Mechanical HVAC Practice Test with All Correct & 100%
Verified Answers |Actual Complete Exam| Already
Graded A+
A separate and distinct ventilation or exhaust system shall be provided for _____? (A)noxious gases
(B) corrosive fumes (C)flammable vapors (D) incompatible materials. ✔Correct Answer-D. 505.1.2
In systems conveying flammable vapors, gases, or mists, the concentration shall not exceed 25
percent of the lower flammability limit (LFL). Exception: Higher concentrations shall be permitted if
the exhaust system is designed and protected in accordance with the Standard on Explosion
Prevention Systems in Chapter 17, using one or more of the following techniques:
(a) Combustible concentration reduction
(b) Oxidant concentration reduction
(c) Deflagration suppression
(d) Deflagration pressure containment
Separate and distinct systems shall be
provided for incompatible materials.
Liquid adhesive coatings used on listed air filters shall be of a type that will _____? (A)impede air
flow.(B) clog easily. (C)generate noise. (D)have a flash point of 350°F (177°C) or higher. ✔Correct
Answer-D. 503.3 Air filters shall be listed units. Liquid adhesive coatings used on filters shall have a
flash point of 350°F or higher, as determined by the Fire Code standards.
Product conveying ventilation or exhaust systems shall be installed to control, capture, and remove
emissions generated from product use or handling when required by the _____. (A) mechanical
engineer.(B) Building Code or Fire Code. (C) Uniform Mechanical Code. (D) architect. ✔Correct
Answer-B 505.1 General. A mechanical ventilation or exhaust system shall be installed to control,
capture, and remove emissions generated from product use or handling when required by the
Building Code or
Fire Code and when such emissions result in a hazard to life or property. The design of the system
shall be such that the emissions are confined to the area in which they are generated by air currents,
hoods, or enclosures and shall be exhausted by a duct system to a safe location or treated by
removing contaminant's.
Fittings in a Class 2, 3, and 4 product conveying duct system shall be not less than _____ gauge(s)
thicker than the thickness required for straight runs. A. 1 gauge. B. 3 gauge. C. 2 gauge. D. 4 gauge.
✔Correct Answer-C. 506.3 Fittings in Class 2, 3, and 4 systems shall be not less than two gauges
thicker than the thickness required for straight runs. Flexible metallic duct may be used for
connecting ductwork to
vibrating equipment. Duct systems subject to wide temperature fluctuations shall be provided with
expansion joints.
Sprinklers or other fire protection devices shall be installed within ducts having a cross-sectional
dimension in excess of _____ inches when conveying flammable vapors or fumes.
(A) 6" (B) 10"(C) 8" (D) 12" ✔Correct Answer-B. 506.6 Fire Protection. Sprinklers or other fire-
protection devices shall be installed within ducts having a cross-sectional dimension exceeding ten
(10) inches (254 mm) when the duct conveys flammable vapors or fumes. Sprinklers shall be installed
at twelve (12) foot (3,658 mm) intervals in horizontal ducts and at changes in direction. In vertical
runs, sprinklers shall be installed at the top and at alternate floor levels.
, To avoid vibration and stress on the duct, hangers and supports shall be securely fastened to _____.
(A)supports exposed. (B)Type 316 SS.(C) sprinklers on the fire-protection. (D)the building or
structure. ✔Correct Answer-D. 506.5.2 Hangers and supports exposed to corrosive atmospheres
shall be Type 316 SS or equivalent. 506.5.3 To avoid vibration and stress on the duct, hangers and
supports shall be securely fastened to the building or structure.
When a domestic clothes dryer is installed in a closet, a minimum opening of _____ square inches for
makeup air shall be provided.
(A) 4. (B) 24.(C) 6. (D) 100. ✔Correct Answer-D. 504.3.2 Domestic Clothes Dryers. When a
compartment or space for a domestic clothes dryer is provided, a minimum four (4) inch diameter
(102 mm) moisture exhaust duct of approved material shall be installed in accordance with this
section and Section 504.0. When a closet is designed for the installation of a clothes dryer, a
minimum opening of 100 square inches (64,516 mm2) for makeup air shall be provided in the door
or by other approved means.
Air circulation shall be permitted to be provided by leaving all edges of the wall protector open with
at least a(n) _____.
(A) 10 inches from the duct (C) 18 inch air gap (B) 6 inch air gap (D) 1 inch air gap. ✔Correct
Answer-D. 506.7.1.2 With all clearance reduction systems using a ventilated airspace, air circulation
shall be provided as described in Table 5-2. There shall be at least one (1) inch (25 mm) between the
wall protector and combustible walls and ceilings for clearance, reduction systems using a ventilated
space.
With all clearance in reduction systems using a ventilated air space, air circulation shall be provided
as described in Table _____.
(A) 5-3 (C) 6-3 (B) 5-5 (D) 5-2. ✔Correct Answer-D. TABLE 5-2 Reduction of Duct Clearance with
Specified Forms of Protection Clearance reduction applied to and covering all combustible surfaces
with the distance specified as required clearance with no protection in 506.7.2
When ducts are installed in a location where they are subject to physical damage, the ducts shall be
protected by _____.
(A) another duct system (B) painting the duct(C) 2'' by 2'' by 1⁄4'' angle (D) suitable guards.
✔Correct Answer-D- 506.8 Protection from Physical Damage. Ducts installed in locations where
they are subject to physical
damage shall be protected by suitable guards.
A metal-joining method that produces a product without visible interruption or variation in quality is
_____.
(A) a concealed space (B) heat-processing equipment (C) a continuous weld(D) none of the above.
✔Correct Answer-C. CONTINUOUS WELD - A metal-joining method that produces a product without
visible interruption or variation in quality. For the purpose of the definition, it specifically includes
the exhaust compartment of hoods and welded joints of exhaust ducts, yet specifically does not
include filter support frames or appendages inside hoods. [NFPA 96:3.3.14]
Clothes dryers moisture exhaust ducts shall not extend into or _____.
(A) through 1 hour wall separation (B) under the structure(C) in the laundry room(D) through ducts
or plenums. ✔Correct Answer-D. 504.3.1 Moisture Exhaust Ducts. Moisture exhaust ducts shall
terminate on the outside of the building and shall be equipped with a backdraft damper. Screens
shall not be installed at the duct termination. Ducts for exhausting clothes dryers shall not be
connected or installed
Verified Answers |Actual Complete Exam| Already
Graded A+
A separate and distinct ventilation or exhaust system shall be provided for _____? (A)noxious gases
(B) corrosive fumes (C)flammable vapors (D) incompatible materials. ✔Correct Answer-D. 505.1.2
In systems conveying flammable vapors, gases, or mists, the concentration shall not exceed 25
percent of the lower flammability limit (LFL). Exception: Higher concentrations shall be permitted if
the exhaust system is designed and protected in accordance with the Standard on Explosion
Prevention Systems in Chapter 17, using one or more of the following techniques:
(a) Combustible concentration reduction
(b) Oxidant concentration reduction
(c) Deflagration suppression
(d) Deflagration pressure containment
Separate and distinct systems shall be
provided for incompatible materials.
Liquid adhesive coatings used on listed air filters shall be of a type that will _____? (A)impede air
flow.(B) clog easily. (C)generate noise. (D)have a flash point of 350°F (177°C) or higher. ✔Correct
Answer-D. 503.3 Air filters shall be listed units. Liquid adhesive coatings used on filters shall have a
flash point of 350°F or higher, as determined by the Fire Code standards.
Product conveying ventilation or exhaust systems shall be installed to control, capture, and remove
emissions generated from product use or handling when required by the _____. (A) mechanical
engineer.(B) Building Code or Fire Code. (C) Uniform Mechanical Code. (D) architect. ✔Correct
Answer-B 505.1 General. A mechanical ventilation or exhaust system shall be installed to control,
capture, and remove emissions generated from product use or handling when required by the
Building Code or
Fire Code and when such emissions result in a hazard to life or property. The design of the system
shall be such that the emissions are confined to the area in which they are generated by air currents,
hoods, or enclosures and shall be exhausted by a duct system to a safe location or treated by
removing contaminant's.
Fittings in a Class 2, 3, and 4 product conveying duct system shall be not less than _____ gauge(s)
thicker than the thickness required for straight runs. A. 1 gauge. B. 3 gauge. C. 2 gauge. D. 4 gauge.
✔Correct Answer-C. 506.3 Fittings in Class 2, 3, and 4 systems shall be not less than two gauges
thicker than the thickness required for straight runs. Flexible metallic duct may be used for
connecting ductwork to
vibrating equipment. Duct systems subject to wide temperature fluctuations shall be provided with
expansion joints.
Sprinklers or other fire protection devices shall be installed within ducts having a cross-sectional
dimension in excess of _____ inches when conveying flammable vapors or fumes.
(A) 6" (B) 10"(C) 8" (D) 12" ✔Correct Answer-B. 506.6 Fire Protection. Sprinklers or other fire-
protection devices shall be installed within ducts having a cross-sectional dimension exceeding ten
(10) inches (254 mm) when the duct conveys flammable vapors or fumes. Sprinklers shall be installed
at twelve (12) foot (3,658 mm) intervals in horizontal ducts and at changes in direction. In vertical
runs, sprinklers shall be installed at the top and at alternate floor levels.
, To avoid vibration and stress on the duct, hangers and supports shall be securely fastened to _____.
(A)supports exposed. (B)Type 316 SS.(C) sprinklers on the fire-protection. (D)the building or
structure. ✔Correct Answer-D. 506.5.2 Hangers and supports exposed to corrosive atmospheres
shall be Type 316 SS or equivalent. 506.5.3 To avoid vibration and stress on the duct, hangers and
supports shall be securely fastened to the building or structure.
When a domestic clothes dryer is installed in a closet, a minimum opening of _____ square inches for
makeup air shall be provided.
(A) 4. (B) 24.(C) 6. (D) 100. ✔Correct Answer-D. 504.3.2 Domestic Clothes Dryers. When a
compartment or space for a domestic clothes dryer is provided, a minimum four (4) inch diameter
(102 mm) moisture exhaust duct of approved material shall be installed in accordance with this
section and Section 504.0. When a closet is designed for the installation of a clothes dryer, a
minimum opening of 100 square inches (64,516 mm2) for makeup air shall be provided in the door
or by other approved means.
Air circulation shall be permitted to be provided by leaving all edges of the wall protector open with
at least a(n) _____.
(A) 10 inches from the duct (C) 18 inch air gap (B) 6 inch air gap (D) 1 inch air gap. ✔Correct
Answer-D. 506.7.1.2 With all clearance reduction systems using a ventilated airspace, air circulation
shall be provided as described in Table 5-2. There shall be at least one (1) inch (25 mm) between the
wall protector and combustible walls and ceilings for clearance, reduction systems using a ventilated
space.
With all clearance in reduction systems using a ventilated air space, air circulation shall be provided
as described in Table _____.
(A) 5-3 (C) 6-3 (B) 5-5 (D) 5-2. ✔Correct Answer-D. TABLE 5-2 Reduction of Duct Clearance with
Specified Forms of Protection Clearance reduction applied to and covering all combustible surfaces
with the distance specified as required clearance with no protection in 506.7.2
When ducts are installed in a location where they are subject to physical damage, the ducts shall be
protected by _____.
(A) another duct system (B) painting the duct(C) 2'' by 2'' by 1⁄4'' angle (D) suitable guards.
✔Correct Answer-D- 506.8 Protection from Physical Damage. Ducts installed in locations where
they are subject to physical
damage shall be protected by suitable guards.
A metal-joining method that produces a product without visible interruption or variation in quality is
_____.
(A) a concealed space (B) heat-processing equipment (C) a continuous weld(D) none of the above.
✔Correct Answer-C. CONTINUOUS WELD - A metal-joining method that produces a product without
visible interruption or variation in quality. For the purpose of the definition, it specifically includes
the exhaust compartment of hoods and welded joints of exhaust ducts, yet specifically does not
include filter support frames or appendages inside hoods. [NFPA 96:3.3.14]
Clothes dryers moisture exhaust ducts shall not extend into or _____.
(A) through 1 hour wall separation (B) under the structure(C) in the laundry room(D) through ducts
or plenums. ✔Correct Answer-D. 504.3.1 Moisture Exhaust Ducts. Moisture exhaust ducts shall
terminate on the outside of the building and shall be equipped with a backdraft damper. Screens
shall not be installed at the duct termination. Ducts for exhausting clothes dryers shall not be
connected or installed
