Hvac Journeyman Exam Questions and Answers

Hvac Journeyman Exam Questions and
Answers15

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. - ANSWERS -C. leaks in a gas piping shall be located with a non corrosive
leak detecting fluid. UMC Section 1316.4.2



Condensate drain piping shall have a slope of not less than _____ inch per foot. A 1⁄8" B.¼" C.½"
D. 1" - ANSWERS -A. Slope of not less than 1/8" per foot. UMC Section 309.1



The minimum gauge or size steel wire used to support horizontal metal ducts 10 inches or less
in size is _____. A.14 AWG B.16 AWG C.18 AWG D.20 AWG - ANSWERS -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 be
installed 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 supply duct. -
ANSWERS -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 without combustion air
openingsis _____ Btu.(A) 80,000 (C) 140,000(B) 100,000 (D) 320,000 - ANSWERS -31 D. 701.2.1



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. - ANSWERS -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 - ANSWERS -C.
appliances shall not UMC Section 802.5.5.1



Any joint obtained by joining of metal parts with alloys that melt at temperatures higher than
840°F, but lowerthan the melting temperature of the parts to be joined, is a _____ joint.(A)
brazed(B) fused (D) soldered (C) welded - ANSWERS -A. Is a brazed joint UMC section 2 1 2.0



Defects on gas piping or fittings shall be _____.(A) repaired(B) replaced or repaired and
retested(C) repaired by a certified welder(D) ignored, as the operating pressure is much less
than the air test. - ANSWERS -B. Fitting shall be replaced or repaired and retested. UMC Section
1316.4.3



Every absorption refrigerating system supported from the ground shall rest on a concrete slab
extending not less than _____ the adjoining ground level.(A) 3 inches below(B) 3 inches above
(C) 6 inches below(D) 6 inches above. - ANSWERS -B. Slab extending not less than 3" above the
adjoining ground level. UMC Section 1106.2



Any part of a venting system installed at an angle greater than 45 degrees from the vertical is
considered by code to be _____.(A) vertica(B) horizontal l (C) a flat vent (D) an offset vent -
ANSWERS -B. any part of the venting installed at an angle GREATER than 45 degrees is
considered by this code to be Horizontal UMC Section 802.6.1.1



Listed transition ducts f or clothes dryers shall not exceed_____ feet in length. A.3 B.4 C.5 D.6. -
ANSWERS -D. Dryers shall not exceed 6 feet in length. UMC Section 504.3.2.1



Industrial product-conveying ducts and their fittings for abrasive and nonabrasive dust or solid
materials shall be constructed of _____.(A) sheet meta(B) polyvinyl chloride l (C) fiberglass (D) A
and C apply - ANSWERS -A. Shall Be Constructed of sheet metal. UMC Section. 5 0 6.1