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A collection of multiple-choice questions and answers related to hvac (heating, ventilation, and air conditioning) systems. It covers various aspects of hvac installation, maintenance, and code compliance, offering valuable insights for those preparing for hvac journeyman exams. The questions are accompanied by corresponding answers and references to relevant sections of the uniform mechanical code (umc), providing a comprehensive learning resource.
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Defects on gas piping or fittings shall be _____.(A) repaired(B) replaced or repaired andretested(C) repaired by a certified welder(D) ignored, as the operating pressure is much less than the air test. - Answer B. Fitting shall be replaced or repaired and retested. UMCSection 1316.4. Every absorption refrigerating system supported from the ground shall rest on a concreteslab extending not less than _____ the adjoining ground level.(A) 3 inches below(B) 3 inches above (C) 6 inches below(D) 6 inches above. - Answer B. Slab extending not lessthan 3" above the adjoining ground level. UMC Section 1106. Any part of a venting system installed at an angle greater than 45 degrees from thevertical is considered by code to be _____.(A) vertica(B) horizontal l (C) a flat vent (D) an offset vent - Answer B. any part of the venting installed at an angle GREATER than 45degrees is considered by this code to be Horizontal UMC Section 802.6.1. Listed transition ducts f or clothes dryers shall not exceed_____ feet in length. A.3 B.4C.5 D.6. - Answer D. Dryers shall not exceed 6 feet in length. UMC Section 504.3.2. Industrial product-conveying ducts and their fittings for abrasive and nonabrasive dust orsolid materials shall be constructed of _____.(A) sheet meta(B) polyvinyl chloride l (C) fiberglass (D) A and C apply - Answer A. Shall Be Constructed of sheet metal. UMCSection. 5 0 6. Industrial product-conveying ducts and their fittings for abrasive and nonabrasive dust orsolid materials shall be constructed of _____.(A) sheet metal ((B) polyvinyl chloride C) fiberglass (D) A and C apply - Answer A 511. Unlisted vented gas fireplaces shall have a clearance at the sides and rear of not lessthan _____ inches. Is the Answer: A. 10" B. 12" C 16" D. 18". - Answer D. clearance of an unlisted vented gas fireplace at the sides and the rear not less than 18". UMC Section908.2(B) Leaks in gas piping shall be located _____.(A) with a sniffer(B) with a presto-lite flame (C)with a noncorrosive leak-detecting fluid (D) by increasing the air pressure during a test until the leaks are heard as a whistle. - Answer C. leaks in a gas piping shall be locatedwith a non corrosive leak detecting fluid. UMC Section 1316.4.
Condensate drain piping shall have a slope of not less than _____ inch per foot. A 1B.¼" C.½" D. 1" - Answer A. Slope of not less than 1/8" per foot. UMC Section 309.1 ⁄ 8"
The minimum gauge or size steel wire used to support horizontal metal ducts 10 inchesor less in size is _____. A.14 AWG B.16 AWG C.18 AWG D.20 AWG - Answer C. 18 Minimum Gauge note: AWG is the abbreviation for "gauge size" Table 6-7(B) When smoke detectors are required as part of an automatic shutoff system, they shall beinstalled in the _____. A. return air duct ahead of any fresh-air inlet(B) main supply air duct served by such equipment(C) fresh-air inlet(D) main return and the main supplyduct. - Answer B. shall be installed in the main supply air duct served by equipment. UMC Section 609.0(5) The largest fuel-burning appliance allowed in a room 100'W x 20'L x 8'H withoutcombustion air openingsis _____ Btu.(A) 80,000 (C) 140,000(B) 100,000 (D) 320,000 - Answer 31 D. 701.2. Return air ducts that serve a dwelling unit shall be permitted to be of _____ construction?A.non-combustible B. combustible C. rated D. none of the above. - Answer B. Shall be permitted to be of combustible type UMC Section 602.2 Ex (1) Solid fuel-burning appliances _____ be connected to a venting system that serves a gas-or oil-burningappliance.(A) shall (B) may (C) shall not(D) with special approval may - Answer C. appliances shall not UMC Section 802.5.5. Any joint obtained by joining of metal parts with alloys that melt at temperatures higherthan 840°F, but lowerthan the melting temperature of the parts to be joined, is a _____ joint.(A) brazed(B) fused (D) soldered (C) welded - Answer A. Is a brazed joint UMCsection 2 1 2.
A vessel or arrangement of piping or tubing in which vaporized refrigerant is liquefied byremoval of heat is a _____.(A) compressor (C) evaporator(B) generator (D) condenser - Answer D. A condenser is the piping which vaporizes the refrigerant liquefied by removalof heat, UMC Section 2 0 5.
... - Answer Exxeption (1) The clearance above the top of a casing or appliance for an unlisted upflow furnace is_____ inches.(A) 12 (C) 8(B) 6 (D) 24 - Answer 30 D 1129.
... - Answer 31 D 701.2. When required clearance from the lowest portion of a floor furnace to the ground cannotbe obtained, the - Answer 32 B 602.2 Ex (1)
ground below and to the sides shall be excavated to form a _____ pit under thefurnace.(A) rectangular (C) 45-degree sloped(B) rounded (D) basin-like. - Answer 33 C 802.5.5. ... - Answer 34 A 212. Floor furnaces shall be protected, where necessary, against _____.(A) severe windconditions (C) damage by mechanical means(B) contact with fire-rated material (D) contact with noncombustible material - Answer 35 D 205. ... - Answer 36 A 225. Sediment traps in fuel-gas lines are not required to _____.A) hydronic boilers (C)residential furnaces(B) gas fireplaces (D) commercial furnaces. - Answer 37 A 911.6(B)
... - Answer 38 B 912. Condensate from air-cooling coils and the overflow from evaporative coolers shall becollected and - Answer 39 C 304.1.2,
discharged to a(an) _____.(A) public way (C) approved plumbing fixture or disposalarea(B) plumbing fixture (D) storm sewer. - Answer 904.10.
... - Answer 40 B Table 3- Front clearance to a furnace or boiler shall be _____.(A) minimum 6 inches tocombustibles(B) minimum 6 inches to a door or an obstruction(C) minimum 9 inches to combustibles(D) sufficient for servicing the burner and the furnace or boiler - Answer 41D 912.
... - Answer 42 A 912. Where a furnace plenum is not supplied with the furnace, the fabrication and installationshall _____.(A) be no smaller than the outlet/inlet plenum collar(B) follow manufacturer's instructions(C) be in a workman-like manner(D) not interfere with electrical wiring. -Answer 43 B 1313.
... - Answer 44 C 309. Wall-type room heaters shall not be attached to walls of combustible material unless_____.(A) approved by Authority Having Jurisdiction(B) opening lined with non-combustible material(C) listed for such installations(D) approved by the fire marshal -Answer 45 D 904.2(E)
... - Answer 46 B 903.5, An unlisted pool heater shall be installed with a minimum clearance of _____ inches onall sides and the rear.(A) 24 (C) 6(B) 18 (D) 12 - Answer 904.7(C)
... - Answer 47 C 924.
All boilers, tanks, and equipment shall be securely anchored to _____.(A) the floor (C) thestructure(B) a frame (D) a base. - Answer 58 D 604.
... - Answer 59 B 502. Gas utilization equipment connected to a piping system shall have an accessible,approved manual shutoff - Answer 60 C 307.
valve or a listed gas convenience outlet installed within _____ of the equipment itserves.(A) 3 feet (C) 6 feet(B) 18 inches (D) 4 feet - Answer 61 D 506.9.
Equipment on roofs of buildings more than 15 feet in height shall have _____, unlessother means - Answer 62 B 604.
acceptable to the Authority Having Jurisdiction is used.(A) a permanent outside ladderfixed to the building for roof access(B) an inside means of access to the roof(C) permanent inside or outside means of access to the roof(D) a portable ladder means ofaccess to the roof - Answer 63 A 510.8.2(B)
... - Answer 64 B 604. The main burner of a gas fired boiler shall have an approved manual shutoff valveinstalled _____. - Answer 65 B 205.
(A) upstream of all control devices(B) downstream of all control devices(C) eitherupstream or downstream of all control devices(D) when no regulating valve is installed - Answer 66 C 504.3. Metal ducts installed in or under a concrete slab shall be _____.(A) insulated (C) encasedin at least 2 inches of sand(B) protected from damage (D) encased in at least 2 inches of concrete - Answer 67 D 503.
prohibited(B) permitted (D) screened - Answer 88 C 405. For canopy-type commercial cooking hoods, the inside edge thereof shall overhang orextend a horizontal - Answer 89 B 405.
distance beyond the edge of the cooking surface not less than _____ inch(es).(A) 1 (C)6(B) 3 (D) 12 - Answer 90 C 1312.1.2(A)
Greases filters shall be installed at an angle of not less than _____ degrees from thehorizontal.(A) 30 (C) 60(B) 45 (D) 90. - Answer 91 C 802.
All clothes dryers installed for multiple-family or public use shall be equipped with_____.(A) approved backflow prevention devices (C) approved lint screens(B) approved safety shutoff devices (D) Type II hood. - Answer 92 C 927.2(A)(2) Automatic shutoff is not required when all occupied rooms served by the air-handlingequipment have direct exit to the exterior and the travel distance does not exceed _____ feet.(A) 100 (C) 75(B) 50 (D) 150. - Answer 93 C 405. Excess refrigerants may be stored _____. (A)in a securely fenced yard with a locked gate(C) as required by the Fire Code(B) in a mechanical room (D) in a machinery room - Answer 94 D Table 6- Electrical equipment shall be approved for the class of use as provided in the _____Code.(A) Uniform Mechanical (C) Building(B) Uniform Plumbing (D) Electrical. - Answer 95 B 405. Appliances located in a confined space with all air taken from the inside of the buildingshall have each - Answer 96 D 803.1.
opening for combustion air sized at 1 square inch per _____ Btu/h.(A) 1,000 (C) 4,000(B)2,000 (D) 5,000 - Answer 97 D 405.
Every evaporative cooler supported on an aboveground platform shall be elevated fromthe ground by at - Answer 98 B 308.
least _____ the adjoining ground level.(A) 3 inches below (C) 6 inches above(B) 3 inchesabove (D) 6 inches below. - Answer 99 C 803.1.
Motorized louvers shall be _____ with the equipment so they are proven in the full openposition to main - Answer 100 B 1125.
burner ignition and during main burner operation.(A) installed (C) listed(B) interlocked (D)shipped - Answer ...
The minimum distance from the ground to any metal duct shall not be less than _____inches.(A) 2 (C) 6(B) 4 (D) 12. - Answer ...
A commercial clothes dryer connected to a moisture exhaust duct shall be installed inaccordance with the - Answer ...
_____ instructions.(A) fire marshal's (C) manufacturer's(B) building official's (D)installer's. - Answer ...
Vent connectors shall be securely supported, and joints fastened with _____.(A) duct tape(C) sheet metal screws(B) solder joints (D) welded joints. - Answer ...
Vent connectors shall be pitched upward from the appliance at least _____ inch perfoot.(A) 1 ⁄ 8 (C) 1 ⁄ 2 (B) 1 ⁄ 4 (D) 1. - Answer ...
Environmental air ducts shall terminate at least _____.(A) 3 feet from the property line (C)3 feet from openings in the building(B) 10 feet from the property line (D) A and C apply. - Answer ...
The minimum gauge steel duct that can be used in a residence where the duct size is lessthan 14 inches - Answer ...
in diameter is _____.(A) 24 (C) 28(B) 26 (D) 30. - Answer ... When installing an evaporative cooler, openings in exterior walls shall be _____.(A) 1 inchlarger than the duct (C) 3 inches larger than the duct(B) flashed in an approved manner (D) the same size as the duct ._____ vent connectors shall not be smaller than the listedappliance categorized vent diameter, flue collar diameter, or draft hood outlet diameter.(A) Single wall (C) Listed(B) Type B (D) Corrugated. - Answer ... Modifications made to the supporting framework of buildings as a results of theinstallation of an evaporative cooler shall be in accordance with the _____ Code.(A) Mechanical (C) Fire(B) ASME (D) Building. - Answer ... A positive means of disconnect is required for electrical connections of more than _____volts.(A) 25 (C) 120 (B) 50 (D) 240. - Answer ...
Vent connectors shall not be upsized more than _____ sizes greater than the listedappliance categorized vent diameter, flue collar diameter, or draft hood outlet diameter.(A) three (C) two(B) four (D) seven - Answer ... Refrigeration systems shall be operated and maintained as required by the _____Code.(A) Building (C) Uniform Mechanical(B) Fire (D) Life Safety. - Answer ...