ICC MM98J HVAC Mechanical Journeyman Examination Study Guide and Practice Q&A

ICC MM98J HVAC Mechanical Journeyman Examination
Study Guide and Practice Q&A




Question 1. What is the primary purpose of mechanical codes?
A. Protect public health and safety
B. Increase utility costs only
C. Improve paint quality only
D. Reduce inspections only

Correct Answer: A

Rationale: Mechanical codes establish minimum safety standards for mechanical systems to
safeguard public health and safety.



Question 2. HVAC stands for:
A. Heating, Ventilation, and Air Conditioning
B. Heating, Voltage, and Cooling
C. High Ventilation Air Control
D. Heat Valve and Condensation

Correct Answer: A

Rationale: HVAC systems provide indoor climate control and ventilation.



Question 3. Combustion air is required for fuel-burning appliances to:
A. Support safe combustion
B. Increase airflow only
C. Reduce humidity only
D. Improve lighting only

Correct Answer: A

Rationale: Fuel-burning appliances require oxygen for proper combustion.

,Question 4. Ventilation systems are intended to:
A. Maintain indoor air quality
B. Increase plumbing pressure only
C. Improve roofing only
D. Support electrical systems only

Correct Answer: A

Rationale: Ventilation removes contaminants and provides fresh air.



Question 5. Exhaust systems are commonly used to remove:
A. Moisture, fumes, and contaminants
B. Structural loads only
C. Electrical current only
D. Plumbing waste only

Correct Answer: A

Rationale: Exhaust systems improve occupant safety and comfort.



Question 6. Duct systems should generally be:
A. Properly sealed and supported
B. Left unsealed intentionally
C. Used as plumbing chases only
D. Installed without insulation only

Correct Answer: A

Rationale: Proper duct installation improves efficiency and safety.



Question 7. Fire dampers are intended to:
A. Restrict fire spread through ducts
B. Increase airflow only
C. Reduce insulation only
D. Improve lighting only

Correct Answer: A

Rationale: Fire dampers protect fire-rated assemblies.

,Question 8. Smoke dampers are intended to:
A. Restrict smoke movement
B. Increase airflow only
C. Improve acoustics only
D. Support ceilings only

Correct Answer: A

Rationale: Smoke dampers assist smoke control systems.



Question 9. Fuel gas piping systems should be tested to verify:
A. Leak-free installation
B. Paint adhesion only
C. Increase gas pressure only
D. Reduce airflow only

Correct Answer: A

Rationale: Fuel gas piping must be tested for leaks to ensure safety.



Question 10. Makeup air systems are intended to:
A. Replace exhausted air
B. Increase humidity only
C. Reduce airflow only
D. Support plumbing only

Correct Answer: A

Rationale: Makeup air replaces air removed by exhaust systems.



Question 11. When mechanical equipment is located on a flat roof that is 8 feet above grade,
how far from the roof edge must the equipment be located before a guard rail is not needed?
A. Less than 6 feet
B. 9 feet
C. 4 feet
D. More than 10 feet

, Correct Answer: D

Rationale: Equipment located more than 10 feet from the roof edge does not require a guard
rail.



Question 12. A room that measures 10 x 20 x 8 contains a 35,000 BTU woodburning stove in a
building classified as unusually tight construction. What size combustion air openings will be
required if they are installed directly in a sidewall?
A. 100 sq in
B. 17.5 sq in
C. 11.6 sq in
D. 8.7 sq in

Correct Answer: D

Rationale: The required combustion air opening size is calculated based on the appliance input
and construction tightness.



Question 13. How many BTUs are in 1 ton of refrigeration?
A. 12 BTUs
B. 120 BTUs
C. 1,200 BTUs
D. 12,000 BTUs

Correct Answer: D

Rationale: One ton of refrigeration equals 12,000 BTUs per hour.



Question 14. Which refrigerant is not classified as a flammable refrigerant?
A. Class A
B. Class C
C. Class 2
D. Class 1

Correct Answer: D

Rationale: Class 1 refrigerants are not classified as flammable.