NEW MEXICO MM-98 MECHANICAL CONTRACTOR
EXAM NEWEST 2025-2026 UPDATE REAL PRACTICE
EXAM QUESTIONS & CORRECT ANSWERS |
ALREADY GRADED A+
Content Covered (Most Tested Areas):
Business & Law
New Mexico Construction Regulations
International Mechanical Code (IMC)
International Fuel Gas Code (IFGC)
International Plumbing Code (IPC – limited scope)
HVAC Systems & Installation
Duct Systems
Combustion Air & Venting
Load Calculations
Refrigeration Principles
Safety (OSHA)
Hydronics & Boilers
1. What is the minimum required experience to qualify for the MM-
98 Mechanical Contractor license in New Mexico?
A. 1 year
B. 2 years
C. 4 years
D. 6 years
,Answer: C. 4 years
The Construction Industries Division requires four years of qualifying
experience in mechanical contracting before examination eligibility.
2. A mechanical contractor in New Mexico must renew their license
every:
A. 1 year
B. 2 years
C. 3 years
D. 5 years
Answer: C. 3 years
New Mexico mechanical contractor licenses are renewed on a three-
year cycle.
3. According to IMC, access to appliances located in attics must be
provided by an opening not less than:
A. 16 × 20 inches
B. 20 × 20 inches
C. 22 × 30 inches
D. 24 × 24 inches
Answer: C. 22 × 30 inches
IMC requires a minimum attic access opening of 22 inches by 30 inches.
4. Minimum slope for horizontal fuel gas piping (condensate
drainage for certain appliances) is:
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. Level
,Answer: C. 1/4 inch per foot
Fuel gas vent connectors and condensate drainage systems require 1/4
inch per foot slope unless otherwise specified.
5. What is the minimum combustion air opening size requirement
when taken from indoor spaces?
A. 1 sq in per 1000 BTU/hr
B. 1 sq in per 2000 BTU/hr
C. 1 sq in per 4000 BTU/hr
D. 1 sq in per 10,000 BTU/hr
Answer: A. 1 sq in per 1000 BTU/hr
Indoor combustion air is calculated at 1 square inch per 1,000 BTU/hr
input.
6. According to OSHA, trench protection is required at depths
greater than:
A. 3 feet
B. 4 feet
C. 5 feet
D. 6 feet
Answer: C. 5 feet
OSHA requires protective systems in excavations 5 feet or deeper unless
in stable rock.
7. The minimum clearance between single-wall vent connector and
combustible materials is:
A. 1 inch
B. 3 inches
C. 6 inches
D. 12 inches
, Answer: C. 6 inches
IMC specifies 6 inches minimum clearance for single-wall vent
connectors.
8. A Category I gas appliance operates under:
A. Positive vent pressure
B. Negative vent pressure
C. Sealed combustion only
D. Condensing mode
Answer: B. Negative vent pressure
Category I appliances operate under negative vent static pressure and
non-condensing conditions.
9. The minimum R-value for supply ducts installed in unconditioned
spaces is typically:
A. R-4
B. R-6
C. R-8
D. R-10
Answer: B. R-6
Energy codes typically require R-6 insulation for ducts in unconditioned
spaces.
10. The formula for calculating airflow (CFM) in a rectangular
duct is:
A. Length × Width
B. Velocity × Area
C. Pressure × Volume
D. Area ÷ Velocity
EXAM NEWEST 2025-2026 UPDATE REAL PRACTICE
EXAM QUESTIONS & CORRECT ANSWERS |
ALREADY GRADED A+
Content Covered (Most Tested Areas):
Business & Law
New Mexico Construction Regulations
International Mechanical Code (IMC)
International Fuel Gas Code (IFGC)
International Plumbing Code (IPC – limited scope)
HVAC Systems & Installation
Duct Systems
Combustion Air & Venting
Load Calculations
Refrigeration Principles
Safety (OSHA)
Hydronics & Boilers
1. What is the minimum required experience to qualify for the MM-
98 Mechanical Contractor license in New Mexico?
A. 1 year
B. 2 years
C. 4 years
D. 6 years
,Answer: C. 4 years
The Construction Industries Division requires four years of qualifying
experience in mechanical contracting before examination eligibility.
2. A mechanical contractor in New Mexico must renew their license
every:
A. 1 year
B. 2 years
C. 3 years
D. 5 years
Answer: C. 3 years
New Mexico mechanical contractor licenses are renewed on a three-
year cycle.
3. According to IMC, access to appliances located in attics must be
provided by an opening not less than:
A. 16 × 20 inches
B. 20 × 20 inches
C. 22 × 30 inches
D. 24 × 24 inches
Answer: C. 22 × 30 inches
IMC requires a minimum attic access opening of 22 inches by 30 inches.
4. Minimum slope for horizontal fuel gas piping (condensate
drainage for certain appliances) is:
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. Level
,Answer: C. 1/4 inch per foot
Fuel gas vent connectors and condensate drainage systems require 1/4
inch per foot slope unless otherwise specified.
5. What is the minimum combustion air opening size requirement
when taken from indoor spaces?
A. 1 sq in per 1000 BTU/hr
B. 1 sq in per 2000 BTU/hr
C. 1 sq in per 4000 BTU/hr
D. 1 sq in per 10,000 BTU/hr
Answer: A. 1 sq in per 1000 BTU/hr
Indoor combustion air is calculated at 1 square inch per 1,000 BTU/hr
input.
6. According to OSHA, trench protection is required at depths
greater than:
A. 3 feet
B. 4 feet
C. 5 feet
D. 6 feet
Answer: C. 5 feet
OSHA requires protective systems in excavations 5 feet or deeper unless
in stable rock.
7. The minimum clearance between single-wall vent connector and
combustible materials is:
A. 1 inch
B. 3 inches
C. 6 inches
D. 12 inches
, Answer: C. 6 inches
IMC specifies 6 inches minimum clearance for single-wall vent
connectors.
8. A Category I gas appliance operates under:
A. Positive vent pressure
B. Negative vent pressure
C. Sealed combustion only
D. Condensing mode
Answer: B. Negative vent pressure
Category I appliances operate under negative vent static pressure and
non-condensing conditions.
9. The minimum R-value for supply ducts installed in unconditioned
spaces is typically:
A. R-4
B. R-6
C. R-8
D. R-10
Answer: B. R-6
Energy codes typically require R-6 insulation for ducts in unconditioned
spaces.
10. The formula for calculating airflow (CFM) in a rectangular
duct is:
A. Length × Width
B. Velocity × Area
C. Pressure × Volume
D. Area ÷ Velocity
