Maryland Master Natural Gas Fitter
Exam Practice Questions And Correct
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Rationales 2026 Q&A Instant Download
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1. Which of the following is the most common type of gas used in residential
natural gas systems?
A. Propane
B. Methane (Natural Gas)
C. Butane
D. Hydrogen
Rationale: Natural gas is primarily composed of methane, making it the
standard fuel for residential applications.
2. What is the minimum clearance required from a gas-fired appliance to
combustible materials?
A. 0 inches
B. 1 inch
C. 6 inches
D. 12 inches
Rationale: Most codes require a minimum of 6 inches clearance to prevent
fire hazards around gas appliances.
,3. When sizing a gas pipe, which factor is NOT considered?
A. Length of the pipe
B. Number of fittings
C. Type of gas
D. Color of the pipe
Rationale: Pipe color has no effect on gas flow or pressure and is not a
factor in sizing.
4. The purpose of a gas pressure regulator is to:
A. Increase pressure
B. Store gas
C. Reduce and control pressure
D. Heat gas
Rationale: Regulators reduce high supply pressure to a safe, usable level
for appliances.
5. Which tool is best for detecting gas leaks?
A. Hammer
B. Wrench
C. Soap solution
D. Screwdriver
Rationale: Soap solution applied to joints will bubble when gas is leaking,
indicating a leak.
6. How often must gas appliances be inspected according to Maryland
regulations?
A. Every month
B. Every 2 years
C. Annually
D. Only at installation
Rationale: Annual inspections are recommended to ensure safety and
code compliance.
7. In gas piping, the letters “CSST” refer to:
A. Copper Standard Steel Tubing
, B. Corrugated Stainless Steel Tubing
C. Carbon Steel Seamless Tube
D. Compressed Safety Supply Tube
Rationale: CSST is a flexible stainless steel tubing used for gas distribution
in buildings.
8. What is the typical maximum inlet pressure for residential natural gas
appliances?
A. 0.25 psi
B. 0.5 psi
C. 1 psi
D. 5 psi
Rationale: Residential appliances are designed to operate at a maximum
of 0.5 psi (14 inches water column).
9. Which material is NOT approved for natural gas distribution in Maryland?
A. Black steel
B. PVC
C. CSST
D. Copper (with approved fittings)
Rationale: PVC is not permitted for natural gas because it can fail under
pressure and heat.
10.A “union” fitting is used to:
A. Change direction of a pipe
B. Join two pipes for easy disconnection
C. Reduce pipe size
D. Seal a pipe permanently
Rationale: Unions allow sections of pipe to be easily disconnected for
maintenance.
11.The purpose of a vent on a gas water heater is to:
A. Supply air to the room
B. Exhaust combustion gases safely
C. Increase water pressure
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. Which of the following is the most common type of gas used in residential
natural gas systems?
A. Propane
B. Methane (Natural Gas)
C. Butane
D. Hydrogen
Rationale: Natural gas is primarily composed of methane, making it the
standard fuel for residential applications.
2. What is the minimum clearance required from a gas-fired appliance to
combustible materials?
A. 0 inches
B. 1 inch
C. 6 inches
D. 12 inches
Rationale: Most codes require a minimum of 6 inches clearance to prevent
fire hazards around gas appliances.
,3. When sizing a gas pipe, which factor is NOT considered?
A. Length of the pipe
B. Number of fittings
C. Type of gas
D. Color of the pipe
Rationale: Pipe color has no effect on gas flow or pressure and is not a
factor in sizing.
4. The purpose of a gas pressure regulator is to:
A. Increase pressure
B. Store gas
C. Reduce and control pressure
D. Heat gas
Rationale: Regulators reduce high supply pressure to a safe, usable level
for appliances.
5. Which tool is best for detecting gas leaks?
A. Hammer
B. Wrench
C. Soap solution
D. Screwdriver
Rationale: Soap solution applied to joints will bubble when gas is leaking,
indicating a leak.
6. How often must gas appliances be inspected according to Maryland
regulations?
A. Every month
B. Every 2 years
C. Annually
D. Only at installation
Rationale: Annual inspections are recommended to ensure safety and
code compliance.
7. In gas piping, the letters “CSST” refer to:
A. Copper Standard Steel Tubing
, B. Corrugated Stainless Steel Tubing
C. Carbon Steel Seamless Tube
D. Compressed Safety Supply Tube
Rationale: CSST is a flexible stainless steel tubing used for gas distribution
in buildings.
8. What is the typical maximum inlet pressure for residential natural gas
appliances?
A. 0.25 psi
B. 0.5 psi
C. 1 psi
D. 5 psi
Rationale: Residential appliances are designed to operate at a maximum
of 0.5 psi (14 inches water column).
9. Which material is NOT approved for natural gas distribution in Maryland?
A. Black steel
B. PVC
C. CSST
D. Copper (with approved fittings)
Rationale: PVC is not permitted for natural gas because it can fail under
pressure and heat.
10.A “union” fitting is used to:
A. Change direction of a pipe
B. Join two pipes for easy disconnection
C. Reduce pipe size
D. Seal a pipe permanently
Rationale: Unions allow sections of pipe to be easily disconnected for
maintenance.
11.The purpose of a vent on a gas water heater is to:
A. Supply air to the room
B. Exhaust combustion gases safely
C. Increase water pressure
