Download NC Heating H3 Class 1 Final Exam: Certification Questions and Answers and more Exams Engineering in PDF only on Docsity!
Certification with Questions and Answers.
a safe place of disposal - <<< Answer ✔️ steam blow off valves shall
discharge to ________
NC Fuel Gas Code - <<< Answer ✔️ factory built barbecue appliances
shall be of an approved type and installed in accordance with the nc ________code
100 - <<< Answer ✔️ for the purpose of regulating refrigeration systems,
large mercantile occupancies are defined as those facilities where more than _____ persons congregate to purchase personal merchandise.
18" - <<< Answer ✔️ in order to provide for working clearances,
passageways around all sides of boilers shall have a minimum unobstructed width of _____ inches unless otherwise approved.
attached to the boiler - <<< Answer ✔️ boiler operating instructinos of a
permanents type shall be
variable air volume system - <<< Answer ✔️ a refrigeration system that
incorporates a common condensing unit, a variable capacity compressor and multiple indoor fan coils with independent refrigerant piping is refered to in the code as a
Certification with Questions and Answers.
3" WG - <<< Answer ✔️ under the 2018 NC energy code, duct systems
operating at static pressures in excess of ______ inches w.g. must be leak rested in accordance with the SMACNA HVAC Air Duct Leakage Test Manual.
2" - <<< Answer ✔️ annealed temper copper tube used in refrigerant
piping applications is limited to a maximum size of ____ inches in diameter.
40% - <<< Answer ✔️ studs used in non-bearing partitions are permitted
to be cut or notched to a maximum depth of _____ percent of the stud depth.
10 feet - <<< Answer ✔️ where located above the contaminant source,
gravity outdoor air intake openings provided for ventilation shall be located a minimum of _______ feet horizontally from any noxious contaminant source.
No - <<< Answer ✔️ does an existing, uninsulated sheet metal duct
system require the installation of insulation when an AC coil and outdoor unit is installed when the duct is in a ventilated crawlspace?
450 fpm - <<< Answer ✔️ what is the maximum allowable velocity of air
through a return grill
nitrogen and carbon dioxide - <<< Answer ✔️ required field test of
refrigerant containing parts may be performed with ______ or ______
Certification with Questions and Answers.
radiant - <<< Answer ✔️ when heat is provided outside the building
envelope in a commercial building it shall be _________?
makeup air - <<< Answer ✔️ where mechanical exhaust interferes with
the operation of gas fired appliance ____________ is required.
50 - <<< Answer ✔️ where the air infiltration rate is unknown a room or
space providing indoor combustion air requires a minimum volume of _________ cubic feet per 1000 btu/hr of the appliance input rating.
2 inches - <<< Answer ✔️ holes bored in solid wood joists shall be
located not less than ________ inches from the top and bottom of the joist.
1/4 - <<< Answer ✔️ where a screen is installed at a combustion air
opening the mesh size shall not be smaller than _________ inch.
all of the above - <<< Answer ✔️ electrical requirements for appliances
located in attics and crawlspaces are?
3 feet - <<< Answer ✔️ the maximum horizontal spacing of supports for
3/4 " CPVC tubing shall not exceed _______ feet.
Certification with Questions and Answers.
24 inches - <<< Answer ✔️ appliances installed in a basement of a
dwelling unit shall be accessed by an opening or door and an unobstructed passageway measuring a minimum of ________ inches in width.
16 feet - <<< Answer ✔️ regardless of whether the access is interior or
exterior a permanently installed means of access is required where an appliance is installed on a roof that is located more than ______ feet above grade.
2 inches - <<< Answer ✔️ unless provided with an approved protective
coating metallic underground ducts shall be completely encased in a minimum of ________ inches of concrete
flexible - <<< Answer ✔️ _________ air connectors shall not pass
through any wall, floor or ceiling.
10 - <<< Answer ✔️ return air openings must be located a minimum of
______ feet from the draft hood of another appliance located in the same room.
indirectly - <<< Answer ✔️ drains, overfows and blowdown provisions
for cooling towers shall be _____ connected to an approved disposal system.
Certification with Questions and Answers.
.625 - <<< Answer ✔️ bored holes shall not be closer than _______to
the edge of the stud? must have a float switch to off cycle the equipment in the event of a pump failure, can be used with or without gravity drainage possibilities, can be used only if the pump is installed in an emergency drain pan protected with a float switch that will off-cycle the equipment in the event of a pump failure if
installed above finished building surfaces. - <<< Answer ✔️ which of the
following describe the code restrictions on condensate pump usage?
.50 cfm per ft/square - <<< Answer ✔️ the exhaust rate for a sports
locker room in educational occupancies is _______?
16 feet above grade - <<< Answer ✔️ rooftop installations will require
the installation of a permanent fixed means of access in the form of a ladder or roof hatch when the access height exceeds?
R- 8 - <<< Answer ✔️ supply air duct work run through a ventilated crawl
space in residences in climate zone 4 requires what r-value insulation?
7500 cfh - <<< Answer ✔️ what is the ventilation rate for people only in
cubic feet per hour for a 5000 square foot general office building when using the 2018 NCMC?
Certification with Questions and Answers.
2981 btu/hr - <<< Answer ✔️ what is the heat gain in btu/hr for a dark
colored commercial roof sitting on structural framing with a suspended ceiling below dead airspace if the roof deck is made of 1.5" wood with R-20 insulation board and r-13 on the suspended ceiling. the roof is 65'x65' in wilmington, nc on a summer design day with an indoor temperature of 75 degrees F.
subcooled - <<< Answer ✔️ refrigerant at a temperature below its
saturated temperature is said to be?
1000 fpm - <<< Answer ✔️ a 20" round galvanized duct 100' long,
delivering 2000 cfm of air will be operating at a velocity of ________feet per minute
2" OD - <<< Answer ✔️ copper tubing used for refrigerant piping in
field-erected systems shall be made of copper tubing either hard or annealed. What is the largest size of annealed tubing allowed by the code?
ASHRAE Handbook of Fundamental - <<< Answer ✔️ per the 2018 ncmc,
which of the following is an approved procedure for commercial duct design?
7/8" - <<< Answer ✔️ the largest size annealed copper tubing allowed
to be connected with mechanical fittings is?
Certification with Questions and Answers.
90 db / 74 wb - <<< Answer ✔️ according to ACCA manual N5 what is
the summer design conditions in greensboro, nc?
any contractor with a contract with the project owner - <<< Answer
✔️ in north carolina a "prime contractor" is?
.08 - <<< Answer ✔️ the friction rate per 100' of 10"x8" duct feeding a
390 cfm diffuser must be? assume the duct is unlined galvanized sheet metal.
1050 fpm - <<< Answer ✔️ what is the velocity in a 25" x 8" duct sectino
when 1450 cfm flow down the duct if the duct is wrapped?
666 fpm - <<< Answer ✔️ what is the velocity of air traveling through a
24"x24" filter grill when 75% of the grill is free area and the volume of air is 2000 cfm?
two - <<< Answer ✔️ a confined space shall be provided with
_____________ permanent openings when gas fired appliances are installed and indoor combustion air is used?
no - <<< Answer ✔️ is ti illegal in the state of north carolina to charge
worker compensation insurance premiums to the covered employee?
Certification with Questions and Answers.
$100,000 - <<< Answer ✔️ according to the miller act a payment and
performance bond is required for any federal project above __________ dollars in value.
25 - <<< Answer ✔️ duct liners shall not support the spread of flames
and must have a flame spread index of not more than?
group A2, A3, B2, or B3 - <<< Answer ✔️ carbon steel pipe of schedule
40 shall be used for group A1 and B1 refrigerants for lines 6" and smaler. what refrigerant groups can use this pipe material for liquid lines between 2" and 6" and all suction and discharge lines 6" and smaller?
6" - <<< Answer ✔️ in general, floor furnaces shall have a minimum
clearance from grade of not less than _____ inches.
ready access - <<< Answer ✔️ cooling towers and fluid coolers shall be
provided with _______.
a copy of the cost of labor and materials - <<< Answer ✔️ liens must be
filed within a 120 days of furnishing labor or materials at a project. which of the following is not a requirement for filing a lien?
Certification with Questions and Answers.
1/2" - <<< Answer ✔️ a structure contains a 135,000 btu/hr input
furnaces and a 65,000 btu/hr input water heater in the same area. the appliances are 65 feet from the gas meter and are the only appliances in the structure. assume you have gas supplied to the structure witha specific density of 0.6 and the delivery pressure from the meter is 2 psi. what size type K semi- rigid copper gas line would be required if the total equivalent feet of piping is 65' and the design pressure drop was 1.0 psi?
FR=ASP x 100/ TEL - <<< Answer ✔️ what is the equation to calculate
the design friction rate for a residential duct system according to ACCA manual D?
100 degrees C - <<< Answer ✔️ the boiling temperature of water is
____C degrees?
6300 btu/hr - <<< Answer ✔️ what is the heat gain for the lights in a
room when twenty fluorescent fixtures with standard ballasts and 2-48" t- 12 fluorescent bulbs
clerk of the superior court in the county the property is located. - <<<
Answer ✔️ a contractor, material supplier or subcontractor must file a
notice and a claim of lien with __________?
Certification with Questions and Answers.
outdoor coil - <<< Answer ✔️ an/a _______ is the component in a heat
pump that changes liquid refrigerant into vapor when heat is absorbed into the system in the heating cycle.
78% - <<< Answer ✔️ what is the minimum AFUE rating required for a
gas-fired forced air warm air furnace 120,000 btu/hr when applied in a commercial building?
1.5" - <<< Answer ✔️ a 1.25" diameter chilled water must be insulated
with pipe insulation that is at least _____thick?
3/8" OD - <<< Answer ✔️ what is the minimum size copper tubing fuel-
oil supply line?
48 cfm - <<< Answer ✔️ what is the summer infiltration air quantity of
an 1800sqft residential structure with 8 foot high ceilings of average construction in greensboro, nc?
yes - <<< Answer ✔️ is an outdoor air economizer required for a
120,000 btu/hr rooftop heat pump required if the job is in guildford county, north carolina
Certification with Questions and Answers.
200 pound - <<< Answer ✔️ floor registers shall resist without structural
failure a ______ pound concentrated load on a 2 inch diameter disc applied to the most critical area of the exposed face.
the boiler installer - <<< Answer ✔️ boilers shall have a ll controls set,
adjusted and tested by _________?
minimum operating pressure - <<< Answer ✔️ when sizing a closed-type
expansion tank, which of the following criteria is not required?
4 feet - <<< Answer ✔️ where PB piping is installed vertically in a
hydronic piping system, it shall be supported at maximum intervals of ___________.
6.6lbs - <<< Answer ✔️ all refrigeration systems containing more than
______ refrigerant of refrigerant in systems using positive displacement compressors shall have stop valves installed.
