HVAC BOMA 501 STUDY GUIDE QUESTIONS WITH ALL CORRECT ANSWERS
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Course
HVAC BOMA 501
Institution
HVAC BOMA 501
HVAC BOMA 501 STUDY GUIDE QUESTIONS WITH ALL CORRECT ANSWERS
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 elb...
HVAC BOMA 501 STUDY GUIDE
QUESTIONS WITH ALL CORRECT
ANSWERS
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
if the complaint is 'too much heat' and the electrical wiring is short-cycling the most likely
cause is... - Answer-the thermostat heat anticipator is set too low
In case of an electrical heating system not starting, the most likely cause is... - Answer-a
blown fuse
, A psychrometric chart is a graph representation of... - Answer-thermodynamic
properties
Heat flows in one direction usually from.... - Answer-a position of higher temperature to
a position of lower temperature
the three main ways heat transfer takes place are... - Answer-convection, conduction,
radiation
which of the following material is the best conductor of heat? - Answer-metal
heat will continue to flow between two bodies until they are the same.... - Answer-
temperature
enthalpy refers to... - Answer-heat content of a refrigerant (both latent AND sensible)
Psychometric is the science of dealing with the relationship between... - Answer-
humidity and the atmosphere
which of the following is not one of the four environmental qualities provided by
complete air conditioning systems? - Answer-electrostatic suppression
translated into degrees Fahrenheit which is the value of absolute zero? - Answer-minus
460 degrees Fahrenheit (-460F)
when water vapor is considered in a relationship of air, which of the following
statements is most nearly correct? - Answer-Mixing air on a mechanical basis causes a
humid condition
Specific humidity may be defined as.... - Answer-an actual weight of water mixed with a
pound of dry air
The term wet-bulb depression means... - Answer-the difference between a dry-bulb and
a wet-bulb reading on a sling psychrometer
the active element of a relative humidity meter that's used in a humidistat is... - Answer-
the horse hair
which of the following statements is incorrect? - Answer-Evaporative cooling is a
variable heat process
what volume of air will move through a duct 24"x18" with a velocity of 450FPM? -
Answer-1350CFM (24x18 divided by 144 times 450 is 1350)
The element which makes up the greatest volume of air is... - Answer-nitrogen
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