HVAC contractor exam test 6
Zero on the Rankin scale (0 degrees R) is equivalent to what temperature
Fahrenheit? - --460 degrees F
- Some old, large oil-filled capacitors (found in fluorescent lamp ballasts, and
other applications) can leak and create a safety hazard. This dielectric fluid
contains what type of material? - -PCBs (Polychlorinated biphenyl)
- A building with double pane windows has an outside termperature of 10
degrees F deg whie maintaining an inside temperature of 72 degrees F deg.
Calculate the MAXIMUM winter humidity design: - -30% RH
- What should be called a room where fuel-burning appliances are working
and its volume is NO MORE than 50 cubic feet per 1,000 Btu/h of input
rating? - -Confined space
- Capillary tube capacity is determined by the pressure difference, length of
the tube, and inside diameter of the tube. What size length tube would be
required given the following:
-High-temperature R-22 system
- 1/2 horsepower compressor - -108 inch length and .064 ID
- A worker has finished installing a gas piping system with 1,500 cubic feet
of pipe volume. AT LEAST for how long should he test the system? - -1 1/2
hours
- Dealing with Type 1 hoods and combustible construction: Select the
correct MINIMUM separation between the grease duct system and the
exhaust equipment. - -18 inches
- According to the Texas Air Conditioning and Refrigeration Administrative
Rules, which of the following can be performed by a non licensed person? - -
Install, repair, or remove a vent hood (remove mold from a duct)
- Referring to louvers and grilles and their size of openings for combustion,
ventilation and diluted air: Screens shall have a mesh size NOT SMALLER
THAN _________ inches. - -1/4 inch
- Which instrument is used to measure the pressure drop across an air filter?
- -Manometer
, - The installation of dryer exhaust, of commercial clothes dryers, shall have
ducts with a clearance of AT LEAST ______ inches to combustible materials. -
-6 inches
- The units of thermal conductivity are BTU/SQ.FT./HR. It is the measure of
__________? - -How quickly heat can travel through material
- When a HVAC technician works on a commercial unit, all of the following,
with the exception of which one, are likely causes of excessive noise? - -Low
head pressure
- Using the duct size calculator provided, what would be the approximate
Friction Loss (inches of water per 100 feet of duct) given the following
variables?
-12" x 8" rectangular duct
-1,000 CFM per 100 feet of duct - -.050
- TDLR has two license classifications that depended on what size air
conditioning and refrigeration units will be installed and serviced. What is the
limitation for a Class A contractor's license? - -None, heating and cooling of
any size
- Solve for the MINIMUM total area required in a 120,000 Btu furnace
supplied with combustion air from inside a building. - -120 square inches
- A technician is installing a 125,000 Btu/h fan-assisted gas-fired appliance
in a furnace room with a , Btu/h natural draft hot water heater. This unit has
two horizontal ducts communicating with the outdoors. Solve for the
MINIMUM size combustion air ducts required. - -10' x 10'
- In commercial systems, multiple temperature installations may short cycle
a pressure-controlled condenser. Therefore, to eliminate this problem, which
of the following could be installed in the main suction line just ahead of the
compressor? - -A surge tank
- Pressure relief devices, such as a refrigeration fusible plug, located within
the machinery room shall terminate outside of the structure at a location
NOT LESS THAN ________ feet? - -15 feet
- Which of the following refrigerant devices cannot be adjusted? - -Capillary
tube
- Ducts that operate at temperatures exceeding 120 degrees F shall have
sufficient thermal insulation to limit the exposed surface temperature to
________ degrees F. - -120 degrees F
Zero on the Rankin scale (0 degrees R) is equivalent to what temperature
Fahrenheit? - --460 degrees F
- Some old, large oil-filled capacitors (found in fluorescent lamp ballasts, and
other applications) can leak and create a safety hazard. This dielectric fluid
contains what type of material? - -PCBs (Polychlorinated biphenyl)
- A building with double pane windows has an outside termperature of 10
degrees F deg whie maintaining an inside temperature of 72 degrees F deg.
Calculate the MAXIMUM winter humidity design: - -30% RH
- What should be called a room where fuel-burning appliances are working
and its volume is NO MORE than 50 cubic feet per 1,000 Btu/h of input
rating? - -Confined space
- Capillary tube capacity is determined by the pressure difference, length of
the tube, and inside diameter of the tube. What size length tube would be
required given the following:
-High-temperature R-22 system
- 1/2 horsepower compressor - -108 inch length and .064 ID
- A worker has finished installing a gas piping system with 1,500 cubic feet
of pipe volume. AT LEAST for how long should he test the system? - -1 1/2
hours
- Dealing with Type 1 hoods and combustible construction: Select the
correct MINIMUM separation between the grease duct system and the
exhaust equipment. - -18 inches
- According to the Texas Air Conditioning and Refrigeration Administrative
Rules, which of the following can be performed by a non licensed person? - -
Install, repair, or remove a vent hood (remove mold from a duct)
- Referring to louvers and grilles and their size of openings for combustion,
ventilation and diluted air: Screens shall have a mesh size NOT SMALLER
THAN _________ inches. - -1/4 inch
- Which instrument is used to measure the pressure drop across an air filter?
- -Manometer
, - The installation of dryer exhaust, of commercial clothes dryers, shall have
ducts with a clearance of AT LEAST ______ inches to combustible materials. -
-6 inches
- The units of thermal conductivity are BTU/SQ.FT./HR. It is the measure of
__________? - -How quickly heat can travel through material
- When a HVAC technician works on a commercial unit, all of the following,
with the exception of which one, are likely causes of excessive noise? - -Low
head pressure
- Using the duct size calculator provided, what would be the approximate
Friction Loss (inches of water per 100 feet of duct) given the following
variables?
-12" x 8" rectangular duct
-1,000 CFM per 100 feet of duct - -.050
- TDLR has two license classifications that depended on what size air
conditioning and refrigeration units will be installed and serviced. What is the
limitation for a Class A contractor's license? - -None, heating and cooling of
any size
- Solve for the MINIMUM total area required in a 120,000 Btu furnace
supplied with combustion air from inside a building. - -120 square inches
- A technician is installing a 125,000 Btu/h fan-assisted gas-fired appliance
in a furnace room with a , Btu/h natural draft hot water heater. This unit has
two horizontal ducts communicating with the outdoors. Solve for the
MINIMUM size combustion air ducts required. - -10' x 10'
- In commercial systems, multiple temperature installations may short cycle
a pressure-controlled condenser. Therefore, to eliminate this problem, which
of the following could be installed in the main suction line just ahead of the
compressor? - -A surge tank
- Pressure relief devices, such as a refrigeration fusible plug, located within
the machinery room shall terminate outside of the structure at a location
NOT LESS THAN ________ feet? - -15 feet
- Which of the following refrigerant devices cannot be adjusted? - -Capillary
tube
- Ducts that operate at temperatures exceeding 120 degrees F shall have
sufficient thermal insulation to limit the exposed surface temperature to
________ degrees F. - -120 degrees F
