NM LP-5 INSTALLATION SERVICE AND REPAIR
EXAMINATION COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST RELEASED
Exam Coverage Summary
1. LP-Gas Properties and Characteristics – Physical properties, vapour pressure, ignition
temperatures, expansion ratios, and safe handling practices.
2. Codes, Standards, and Regulations – NFPA 54, NFPA 58, New Mexico regulations, licensing
requirements, permits, and inspections.
3. Safety Procedures – Leak detection, emergency response, fire prevention, personal protective
equipment (PPE), and hazard recognition.
4. Containers and Cylinders – Installation requirements, inspection procedures, corrosion
protection, sizing, recertification, and transportation.
5. Piping Systems – Materials, sizing, regulators, fittings, supports, pressure testing, purging, and
corrosion prevention.
6. Regulators and Pressure Controls – First-stage, second-stage, integral two-stage regulators,
venting requirements, lock-up testing, and troubleshooting.
7. Appliance Installation and Venting – Installation standards, combustion air requirements, vent
systems, clearances, and operational testing.
8. Service, Maintenance, and Repair – Troubleshooting appliances, replacing components,
diagnosing leaks, regulator failures, and system performance.
9. Testing and Commissioning – Pressure testing, leak testing, purging procedures, lighting
appliances, documenting work, and customer education.
10. Workplace Safety and Professional Practices – Safe work habits, lockout procedures,
documentation, customer communication, and ethical responsibilities.
NM LP-5 Installation Service and Repair Examination
Question 1
Which statement best explains why propane technicians should always verify that every
appliance shutoff valve is closed before introducing gas into a newly installed piping system
after completing pressure testing and before beginning appliance startup procedures?
A. It reduces the amount of propane required to fill the system.
,B. It prevents uncontrolled gas flow into appliances and reduces the risk of hazardous gas
accumulation.
C. It increases gas pressure throughout the entire piping network.
D. It eliminates the need for leak testing.
Answer: B
Rationale: Closed appliance valves prevent gas from entering appliances unexpectedly during
system charging, reducing explosion and fire hazards while allowing controlled commissioning.
Question 2
During a routine installation service visit, which propane property most directly explains why
leaking propane frequently collects in low-lying areas instead of quickly dispersing into the
atmosphere?
A. Propane is lighter than oxygen.
B. Propane is heavier than air.
C. Propane is chemically unstable.
D. Propane contains excess moisture.
Answer: B
Rationale: Propane vapour is heavier than air and naturally settles in basements, pits, trenches,
and other low areas, increasing ignition hazards.
Question 3
Which action should a licensed LP-Gas technician perform first after discovering a significant
propane leak inside an occupied residential structure during a scheduled repair appointment?
A. Turn on ceiling fans to ventilate the building.
B. Shut off the gas supply if it can be done safely and evacuate occupants.
,C. Relight all pilot lights.
D. Continue repairing the appliance.
Answer: B
Rationale: Life safety is always the first priority. Gas flow should be stopped safely, occupants
evacuated, and emergency procedures followed before repairs continue.
Question 4
When pressure testing a newly installed propane piping system, why is using compressed air or
inert gas generally preferred instead of propane during the initial pressure test?
A. Propane is too expensive.
B. Propane changes colour during testing.
C. Air or inert gas eliminates unnecessary fire and explosion hazards during testing.
D. Propane damages testing equipment.
Answer: C
Rationale: Pressure testing with non-flammable media greatly reduces ignition risks before gas
is introduced into the system.
Question 5
Which installation practice best helps protect aboveground propane piping from mechanical
damage while maintaining long-term system safety and code compliance?
A. Leaving piping unsupported.
B. Supporting piping securely and protecting exposed sections from physical damage.
C. Painting regulators.
D. Installing flexible connectors throughout the entire piping system.
, Answer: B
Rationale: Proper supports and physical protection minimise stress, vibration, and accidental
impacts that may cause leaks.
Question 6
A propane service technician notices corrosion developing on exposed steel piping during an
annual inspection. Which action provides the most appropriate corrective measure before the
corrosion compromises system integrity?
A. Cover the corrosion with insulation.
B. Clean, evaluate, protect, or replace the affected piping as necessary.
C. Increase gas pressure.
D. Ignore superficial rust.
Answer: B
Rationale: Corrosion can weaken piping over time. Proper evaluation and corrective action
preserve safety and compliance.
Question 7
Which statement best describes the primary purpose of a first-stage regulator in a two-stage
propane distribution system serving residential appliances?
A. It completely shuts off gas flow.
B. It reduces high container pressure to an intermediate pressure before second-stage
regulation.
C. It increases gas pressure.
D. It measures gas consumption.
Answer: B
EXAMINATION COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST RELEASED
Exam Coverage Summary
1. LP-Gas Properties and Characteristics – Physical properties, vapour pressure, ignition
temperatures, expansion ratios, and safe handling practices.
2. Codes, Standards, and Regulations – NFPA 54, NFPA 58, New Mexico regulations, licensing
requirements, permits, and inspections.
3. Safety Procedures – Leak detection, emergency response, fire prevention, personal protective
equipment (PPE), and hazard recognition.
4. Containers and Cylinders – Installation requirements, inspection procedures, corrosion
protection, sizing, recertification, and transportation.
5. Piping Systems – Materials, sizing, regulators, fittings, supports, pressure testing, purging, and
corrosion prevention.
6. Regulators and Pressure Controls – First-stage, second-stage, integral two-stage regulators,
venting requirements, lock-up testing, and troubleshooting.
7. Appliance Installation and Venting – Installation standards, combustion air requirements, vent
systems, clearances, and operational testing.
8. Service, Maintenance, and Repair – Troubleshooting appliances, replacing components,
diagnosing leaks, regulator failures, and system performance.
9. Testing and Commissioning – Pressure testing, leak testing, purging procedures, lighting
appliances, documenting work, and customer education.
10. Workplace Safety and Professional Practices – Safe work habits, lockout procedures,
documentation, customer communication, and ethical responsibilities.
NM LP-5 Installation Service and Repair Examination
Question 1
Which statement best explains why propane technicians should always verify that every
appliance shutoff valve is closed before introducing gas into a newly installed piping system
after completing pressure testing and before beginning appliance startup procedures?
A. It reduces the amount of propane required to fill the system.
,B. It prevents uncontrolled gas flow into appliances and reduces the risk of hazardous gas
accumulation.
C. It increases gas pressure throughout the entire piping network.
D. It eliminates the need for leak testing.
Answer: B
Rationale: Closed appliance valves prevent gas from entering appliances unexpectedly during
system charging, reducing explosion and fire hazards while allowing controlled commissioning.
Question 2
During a routine installation service visit, which propane property most directly explains why
leaking propane frequently collects in low-lying areas instead of quickly dispersing into the
atmosphere?
A. Propane is lighter than oxygen.
B. Propane is heavier than air.
C. Propane is chemically unstable.
D. Propane contains excess moisture.
Answer: B
Rationale: Propane vapour is heavier than air and naturally settles in basements, pits, trenches,
and other low areas, increasing ignition hazards.
Question 3
Which action should a licensed LP-Gas technician perform first after discovering a significant
propane leak inside an occupied residential structure during a scheduled repair appointment?
A. Turn on ceiling fans to ventilate the building.
B. Shut off the gas supply if it can be done safely and evacuate occupants.
,C. Relight all pilot lights.
D. Continue repairing the appliance.
Answer: B
Rationale: Life safety is always the first priority. Gas flow should be stopped safely, occupants
evacuated, and emergency procedures followed before repairs continue.
Question 4
When pressure testing a newly installed propane piping system, why is using compressed air or
inert gas generally preferred instead of propane during the initial pressure test?
A. Propane is too expensive.
B. Propane changes colour during testing.
C. Air or inert gas eliminates unnecessary fire and explosion hazards during testing.
D. Propane damages testing equipment.
Answer: C
Rationale: Pressure testing with non-flammable media greatly reduces ignition risks before gas
is introduced into the system.
Question 5
Which installation practice best helps protect aboveground propane piping from mechanical
damage while maintaining long-term system safety and code compliance?
A. Leaving piping unsupported.
B. Supporting piping securely and protecting exposed sections from physical damage.
C. Painting regulators.
D. Installing flexible connectors throughout the entire piping system.
, Answer: B
Rationale: Proper supports and physical protection minimise stress, vibration, and accidental
impacts that may cause leaks.
Question 6
A propane service technician notices corrosion developing on exposed steel piping during an
annual inspection. Which action provides the most appropriate corrective measure before the
corrosion compromises system integrity?
A. Cover the corrosion with insulation.
B. Clean, evaluate, protect, or replace the affected piping as necessary.
C. Increase gas pressure.
D. Ignore superficial rust.
Answer: B
Rationale: Corrosion can weaken piping over time. Proper evaluation and corrective action
preserve safety and compliance.
Question 7
Which statement best describes the primary purpose of a first-stage regulator in a two-stage
propane distribution system serving residential appliances?
A. It completely shuts off gas flow.
B. It reduces high container pressure to an intermediate pressure before second-stage
regulation.
C. It increases gas pressure.
D. It measures gas consumption.
Answer: B
