Exam (elaborations)
BOMA-HVAC QUESTUIONS WITH CORRECT ANSWERS
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Exam of 6 pages for the course BOMA at BOMA (BOMA-HVAC)
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BOMA-HVACThe man whose work is considered the real beginning of the science of air-conditioning
_____. - answerWillis Carrier
Psychrometry refers to the relationship between _____ and _____. - answerHumidity;
air
The amount of moisture in the air compared to how much it can hold is _____. -
answerRelative humidity
The human bodies well being depends upon the _____. - answerBodies metabolism
The device used to determine the moisture content of air is the _____ -
answerpsychrometer
Of the fuels listed the one that is the most efficient is _____. - answerGas
The effective temperature takes into consideration the effect of _____ and _____. -
answerHumidity; temperature
Air conditioning is the control of the _____, _____, _____ and _____. -
answerTemperature, humidity, purity and distribution of air.
The element that makes up the greatest percentage by volume of air is _____. -
answerNitrogen
Steam gives off a great amount of heat because of its _____. - answerSpecific heat
The velocity of air moving thru a fan system is expressed in _____. - answerFeet per
minute
What volume of air will move thru a duct 24x18 at velocity of 450 feet per minute? -
answer1350 cfm
The following types of fans are classified as centrifugal fans. - answerForward curved,
radial and backward curved
, Select the statement that does not apply to backward inclined fans. - answerHas an
overloading BHP horse power curve.
The quantity of air moving thru a fan system is expressed in _____. - answerCubic feet
per minute
The instrument used to measure air pressure in duct is the _____. - answerMonometer
Air flow thru a duct has the highest _____. - answerVelocity near the center of the duct.
Select the statement which does not apply to the fan laws. - answerStatic pressure in a
duct increases as the velocity decreases.
Variable air volume system feature is _____. - answerVaries the volume of air with
space temperature conditions
Double duct systems are _____. - answer?
The purpose of a primary control is to _____. - answerStart or stop the system
A pressurestat responds to _____. - answerSystem pressure
The oil safety switch is operated by _____. Oil pressure - answer
A low limit control _____. - answer?
A high limit control _____. - answer?
Limit controls _____. - answerAre wired into the circuit in series
A diulating switch is used to _____. - answerChange proportional action to two position
control.
A ratio relay is used to _____. - answerProvide sequence control of more than one
actuator.
A proportional control: - answerWhere a movement from the set point produces a
proportional movement of the actuator
A three way diverting valve: - answerhas two outlets and one common inlet
Heat will continue to flow between two bodies until they have the same amount of
_____. - answerSensible heat
Heat which causes a change of state is _____. - answerLatent heat
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