Home
Practice
Exam Simulator
Study Plan
Flash Card
FAQ
Blog
Average ozone concentration in Earth’s atmosphere as a whole is only about ____ parts per million:
Explore more HVAC questions
Visit our
website
for other HVAC topics now!
Related questions
When dry bulb temperature is equal to wet bulb temperature, the evaporation rate will be:
Wet bulb temperature _______ as rate of evaporation of water from the wick increases.
In Psychrometric char, lines of _____ run diagonally downward from left to right across the chart.
As the relative humidity of the air decreases, the temperature of the air _____:
_______temperature measurement is an indication of moisture content of the air
Openings in screens, louvers and grills for exhaust openings shall be _________________________.
Ducts shall be supported with approved hangers at intervals not exceeding _______ feet.
One chlorine or bromine radical liberated has the capability to act as catalyst and breakdown ____number of ozone molecules:
The maximum vent connector length of a 8" diameter connector is _______ feet.
Where unvented infrared heaters are installed, natural or mechanical means shall provide outdoor ventilation air at a rate of not less than ________ of the aggregateinput rating of all such heaters installed in the space.
______ It is expressed in Btu per pound of dry air:
The ______ of air is reached when the air contains all the moisture it can hold
What is the minimum height above the flor an appliance must be installed in a private garage?
NFPA 58-08 has to do with __________.
Exhaust airflow rate for a barber shop shall be __________ cfm/square foot.
Vented wall furnaces shall be located such that any door swing shall not come closer than _______ inches to any air inlet or air outlet measured at right angles to the opening.
______ of heat transfer takes place in waveforms
Quantities of flammable and combustible liquid in excess of ______ gallons shall be stored in an acceptable or approved cabinet.
The minimum fire protection rating for a fire damper installed in less than 3 hour fire resistance rated assemblies is ________ hours.
Which of the following is the heat content causing an increase in dry-bulb temperature:
What is the minimum height of a guard when a unit is mounted close to the edge of a roof?
Welding cylinders shall be moved by ________?
The minimum clearance from appliances mounted below grade shall be at least?
All gas piping installed on top of roofs shall be elevated not less than _______ inches off the roof surface.
The comfort range of relative humidity for dry bulb temperatures is ______ :
UV radiation can cause which of the following more significantly:
The air mixture calculations are performed on which of the following:
The wet-bulb temperature can never be higher than the dry-bulb temperature.
Underground gas piping systems must be buried at a minimum depth of _______ inches below ground.
In Psychrometric chart Y-axis indicates which of the following:
I have a 1025 rpm motor with a 3.5" motor pulley and i need a blower rpm of 400 rpm. What size blower pulley do i need?
A psychrometric chart presents ______ of moist air in a graphical form
Where equipment requiring access and appliances are installed on roofs or elevated structures at a heigth exceeding _______ feet, such access shall be provided by a permanent approved means of access.
What effect would hooking up a 240 volt transformer to a 208 volt supply voltage have on the secondary voltage?
The _____ of air is the reciprocal of the density
Factory built chimneys for medium heat appliances producing flue gases having a temperature above _______ degrees, measured at the entrance to the chimney, shall comply with UL 959.
Sensible heat can be which of the following:
Which of the following is more reactive in lower atmosphere (Troposphere):
Hotter temperature means the air has _____ capacity to hold water suspended
