G2 Exam Prep Questions And Already
Solved Solutions.
The best tool for adjusting and setting the pressure on an appliance regulator:
a.
Manometer
b.
Velometer
c.
Psychrometer
d.
An analyzer - Answer 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 - Answer 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' - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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' - Answer 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' - Answer 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 - Answer 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 - Answer 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 - Answer Clothes dryer (6.13.1)
Solved Solutions.
The best tool for adjusting and setting the pressure on an appliance regulator:
a.
Manometer
b.
Velometer
c.
Psychrometer
d.
An analyzer - Answer 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 - Answer 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' - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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' - Answer 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' - Answer 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 - Answer 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 - Answer 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 - Answer Clothes dryer (6.13.1)
