G2 Exam Prep Questions and Correct Solutions Graded A+

The best tool for adjusting and setting the pressure on an appliance regulator: a. Manometer b. Velometer c. Psychrometer d. An analyzer - Manometer 3/8 NPS black iron pipe shall? a. Not be used for propane b. Not be used in a concealed location c. Not be used for natural gas d. Not be used for indoors - Not be used in a concealed location (6.3.9) A corrugated metal gas connector connected to a range must not exceed? a. 6' b. 5' c. 3' d. 4' - 6' (6.21.3) A manual shut-off valve shall be installed? a. only on natural gas appliances b. in either drop of riser of a residential appliance c. downstream of the union d. at the drip pocket - In either drop of riser of a residential appliance (6.18.2) Black iron pipe 2 1/2 NPS at 150' long shall be pressure tested to? a. The greater of 50psig or 1.5 times the maximum operation pressure for 180 minutes b. 50 psig for 180 minutes c. 1.5 times the maximum operation pressure for 180 minutes d. 50 psig for 60 minutes - 50 psig for 60 minutes (Table 6.3) Buried piping or tubing shall be? a. only copper type L coated, type G coated, type K uncoated b. only copper type K, L or type G c. schedule 50 ASTM A-53 d. only copper type L or G coated - Only copper type L coated, type G coated, type K uncoated (6.2.7) What is pressure drop? a. The difference in the static pressure at the meter, and the working pressure at the appliance regulator b. The difference between the U tube manometer is the end that is open to the atmosphere and the pressurized side when the appliance regulator is working c. The difference between supply pressure and appliance manifold pressure when the appliance calls for heat d. The difference in the working pressure at the gas meter, and the working pressure at the appliance regulator - The difference in the working pressure at the gas meter, and the working pressure at the appliance regulator Fittings used for steel piping may be made from? a. brass or iron b. copper to malleable iron c. steel and plastic d. malleable iron and steel - Malleable iron and steel (6.2.2) Posts protecting piping and tubing entering a building from vehicular damage shall be? a. clearly marked and identified with yellow paint b. Be spaced not more than 48" apart c. Buried not less than 36" below grade d. Made from 6x6 pressure treated wood - Buried not less than 36" below grade (6.16.15) The equivalent length of a 2 1/2 NPS forged tee is? a. 9.25' b. 12.4' c. 15.3' d. 10.3' - 9.25' (Table A 16) What is the maximum horizontal spacing of supports for N.P.S. 1 1/4 inch gas pipe? a. 8' b. 15' c. 6' d. 10' - 10' (3m) (Table 6.2) When gas piping enters a building, it must? a. Enter above grade b. Be taped, painted, and sleeved c. Have a tracer wire d. Enter below grade - Enter above grade (6.15.8) When sizing a branch line, what is the minimum size of job fabricated welding fittings that can be used on a NPS 6 gas supply header? a. 2" NPS b. 3/4" NPS c. 3" NPS d. 1/2" NPS - 3/4" NPS (6.8.8) A dirt pockets shall be installed at the bottom of any piping or tubing, on the final drop serving an appliance other than a(n) a. Unit Heater b. Furnace c. Clothes dryer d. Boiler - Clothes dryer (6.13.1) Direct-vent wall furnace shall use what maximum length of corrugated metal gas connector? a. 6 ft. b. 4 ft. c. 8 ft. d. 2 ft. - 2 ft. (6.21.3(c)) Every gas hose and gas fitting shall have a minimum working pressure of what. a. 275 PSIG minimum or the setting of the hydrostatic relief valves. b. 350 PSIG for piping and tubing operating at a container. c. 350 PSIG d. 250 PSIG when connected to the outlet of a pump or compressor. - 350 PSIG (6.2.9) What are the requirements for back filling underground piping or tubing? a. It shall not have stones larger than 38 mm b. The fill material shall contain no sharp objects. c. A trench must be dug 15 inches deep d. All of the choices - The fill material shall contain no sharp objects (6.15.6) Question 17 What is the approximate purging time for NPS 1 that is 40 feet in length? a. 7 Seconds b. 28 Seconds c. 14 Seconds d. 43 Seconds - 28 seconds (Annex H Table H.1) What is the maximum distance a readily accessible manual shut-off valve may be installed from an appliance? a. 2 ft. and identified b. 10 ft. and identified c. 25 ft. and identified d. 50 ft. and identified - 50 ft. and identified (6.18.2(d)) What is the minimum unthreaded portion of a piping outlet required when installing a gas piping through a floor for a range? a. 2 Inches b. 6 Inches c. 3 Inches d. 12 Inches - 2 inches (6.12.2) When a high pressure test is required on a gas piping system, what type of medium would you use to perform this test. a. High Pressure gas b. Static pressure using gas c. Low pressure gas d. Air or an inert gas - Air or an inert gas Nesting of bushings is permitted True False - False (6.14.2) Underground piping shall be joined or connected by welding, approved mechanical compression, or press-connect fittings. True False - True (6.15.2) A manual shut off valve shall be installed a. within a maximum of 50 ft (17 m) of the individual residential appliance that it serves. b. Identified by a metal tag attached to the valve c. in either the drop or riser of a residential appliance. d. All of the choices - All of the choices (6.18.2) What is the allowable maximum distance piping supports should be spaced on a 4 inch horizontal gas line? a. 25 feet (7.5 m) b. 15 feet (4.5 m) c. 20 feet (6 m) d. 30 feet (9 m) - 15 feet (4.5 m) (Table 6.2) What is the minimum time and pressure required to test a new welded 4" NPS piping system that is 100 feet long with a supply pressure of 5 psig? a. 180 minutes at 50 psig b. 180 minutes at 1.5 times the maximum operating pressure c. 60 minutes at 50 psig (340 kPa) d. 180 minutes at 50 psig or 1.5 times the maximum operating pressure, whichever is greater - 60 minutes at 50 psig (340 kPa) (Table 6.3) What is the required minimum distance a purge line may terminate from either a building or air intake when purging a piping or tubing system to the outdoors? a. 10 feet b. 20 feet c. 15 feet d. 5 feet - 10 feet (6.23.7)