G2 Exam Prep - a. Manometer b. Velometer c. Psychrometer d. An...

G2 Exam Prep

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• The best tool for adjusting and setting the pressure on an appliance regu- lator:

a.Manometer b.Velometer c.Psychrometer d.

An analyzer: Manometer

• 3/8 NPS black iron pipe shall?
• Not be used for propane
• Not be used in a concealed location
• 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?
• 6'
• 5'
• 3'

d. 4': 6' (6.21.3)

• A manual shut-off valve shall be installed?
• only on natural gas appliances
• in either drop of riser of a residential appliance
• downstream of the union
• 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?
• The greater of 50psig or 1.5 times the maximum operation pressure for 180 minutes
• 50 psig for 180 minutes
• 1.5 times the maximum operation pressure for 180 minutes

d. 50 psig for 60 minutes: 50 psig for 60 minutes (Table 6.3)

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• Buried piping or tubing shall be?
• only copper type L coated, type G coated, type K uncoated
• only copper type K, L or type G
• schedule 50 ASTM A-53
• 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?
• The difference in the static pressure at the meter, and the working pressure at the

appliance regulator

• 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

• The difference between supply pressure and appliance manifold pressure when

the appliance calls for heat

• 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?
• brass or iron
• copper to malleable iron
• 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 dam- age

shall be?

• clearly marked and identified with yellow paint
• Be spaced not more than 48" apart
• Buried not less than 36" below grade
• 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?
• 9.25'
• 12.4'
• 15.3'

d. 10.3': 9.25' (Table A 16)

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• What is the maximum horizontal spacing of supports for N.P.S. 1 1/4 inch gas

pipe?

• 8'
• 15'
• 6'

d. 10': 10' (3m) (Table 6.2)

• When gas piping enters a building, it must?
• Enter above grade
• Be taped, painted, and sleeved
• 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?

• 2" NPS
• 3/4" NPS
• 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)

• Unit Heater
• Furnace
• Clothes dryer

d. Boiler: Clothes dryer (6.13.1)

• Direct-vent wall furnace shall use what maximum length of corrugated metal

gas connector?

• 6 ft.
• 4 ft.
• 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.
• 275 PSIG minimum or the setting of the hydrostatic relief valves.
• 350 PSIG for piping and tubing operating at a container.

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• 350 PSIG
• 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?
• It shall not have stones larger than 38 mm
• The fill material shall contain no sharp objects.
• A trench must be dug 15 inches deep
• 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?

• 7 Seconds
• 28 Seconds
• 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?

• 2 ft. and identified
• 10 ft. and identified
• 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?

• 2 Inches
• 6 Inches
• 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.

• High Pressure gas
• Static pressure using gas
• Low pressure gas

d. Air or an inert gas: Air or an inert gas

• Nesting of bushings is permitted