NGA 85: Meter Assembly and Abnormal Operating Conditions (AOCs) Practice Test

These questions are part of the practice quiz. Start practicing

• A gas with a specific gravity of 0.6 relative to air is lighter than air.
• What protection do filters/strainers provide in meter assemblies?
• Which method is described for detecting leaks around joints and flanges on a meter assembly?
• Which additive is used to make natural gas detectable by smell?
• Under Definition 4.5, which option is the Specific Gravity Propane?
• What is the recommended procedure to shut in a meter during an AOC?
• Which statement about meter orientation is correct?
• What pressure is most likely to cause an explosion or unintentional ignition?
• What can cause over-pressurization in a pipeline?
• Which statement correctly describes the measurement principle of diaphragm meters vs turbine meters?
• What does LEL stand for?
• What is the specific gravity of carbon monoxide?
• How should a gas meter be oriented in the piping system?
• Which events constitute an emergency requiring rapid response?
• Gas moves from high pressure to low pressure.
• Which statement is true about natural gas and oxygen in a confined space?
• Which is most often responsible for pipeline damage?
• What is a precaution toward underground pipeline damage?
• Which safety consideration is essential during meter installation?
• The specific gravity of propane is 3.5.
• What is the consequence of not having a properly functioning regulator and relief device in a meter system?
• What is regulator icing, and why is it problematic?
• Natural gas is explosive at what percentage?
• Why is over-pressurization dangerous in a meter system?
• What can mask or weaken the gas odor?
• An indication of over pressurization is most accurately shown by which condition?
• What is the odorant that is added to natural gas called?
• Carbon monoxide: which statement is true?
• What is the purpose of the upstream shutoff valve in a gas meter assembly?
• The largest component of natural gas is methane.
• Carbon Monoxide poisoning can impair your judgment or ability to reason.
• Which option states that complete combustion results in?
• Which of the following is NOT a basic component of the fire triangle?
• Describe a standard external leak testing method for a meter assembly.
• How does a regulator in a gas meter assembly function?
• What should be checked after a repair before restoring service?
• Which statement describes the relationship between temperature and volume for natural gas?
• What PPE should be worn?
• Which statement best describes an abnormal operating condition (AOC) scenario?
• What is the specific gravity of Natural Gas?
• What is the recommended tool/method to detect leaks around joints and flanges?
• Which option corresponds to the ignition temperature of Propane?
• What color is the flame when there is good combustion?
• Most damage done to a pipeline is a result in:
• What is the first valve to close in an isolation sequence?
• Why is bonding/grounding important in meter installations?
• When cooled, natural gas will become a liquid.
• Natural gas can cause asphyxiation in enclosed spaces.
• Which term describes the minimum concentration of vapor in air capable of ignition?
• What is the purpose of bonding clamps in outdoor meters?
• How often should leak checks be performed according to typical practice?
• Within which concentration range is natural gas considered explosive?
• What is the purpose of bonding/grounding provisions in a meter assembly?
• What percentage range of natural gas is methane according to the material?
• How do you verify that an AOC has been resolved?
• What does UEL stand for?
• What term describes gas movement along pipes and underground openings?
• Natural gas is heavier than air.
• In the group labeled Definition: Water and carbon dioxide, which option is listed first?
• Complete combustion typically produces which products?
• What happens to the volume of natural gas when it is heated?
• What is the ignition temperature for natural gas?
• Which indicators can help detect an abnormal operating condition in a meter system?
• Which component helps prevent accidental downstream pressure spikes by providing a controlled release?
• Knowing the gravity of fuel gases helps predict combustion behavior at the burner tip.
• Which option refers to plastic pipe odor effects?
• What indicates regulator venting or malfunction in the field?
• How much road cover should be above the pipeline in a street or road at minimum unless otherwise specified?
• Which elements should an AOC event report contain?
• What is the function of a pressure relief device on a meter regulator skid?
• Natural gas can be transported in either a gas or liquid form.
• What gas volume units are commonly used on meters, and why is unit consistency important?
• What is the primary purpose of valve position indicators during AOC handling?
• Which of the following is referred to as the fingerprint, or unique to natural gas?
• Which statement about relative density is true?
• Air has a specific gravity closest to which value?
• What is the ideal mixture of natural gas and air for combustion?
• Why are liquids and particulates detrimental to meters and regulators?
• What is the purpose of a test point on a meter assembly?
• Which maintenance tasks are commonly performed on meter assemblies?
• The ignition temperature for natural gas is between 1100 and 1200 degrees.
• Which option notes that odor fade occurs in plastic pipes?
• Which of the following is a common indicator of blowing or escaping gas?
• Incomplete combustion of natural gas can yield which hazardous gas?
• What is the specific gravity of Natural Gas?
• The Specific Gravity of Air is 1.0.
• What is the role of a filtration device in a meter assembly?
• When recording a meter reading for billing, what should be recorded?
• Which safety devices are typically found on a meter/regulator skid?
• What should good acceptable backfill look like?
• Which term describes the maximum concentration of vapor in air that can ignite?
• What is the correct procedure if a leak is detected during a leak test?
• Which safety prerequisite should be followed when performing work near potential gas hazards, including AOC actions?
• What safety practices should be observed near an active regulator vent?
• What is the primary purpose of test ports in a meter assembly?
• Gas accumulates at what point in a confined space?
• Odor masking by soil can lead to what risk?
• Hydrocarbons: which statement is true?
• Which items are common abnormal operating conditions (AOCs) you might encounter in a meter system?
• When should leak checks be performed according to typical practice?
• What information should be recorded when maintaining meter assemblies?
• Which of the following is a sign of component failure?
• Odor fade is related to what factor in soil or pipe context?
• The upper explosive limit refers to the maximum concentration of vapor in air that can ignite.
• Propane has a specific gravity of 0.98.
• What indicates the need to verify flow direction on a meter installation?
• Which statement is associated with sand, clay, or loam in relation to odor?
• When reading a gas meter, in what order should you read the digits and what should you record?
• Which option states the fragment 'Incomplete combustion results in'?
• Prior to excavation you must first call: _____ to receive a dig ticket.
• What is the purpose of a bypass in meter assemblies?
• When natural gas is heated, it does what to its volume?
• Which conditions typically require an immediate gas shutdown?
• What is the purpose of unions and gaskets in a gas meter assembly?
• What is the recommended action if a gas odor is detected near a joint during inspection?
• What should you do if downstream pressure remains higher than regulator setpoint?
• Natural gas can be either transported in either ___ or ____ form.
• How can you detect an AOC in the field?
• When bypass is used during maintenance, which precaution applies?
• What is a primary reason to include test ports on a meter/regulator skid?
• What follow-up action should be taken after an AOC is resolved?
• Which option corresponds to the Specific Gravity Kerosene/Fuel Oil?
• Under Definition 4.5, which option is the Specific Gravity Kerosene/Fuel Oil?
• What effect does natural gas have on oxygen levels in an enclosed space?
• Which condition is most commonly associated with vent blockage in a regulator system?
• Which statement is true about natural gas transport?
• 0.98 is the specific gravity of which substance?
• What is the purpose of test ports or pressure taps on meter assemblies?
• Contamination is a common regulator malfunction cause because it can lead to which outcome?
• What is the typical isolation sequence when performing work on a meter?
• How should outdoor meter assemblies be protected from weather?
• Which statement about odorization is true?
• Third Party Damage is the number one cause of pipeline damage.
• Which soil condition allows gas to flow more freely?
• What is the specific gravity of air?
• In the case of a water main break causing a cave in, how do you react?
• What immediate actions should you take if a gas leak is suspected at the meter?
• Which statement BEST describes an AOC?
• What factors can cause meter drift and how is it corrected?
• Which item is essential to include in an AOC event report for accountability?
• What compound makes up 90%-97% of natural gas?
• Which are common causes of regulator malfunction in AOCs?
• Under Definition 4.5, which option corresponds to the ignition temperature of Gasoline, kerosene, and fuel oil?
• When should bypass be used and what precautions apply?
• Which option best describes incomplete combustion occurring when the appliance is not properly vented?
• What steps should you take when an AOC occurs?
• How is a leak test performed after installation or maintenance?
• Incomplete combustion produces which deadly byproduct?
• Which of the following describes an AOC?
• Which item is typically included as part of a standard gas meter assembly?
• Which option corresponds to the ignition temperature of Gasoline, kerosene, and fuel oil?
• What indicates the intended flow direction on a meter?
• What is the largest component of natural gas?
• What are signs of a damaged gasket at a joint?
• Knowing the gravity of fuel gases helps you understand combustion properties at the burner tip.
• A likely cause for a large \"no heat\" area?
• Under Definition 4.5, which option is the Ignition temperature of Propane?
• Natural gas travels in the path of:
• What defines an Abnormal Operating Condition (AOC) for gas/meter systems?
• Odor intensity can decrease due to the presence of an absorbing substance on or in the pipe.
• Why should you not modify a meter assembly without authorization?
• If you detect a gas odor at the meter, what is a prioritized action?
• The chemical the gas company uses to make natural gas detectable to our senses.
• Which option identifies a venting-related issue statement?
• An excavator must wait until 7 am on the ____ day to begin excavation.
• In a street excavation, minimum road cover above a buried pipeline is how many inches?
• What is the major component of natural gas?
• What are three things needed for combustion?
• Which statement accurately describes the relationship between natural gas and air SG values as provided?
• What is the specific gravity of Air?
• Which safety practice should be used when required during meter work to ensure isolation?
• What is the purpose of a flow straightener in front of a meter?
• Why should AOC events be logged?
• The odorant added to natural gas is to provide a distinctive odor.
• Natural gas is a toxic compound.
• Which of the following statements regarding AOC definitions is true?
• Distinguish test ports from sampling taps on a meter assembly.
• What could cause gas to blow out of a regulator?
• When documenting maintenance, which element is essential to determine future service needs?
• Which option states that odor fade occurs in plastic pipes?