HVAC BOMA 501 Exam Questions With
Correct Answers
Dual Duct System - answerA system in which hot air and cold air are supplied by separate ducts and
mixed at each controlled space to provide the desired supply air temperature. This method consumes a
great deal of energy.
Muiltizone System - an...
Dual Duct System - answer✔A system in which hot air and cold air are supplied by separate ducts and
mixed at each controlled space to provide the desired supply air temperature. This method consumes a
great deal of energy.
Muiltizone System - answer✔an a/c system in which the zone control is obtained by mixing hot and cold
air at the unit in response to a room thermostat
Load Calulations - answer✔take the sensible heat and the latent heat into consideration
which of the following does not provide sensible heat gain? - answer✔Heat from cooking or hot baths
(latent heat has to do with moisture)
Which of the following is the way that solar radiation disperses in a building? - answer✔Transmitted
directly to the interior of the building, absorbs by glass, reflected into the building
outside air may get into the air conditioning spaces by... - answer✔infiltration through the walls,
infiltration through the swinging doors, air induced by replaced exhaust
In commercial buildings heat generated by lights does not seriously affect the control of the heating
system - answer✔false
the human body's feeling of well being depends upon.... - answer✔The body's metabolism
which of the following natural laws has the greatest bearing on the science of air conditioning? -
answer✔Boyles' Law, Charles' Law, Dalton's Law
Why is a pitch pocket commonly used? - answer✔To protect the piping and seal the roof from
refrigeration lines passing through it
Which of the following is an evaporative type condenser and what governs its cooling? - answer✔a
cooling tower governed by web bulb temperature
on an evaporative condenser what is the purpose of the eliminator - answer✔to separate the moisture
carry over
specific heat of a substance - answer✔the amount of heat necessary to raise the temperature of one
pound of a substance one degree Fahrenheit
Latent Heat - answer✔the amount of heat necessary to change a liquid to a vapor with no change in
temperature
The difference between a pump, a fan and a compressor is.... - answer✔pumps pump liquid, fans and
compressors pump air
Which of the following checks should be made of a blower-drive? - answer✔Check the blower belts for
cracks and wear, check the motor bearings for wear, check the blower bearings for wear
Which of the following is a good rule to follow when checking air filters? - answer✔air filters should be
of the size and type recommended by the equipment manufacturer
When one of the three phases of a motor fails, how will the motor react? - answer✔A winding will run
hotter, the motor will (generally) not start, the two phases will draw 1.5 (1 1/2) times more current
When megohming a motor winding what is the rule of thumb to find an acceptable range of resistance
to ground? - answer✔1000 ohms/volt
Which of the following may be the cause of improper air distribution? - answer✔High pressure drop
thru ducts and fittings, dirty filters, incorrect fan speeds
Friction losses of pressure in ducted systems occur..... - answer✔in elbows, along duct walls, with
increase in air speed
Which of the following may cause faulty fan operation? - answer✔Loose belt drive, restricted air intake,
improper fan bearing lubrication
What is the first step taken in all troubleshooting processes? - answer✔Analyze the complaint
If the complaint is 'too little heat' and the burner is short-cycling the most likely cause is.... - answer✔the
thermostat is out of adjustment
Excessive combustion noise is most likely caused by.... - answer✔improper burner adjustment
When a complaint is "too much heat" and the burner is continuously running the most likely cause is.... -
answer✔faulty wiring
In a case of failure of a burner to start the most likely cause is.... - answer✔a blown fuse
what is the most probable cause of a burner to not start? - answer✔power failure
when the complaint is 'too much heat' and the heat element operates continuously the most likely
cause is.... - answer✔faulty control wiring
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