device in a double duct system are located near the space
which they serve - Answer-True
T/F Dual duct systems are used in multi room buildings having variable heat loads -
Answer-True
T/F dual duct systems provide hot and cold air mixing at the fan - Answer-False
T/F dual duct system are a constant volume system - Answer-True
T/F multi zone systems mixing devices are located near the space to be served -
Answer-False
Multizone system heating and cooling coil are in - Answer-Parallel with the fan
What contaminants are removed by air conditioning cleaning devices - Answer-Bacteria
and spores, gases and vapors, products of combustion , mists and fogs
What device is used to remove bacteria - Answer-Uv filters
Which air cleaning device is used to remove gas and vapors - Answer-Activated
charcoal
Where is total system air pressure measured - Answer-At the blower inlet and blower
outlet
The greater temperature drop is required the fan speed should be - Answer-Decreased
What instruments are used for static pressure measurements - Answer-U tube
manometer, incline nanometer, micro manometer.
What instrument is used for velocity pressure measurements - Answer-Incline
manometer
, Prerotation vanes are used to control - Answer-capacity
The device that would limit the opening of the prerotation vanes on startup is called -
Answer-The load limiting mechanism
On a two stage chiller the flash has generated in the economizer flows - Answer-To the
second stage impeller
Which test would isolate a precise leak - Answer-Soap n bubbles
Capacity control on a chiller is by use of - Answer-A VFD
T/F non condensables are indicated by a difference of more than 2-3 degrees between
the condenser liquid and the temperature of the discharge pressure - Answer-True
Low suction pressure is caused by - Answer-Dirty or restricted chiller tubes
Centrifugal compressor is what type - Answer-Dynamic
The control that would prevent frequent frequent compressor restart is called - Answer-
Anti recycle timer
What equipment is necessary to add or remove refrigerant from a unit - Answer-A
recovery unit, charging manifold and a flexible tube line
The purge unit in a chiller removes - Answer-Non condensables from the condenser
The condenser in a refrigeration system - Answer-Condenses the vapor from the
compressor
If the temperature remains constant and the volume a gas occupies increases the
pressure will - Answer-Decrease
Measuring velocity pressure in a duct
indicates the - Answer-Speed at which the air is moving
Water boils at 212 degrees at which standard condition - Answer-14.967 psi
What allows a system to operate more efficiently - Answer-Condenser that had
refrigerant leaving with 15 degrees subcooling
One watt of electrical energy is equal to - Answer-3.413
Atmospheric pressure at sea level is - Answer-29.92" hg
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