New Mexico (NM) LP-5 Installation, Service & Repair
Practice Exam — 300 Questions with Correct
Answers and Rationales
300 QUESTIONS
TABLE OF CONTENTS
# TOPIC
New Mexico (NM) LP-5 Installation, Service & Repair Practice Exam — 300 Questions with Correct
1
Answers and Rationales
Page 1
,Q1
Under New Mexico Regulation and Licensing Department (RLD), what is the primary scope of
work authorized by an LP-5 license?
A) Residential electrical wiring up to 200A
B) Installation and repair of appliances, equipment, and piping for use with LP
CORRECT
gas in residences and commercial buildings
C) Journeyman electrician work for low voltage systems
D) HVAC ductwork and hydronic piping systems
Rationale
An LP-5 license specifically authorizes the installation, service, and repair of appliances, equipment, and
piping for LP gas use in residential and commercial buildings, including mobile homes and RVs. The
scope does NOT include HVAC ductwork or hydronic piping systems .
Q2
Which New Mexico state agency issues LP-5 certification?
A) New Mexico Construction Industries Division (CID) CORRECT
B) New Mexico Environment Department
C) New Mexico Regulation and Licensing Department
D) New Mexico Department of Health
Rationale
The Construction Industries Division (CID) of the New Mexico Regulation and Licensing Department
issues LP-5 certifications .
Q3
Which New Mexico statute defines the qualifications required for an LP-5 contractor?
A) NMSA 1978, Chapter 60, Article 6
B) NMSA 1978, Chapter 53, Article 7
C) NMSA 1978, Chapter 60, Article 7 CORRECT
D) NMSA 1978, Chapter 53, Article 6
Page 2
,Rationale
Chapter 60, Article 7 of the New Mexico Statutes outlines the licensing requirements for LP-5
contractors, including experience, bonding, and insurance .
Q4
Which New Mexico regulation specifically defines the license classifications and fees for LP-gas
work?
A) NMAC 14.10
B) NMAC 14.9.5
C) NMAC 19.15.40 CORRECT
D) NMAC 14.7.7
Rationale
NMAC 19.15.40 is the New Mexico Administrative Code section that defines license classifications,
scopes, and fees for LP-gas work .
Q5
What is the minimum percentage of propane in propane-air mixtures used for testing?
A) 10%
B) 25%
C) 50% CORRECT
D) 100%
Rationale
Propane-air mixtures used for testing must contain at least 50% propane to ensure accurate leak
detection .
Page 3
, Q6
According to NM regulations, what is the maximum working pressure for low-pressure gas
piping?
A) 0.5 psi (14″ w.c.) CORRECT
B) 2 psi
C) 5 psi
D) 10 psi
Rationale
Low-pressure gas piping systems operate at 0.5 psi or 14 inches of water column (w.c.) maximum .
Q7
What is the primary purpose of a sediment trap (drip leg) in a gas piping system?
A) To increase gas pressure
B) To remove moisture and debris from gas CORRECT
C) To measure gas flow
D) To reduce gas odor
Rationale
Sediment traps collect moisture, dirt, and debris from gas lines before they can enter appliances .
Q8
How long should a gas piping system be pressure tested?
A) 5 minutes
B) 10 minutes CORRECT
C) 30 minutes
D) 1 hour
Rationale
Gas piping systems should be pressure tested for at least 10 minutes .
Page 4
Practice Exam — 300 Questions with Correct
Answers and Rationales
300 QUESTIONS
TABLE OF CONTENTS
# TOPIC
New Mexico (NM) LP-5 Installation, Service & Repair Practice Exam — 300 Questions with Correct
1
Answers and Rationales
Page 1
,Q1
Under New Mexico Regulation and Licensing Department (RLD), what is the primary scope of
work authorized by an LP-5 license?
A) Residential electrical wiring up to 200A
B) Installation and repair of appliances, equipment, and piping for use with LP
CORRECT
gas in residences and commercial buildings
C) Journeyman electrician work for low voltage systems
D) HVAC ductwork and hydronic piping systems
Rationale
An LP-5 license specifically authorizes the installation, service, and repair of appliances, equipment, and
piping for LP gas use in residential and commercial buildings, including mobile homes and RVs. The
scope does NOT include HVAC ductwork or hydronic piping systems .
Q2
Which New Mexico state agency issues LP-5 certification?
A) New Mexico Construction Industries Division (CID) CORRECT
B) New Mexico Environment Department
C) New Mexico Regulation and Licensing Department
D) New Mexico Department of Health
Rationale
The Construction Industries Division (CID) of the New Mexico Regulation and Licensing Department
issues LP-5 certifications .
Q3
Which New Mexico statute defines the qualifications required for an LP-5 contractor?
A) NMSA 1978, Chapter 60, Article 6
B) NMSA 1978, Chapter 53, Article 7
C) NMSA 1978, Chapter 60, Article 7 CORRECT
D) NMSA 1978, Chapter 53, Article 6
Page 2
,Rationale
Chapter 60, Article 7 of the New Mexico Statutes outlines the licensing requirements for LP-5
contractors, including experience, bonding, and insurance .
Q4
Which New Mexico regulation specifically defines the license classifications and fees for LP-gas
work?
A) NMAC 14.10
B) NMAC 14.9.5
C) NMAC 19.15.40 CORRECT
D) NMAC 14.7.7
Rationale
NMAC 19.15.40 is the New Mexico Administrative Code section that defines license classifications,
scopes, and fees for LP-gas work .
Q5
What is the minimum percentage of propane in propane-air mixtures used for testing?
A) 10%
B) 25%
C) 50% CORRECT
D) 100%
Rationale
Propane-air mixtures used for testing must contain at least 50% propane to ensure accurate leak
detection .
Page 3
, Q6
According to NM regulations, what is the maximum working pressure for low-pressure gas
piping?
A) 0.5 psi (14″ w.c.) CORRECT
B) 2 psi
C) 5 psi
D) 10 psi
Rationale
Low-pressure gas piping systems operate at 0.5 psi or 14 inches of water column (w.c.) maximum .
Q7
What is the primary purpose of a sediment trap (drip leg) in a gas piping system?
A) To increase gas pressure
B) To remove moisture and debris from gas CORRECT
C) To measure gas flow
D) To reduce gas odor
Rationale
Sediment traps collect moisture, dirt, and debris from gas lines before they can enter appliances .
Q8
How long should a gas piping system be pressure tested?
A) 5 minutes
B) 10 minutes CORRECT
C) 30 minutes
D) 1 hour
Rationale
Gas piping systems should be pressure tested for at least 10 minutes .
Page 4
