NGA 70 & 71 PROMETRICS EXAM STUDY
GUIDE 2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. Shoring is mandatory for all excavations at what depth - ANSWER ✔ 5 feet
or more
2. Electrical lines - ANSWER ✔ Red
3. Gas/fuel lines - ANSWER ✔ Yellow
4. Communications - ANSWER ✔ Orange
5. Potable/drinking water - ANSWER ✔ Blue
6. Reclaimed irrigation water - ANSWER ✔ Purple
7. Sewer - ANSWER ✔ Green
,8. Survey - ANSWER ✔ Pink
9. Proposed excavation - ANSWER ✔ White
10.Continue backfilling and compaction with a hand or mechanical tamper at
how many inches - ANSWER ✔ 6-12 inches
11.Who do you call before any excavation - ANSWER ✔ 811
12.How often do you check proper compaction - ANSWER ✔ Every 25 feet
13.What do you do when a gas is being undermined - ANSWER ✔ Make sure
you have support
14.How far should soil be from the trench - ANSWER ✔ 2 feet
15.Aldehydes - ANSWER ✔ Toxic substance formed from incomplete
combustion
16.Carbon Monoxide - ANSWER ✔ CO, byproduct of incomplete combustion
17.Products of incomplete combustion - ANSWER ✔ CO, Aldehydes, Heat
18.Products of complete combustion - ANSWER ✔ CO2, H2O, heat
,19.Excess Flow Valve - ANSWER ✔ shuts off flow when a predetermined
value is exceeded.
20.Hydrocarbon - ANSWER ✔ Combination of hydrogen and carbon found in
natural gas, oil and coal.
21.Natural Gas Ignition Temperature - ANSWER ✔ 1100-1200 F
22.Mercaptan - ANSWER ✔ a sulfur like odor that is added to natural gas
before distribution to the consumer, to give it a distinct, unpleasant odor
23.Flammability range of natural gas - ANSWER ✔ 5-15%
24.Specific gravity of natural gas - ANSWER ✔ 0.6
25.Specific gravity of air - ANSWER ✔ 1.0
26.specific gravity of propane - ANSWER ✔ 1.56
27.Components of natural gas - ANSWER ✔ Methane, Ethane, Inert gases,
propane/heavy hydrocarbons.
28.Ethane - ANSWER ✔ Distinguishing feature of pipeline nautural gas
29.Gas temp will drop X F for every XXX psig reduction - ANSWER ✔ 7
degrees for 100 psig
, 30.Temperature at which natural gas can form a "frost ball" - ANSWER ✔ 32 F
31.Elements of combustion - ANSWER ✔ Fuel, oxygen, ignition
32.Dig-In - ANSWER ✔ Third party damage. #1 avoidable cause of pipeline
damage.
33.Causes of emergency situation - ANSWER ✔ third party damage,
overpressure, accumulation in lines, component failure, vandalism,
excavation
34.Low pressure leaks may move - ANSWER ✔ slowly, and spread over a
wider area
35.High pressure leaks may move - ANSWER ✔ more directly through the path
of least resistance
36.Moist soil effect on underground leak - ANSWER ✔ creates a barrier to
traveling upwards, accumulating underground may cause horizontal
migration
37.Dry soil effect on underground leak - ANSWER ✔ gas moves freely, may
absorb odorants
38.Frozen soil effect on underground leak - ANSWER ✔ creates a barrier, may
cause horizontal migration
GUIDE 2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. Shoring is mandatory for all excavations at what depth - ANSWER ✔ 5 feet
or more
2. Electrical lines - ANSWER ✔ Red
3. Gas/fuel lines - ANSWER ✔ Yellow
4. Communications - ANSWER ✔ Orange
5. Potable/drinking water - ANSWER ✔ Blue
6. Reclaimed irrigation water - ANSWER ✔ Purple
7. Sewer - ANSWER ✔ Green
,8. Survey - ANSWER ✔ Pink
9. Proposed excavation - ANSWER ✔ White
10.Continue backfilling and compaction with a hand or mechanical tamper at
how many inches - ANSWER ✔ 6-12 inches
11.Who do you call before any excavation - ANSWER ✔ 811
12.How often do you check proper compaction - ANSWER ✔ Every 25 feet
13.What do you do when a gas is being undermined - ANSWER ✔ Make sure
you have support
14.How far should soil be from the trench - ANSWER ✔ 2 feet
15.Aldehydes - ANSWER ✔ Toxic substance formed from incomplete
combustion
16.Carbon Monoxide - ANSWER ✔ CO, byproduct of incomplete combustion
17.Products of incomplete combustion - ANSWER ✔ CO, Aldehydes, Heat
18.Products of complete combustion - ANSWER ✔ CO2, H2O, heat
,19.Excess Flow Valve - ANSWER ✔ shuts off flow when a predetermined
value is exceeded.
20.Hydrocarbon - ANSWER ✔ Combination of hydrogen and carbon found in
natural gas, oil and coal.
21.Natural Gas Ignition Temperature - ANSWER ✔ 1100-1200 F
22.Mercaptan - ANSWER ✔ a sulfur like odor that is added to natural gas
before distribution to the consumer, to give it a distinct, unpleasant odor
23.Flammability range of natural gas - ANSWER ✔ 5-15%
24.Specific gravity of natural gas - ANSWER ✔ 0.6
25.Specific gravity of air - ANSWER ✔ 1.0
26.specific gravity of propane - ANSWER ✔ 1.56
27.Components of natural gas - ANSWER ✔ Methane, Ethane, Inert gases,
propane/heavy hydrocarbons.
28.Ethane - ANSWER ✔ Distinguishing feature of pipeline nautural gas
29.Gas temp will drop X F for every XXX psig reduction - ANSWER ✔ 7
degrees for 100 psig
, 30.Temperature at which natural gas can form a "frost ball" - ANSWER ✔ 32 F
31.Elements of combustion - ANSWER ✔ Fuel, oxygen, ignition
32.Dig-In - ANSWER ✔ Third party damage. #1 avoidable cause of pipeline
damage.
33.Causes of emergency situation - ANSWER ✔ third party damage,
overpressure, accumulation in lines, component failure, vandalism,
excavation
34.Low pressure leaks may move - ANSWER ✔ slowly, and spread over a
wider area
35.High pressure leaks may move - ANSWER ✔ more directly through the path
of least resistance
36.Moist soil effect on underground leak - ANSWER ✔ creates a barrier to
traveling upwards, accumulating underground may cause horizontal
migration
37.Dry soil effect on underground leak - ANSWER ✔ gas moves freely, may
absorb odorants
38.Frozen soil effect on underground leak - ANSWER ✔ creates a barrier, may
cause horizontal migration
