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559 Journeyman Mechanical Exam 100% Solved
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559 Journeyman Mechanical Exam 100% Solved
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559 Journeyman Mechanical Exam 100% SolvedWhen making piping bends and change of direction in a metallic gas pipe system, the pipe shall
not be bent thru an arc of more than _____ degrees. Correct Ans-90 degrees - 2015 IFGC
409.5.1
Underground gas piping shall be installed a minimum depth of _____ inches below grade unless
serving an individual outside lights, grill or other appliance, which shall be permitted to be
installed a minimum of ______ inches below grade. Correct Ans-12, 8 - 2015 IFGC 404.12,
404.12.1
In testing a natural gas line to an appliance in a residence, the test pressure to be used shall not
be less than ______ times the maximum working pressure, but not less than _____
psig. Correct Ans-1 ½, 3 - 2015 IFGC 406.4.1
Copper and brass piping shall not be used in a natural gas piping system where the gas contains
______ than an average of _____ grains of hydrogen sulfide per 100 standard cubic feet of
gas. Correct Ans-more, .3 - 2015 IFGC 406.4.1
Copper and brass piping shall comply with Standard Type K or L of ASTM B 88 or ASTM B
280. Correct Ans-True - 2015 IFGC 403.5.2
The volumetric flow rate of gas to be provided shall be the sum of the maximum input of the
appliances served. Correct Ans-True - 2015 IFGC 402.2
The maximum design operating pressure for a natural gas piping system located inside a
building shall not exceed 5 pounds psig. Correct Ans-True - 2015 IFGC 402.6
A horizontal steel gas pipe, one inch in diameter, is required to be supported a maximum of
every _____ feet. Correct Ans-8 - 2015 IFGC 415.1 and table 415.1
, What is the minimum size (nominal inch) supply line (from the outlet side of the meter to the
appliance interconnection point) that would be required for a schedule 40 metallic supplying 2
furnaces, 135,000 BTU/h each located 50 feet from the gas meter? The fuel is natural gas,
supplied with an inlet pressure of less than 2 psi; a pressure drop of .5, a specific gravity of 0.60
and supply rate of 1,000 cfh. Correct Ans-1" (270,000 BTU/h, locate on correct table given gas
criteria) - 2015 IFGC 402.4 and Table 402.4(2)
Oxygen is an approved test medium to pressure test a gas line? Correct Ans-False - 2015 IFGC
406.2
What is the largest BTU input rated appliance that can be installed in a mechanical room that
measures 10' x 10' x 8' Correct Ans-16,000 BTUS (1,000 BTU per 50 cubic feet) - 2015 IFGC
304.51
How many amps can a 40va, 120v transformer with a 24v secondary carry? Correct Ans-1.7A
(40va/24v) - OHM'S LAW
______________ motors driving exhaust fans shall not be placed inside booths and
ducts. Correct Ans-Electric - 2015 IMC 502.7.3.6
A 14-inch gas vent protruding through a roof and located within 8 feet of a vertical wall must
terminate not less than ________ feet above highest point it passes through the roof. Correct
Ans-2 feet - 2015 IFGC 503.6.4
The maximum vent connector length of an 8" diameter connector is _______ feet. Correct
Ans-12 - 2015 IFGC Table 504.3.2
What size steel gas pipe is required to supply a branch line 50 foot long for a 185,000 BTU gas
fired furnace? (assume natural gas is at 1,000 BTUs per cubic foot, .5 in. water column pressure
drop, pressure less than 2 psi and a specific gravity of .60) Correct Ans-A: 1" - 2015 IFGC Table
402.4(2)
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