gas tech 3 tests review questions with correct answers

gas tech 3 tests review questions with correct
answers



steel piping used in gas installations shall comply with? - answer-ASTM A53 OR ASTM
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106
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if a branch piping outlet is installed in the main supply piping before it is known what size
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vof piping is going to be connected to it, what size should the outlet be? - answer-the
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vsame size as the main supply piping.
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if a branch line used to supply a range in the kitchen of a single family home is not
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vrequired any longer, how must the line be terminated? - answer-with a coupling, closed
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vnipple and a plug valve, or a plug cap made of material compatible with the material of
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vthe piping or tubing system.
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the actual pressure drop in a gas line is measured by subtracting the? - answer-working
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vpressure at the appliance from the working pressure at the gas meter.
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unions and swing joints shall NOT be used where piping is to be? - answer-concealed
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copper tubing used for underground service shall be? - answer-type K or type L coated,
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or type G coated
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for residential natural gas piping systems of 200 ft or less, and having a working
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vpressure less than 2 psig, the piping or tubing shall be pressure tested using either air or
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van inert gas for? - answer-15 minutes
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pipe previously used for natural gas : - answer-may be used for propane if cleaned.
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on a recreational vehicle, all branch connections off the main gas supply line shall be
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made: - answer-outside the vehicle.
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pipe fittings in gas piping systems shall be made of? - answer-malleable iron or cast iron.
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if a 1/2 cubic foot test dial makes one complete revolution on 18 seconds , the input is? -
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vanswer-100,000 btuh v

, if the appliance manual shut off valve is in the closed, movement of the 1/2 cubic foot
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vtest dial indicates? - answer-a gas leak in the line downstream from the gas meter
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the diameter of a drip or dirt pocket shall be equal to the diameter of the piping or tubing
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vthat it serves, or - answer-2 inches (50 mm)
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how is the longest length determined for systems operating over 2 psig. - answer-add
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the equivalent length in feet of straight pipe for each fitting, bend or valve to the longest
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pipe run.
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what is the minimum depth a gas line must be buried under a lawn? - answer-15 inches
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the fittings used to protect pipe threads during shipment are not allowed to be used in
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vinstallations because they: - answer-are made with running threads.
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the total resistance of two 10 ohm resistors connected in parallel is? - answer-5 ohms
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when checking to determine the unknown voltage supply with an analogue meter, which
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range would you select? - answer-the highest range.
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a _____ is used to to check for potential . - answer-voltmeter
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the resistance reading you would get when checking an open circuit with an analogue
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vmeter would be - answer-infinity
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on a 120 volt receptacle, the neutral connection terminals are? - answer-silver
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the current required to to operate a device rated for 1500 watts at 120 volts is? - answer-
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12.5 amps v




the voltage reading across an open switch of an energized electrical circuit should be? -
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vanswer-the applied voltage v v




current will be the same through out a series circuit? - answer-TRUE
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the resistance reading across a good fuse would be - answer-0 ohms
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the total current in a parallel circuit will be - answer-the sum of the current passing
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vthrough each branch of the circuit. v v v v v




atoms are said to be electrically neutral when they contain the same number of
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_________ and ________. - answer-electrons and protons
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a step down transformer is a transformer which produces a secondary voltage which is
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_____ than the primary voltage: - answer-lower
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