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HVAC BOMA 501 EXAM WITH COMPLETE SOLUTIONS
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HVAC BOMA 501 EXAM WITH COMPLETE SOLUTIONS
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HVAC BOMA 501 EXAM WITHCOMPLETE SOLUTIONS
50 degrees centigrade is equal to what in Fahrenheit? - ANSWER-122 degrees
Fahrenheit
a British Thermal Unit (BTU) is the amount of heat required to change what? -
ANSWER-one pound of water one degree Fahrenheit
a fluid is defined as.... - ANSWER-anything that flows
A psychrometric chart is a graph representation of... - ANSWER-thermodynamic
properties
a steam humidifier lends itself to practical use in... - ANSWER-the paper industry,
computer rooms, hospitals
a thermometer is a measuring instrument which indicates what type of heat? -
ANSWER-sensible heat
a ton of refrigeration is equal to... - ANSWER-12000 BTU/LB (12000 btu per pound)
air conditioning is the control of what? - ANSWER-temperature, humidity, purity and
distribution of air
air flow thru a duct has its highest velocity near.... - ANSWER-the center of the duct
air velocities of what (in feet/minute) in an occupied area are considered to be the most
satisfactory? - ANSWER-20 to 40 feet per minute (feet/minute)
calculations involving heat loads of people take into consideration heat due to what? -
ANSWER-sensible heat and latent heat
can the performance of a fan at various speeds and air densities be predicted? -
ANSWER-yes! Through fan curves or calculations
conductance is a term used to denote heat flow through what kind of material? -
ANSWER-non-homogeneous
Conductivity is defined as the amount of heat in BTUs flowing through a piece of what
kind of material? (1" thick in one hour per square foot per degree Fahrenheit) -
ANSWER-homogeneous
, dewpoint refers to the temperature in which air reaches its what? - ANSWER-saturation
point
dry-bulb temperature is room temperature taken by what? - ANSWER-an ordinary
thermometer
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.
enthalpy refers to... - ANSWER-heat content of a refrigerant (both latent AND sensible)
Excessive combustion noise is most likely caused by.... - ANSWER-improper burner
adjustment
Friction losses of pressure in ducted systems occur..... - ANSWER-in elbows, along
duct walls, with increase in air speed
generally speaking; to calculate the required CFM for cooling applications, multiply the
total cooling loads by what? - ANSWER-400 CFM per ton
heat flows by means of..... - ANSWER-conduction, convection, radiation
Heat flows in one direction usually from.... - ANSWER-a position of higher temperature
to a position of lower temperature
heat gain of a structure due to air entering the building through cracks around doors and
windows as well as through door openings is called.... - ANSWER-infiltration
heat which causes a change in state is called - ANSWER-latent heat
heat will continue to flow between two bodies until they are the same.... - ANSWER-
temperature
How many BTUs of heat must be removed from 100 pounds (lbs) of water to cool it from
60F to 40F - ANSWER-2000 BTUs
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
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 a case of failure of a burner to start the most likely cause is.... - ANSWER-a blown
fuse
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