HVAC INSPECTOR CERTIFICATION
EXAMINATION — 200 Practice
Questions with Verified Answers
[Graded A+]
1. What is the primary purpose of the mechanical code?
• A) Reduce construction costs
• B) Improve aesthetic design
• C) Ensure safety, health, and welfare of occupants
• D) Simplify HVAC system sizing
Answer: C
2. According to the IMC, the definition of "concealed" means:
• A) Hidden from view only
• B) Accessible but not visible
• C) Rendered inaccessible by the structure or finish of the building
• D) Installed behind a removable access panel
Answer: C
3. According to the IMC, which of the following describes an
"accessible" appliance?
• A) Visible from any location
• B) Having access that requires the removal of permanent
construction
• C) Having access that does not require the removal of permanent
construction
• D) Located in a mechanical room
Answer: C
Safety & Personal Protective Equipment (PPE)
,4. Before beginning an HVAC inspection, the inspector should first:
• A) Turn on the system at the thermostat
• B) Verify that the area is safe (no standing water, electrical hazards,
or gas leaks)
• C) Remove the furnace access panel
• D) Check the air filter
Answer: B
5. When inspecting an HVAC system in a crawlspace, what is the
most important PPE?
• A) Hard hat
• B) Respirator with N95 or higher rating, gloves, and eye protection
• C) Steel-toed boots
• D) Hearing protection
Answer: B
6. An inspector finds a disconnected furnace flue pipe. What is the
immediate safety concern?
• A) Loss of heating efficiency
• B) Carbon monoxide may spill into the living space
• C) The furnace will not ignite
• D) Increased energy bills
Answer: B
System Components & Operation
7. In a standard residential air conditioning system, the refrigerant
in the larger-diameter line (suction line) is:
• A) High-pressure liquid
• B) Low-pressure vapor
• C) High-pressure vapor
• D) Low-pressure liquid
Answer: B
8. The _____ is considered the heart of the air conditioning system.
• A) Compressor
, • B) Evaporator coil
• C) Condenser coil
• D) Fan
Answer: A
9. A thermocouple is a safety device that:
• A) Shuts off the flow of gas if the pilot light goes out.
• B) Controls the temperature of the supply air.
• C) Measures the airflow across the evaporator coil.
• D) Prevents the system from freezing.
Answer: A
Code Compliance & Installation Requirements
10. What is the minimum clearance required in front of the control
side of an appliance for servicing?
• A) 24 inches
• B) 30 inches
• C) 36 inches
• D) 48 inches
Answer: B (Note: IRC M1305.1 specifies 30 inches)
11. Where an appliance is installed in an attic, the clear access
opening must be a minimum of:
• A) 20 inches x 30 inches
• B) 22 inches x 30 inches
• C) 30 inches x 30 inches
• D) 36 inches x 36 inches
Answer: B (Based on IRC M1305.1.3)
12. For an appliance with an ignition source located in a garage, the
source of ignition shall be a minimum of ____ above the garage
floor.
• A) 12 inches
• B) 18 inches
• C) 36 inches
, • D) 48 inches
Answer: B (Based on IRC M1307.3)
13. According to the IMC, a mechanical permit typically becomes
invalid if work is not commenced within how many days of issue?
• A) 90 days
• B) 120 days
• C) 180 days
• D) 365 days
Answer: C
• 14. ASHRAE Standard 180 primarily helps facility managers:
A) Design new HVAC systems
B) Establish maintenance schedules and procedures
C) Eliminate HVAC systems
D) Replace building codes
Rationale: ASHRAE Standard 180 provides guidelines for establishing
HVAC inspection and maintenance procedures to ensure system
performance and longevity.
• 15. The most common refrigerant used in existing modern
residential or light commercial air conditioning systems is:
A) R-12
B) R-22
C) R-134a
D) R-410A
Rationale: R-410A is the standard refrigerant for new residential and
light commercial systems. R-22 is being phased out, and R-12 is
obsolete.
• 16. Refrigerant 410 has special characteristics including higher
operating pressure, a small temperature glide and is:
A) an azeotrope
B) a near azeotrope
C) a zoetrope
D) a CFC
Rationale: R-410A is a near-azeotropic blend, meaning its
EXAMINATION — 200 Practice
Questions with Verified Answers
[Graded A+]
1. What is the primary purpose of the mechanical code?
• A) Reduce construction costs
• B) Improve aesthetic design
• C) Ensure safety, health, and welfare of occupants
• D) Simplify HVAC system sizing
Answer: C
2. According to the IMC, the definition of "concealed" means:
• A) Hidden from view only
• B) Accessible but not visible
• C) Rendered inaccessible by the structure or finish of the building
• D) Installed behind a removable access panel
Answer: C
3. According to the IMC, which of the following describes an
"accessible" appliance?
• A) Visible from any location
• B) Having access that requires the removal of permanent
construction
• C) Having access that does not require the removal of permanent
construction
• D) Located in a mechanical room
Answer: C
Safety & Personal Protective Equipment (PPE)
,4. Before beginning an HVAC inspection, the inspector should first:
• A) Turn on the system at the thermostat
• B) Verify that the area is safe (no standing water, electrical hazards,
or gas leaks)
• C) Remove the furnace access panel
• D) Check the air filter
Answer: B
5. When inspecting an HVAC system in a crawlspace, what is the
most important PPE?
• A) Hard hat
• B) Respirator with N95 or higher rating, gloves, and eye protection
• C) Steel-toed boots
• D) Hearing protection
Answer: B
6. An inspector finds a disconnected furnace flue pipe. What is the
immediate safety concern?
• A) Loss of heating efficiency
• B) Carbon monoxide may spill into the living space
• C) The furnace will not ignite
• D) Increased energy bills
Answer: B
System Components & Operation
7. In a standard residential air conditioning system, the refrigerant
in the larger-diameter line (suction line) is:
• A) High-pressure liquid
• B) Low-pressure vapor
• C) High-pressure vapor
• D) Low-pressure liquid
Answer: B
8. The _____ is considered the heart of the air conditioning system.
• A) Compressor
, • B) Evaporator coil
• C) Condenser coil
• D) Fan
Answer: A
9. A thermocouple is a safety device that:
• A) Shuts off the flow of gas if the pilot light goes out.
• B) Controls the temperature of the supply air.
• C) Measures the airflow across the evaporator coil.
• D) Prevents the system from freezing.
Answer: A
Code Compliance & Installation Requirements
10. What is the minimum clearance required in front of the control
side of an appliance for servicing?
• A) 24 inches
• B) 30 inches
• C) 36 inches
• D) 48 inches
Answer: B (Note: IRC M1305.1 specifies 30 inches)
11. Where an appliance is installed in an attic, the clear access
opening must be a minimum of:
• A) 20 inches x 30 inches
• B) 22 inches x 30 inches
• C) 30 inches x 30 inches
• D) 36 inches x 36 inches
Answer: B (Based on IRC M1305.1.3)
12. For an appliance with an ignition source located in a garage, the
source of ignition shall be a minimum of ____ above the garage
floor.
• A) 12 inches
• B) 18 inches
• C) 36 inches
, • D) 48 inches
Answer: B (Based on IRC M1307.3)
13. According to the IMC, a mechanical permit typically becomes
invalid if work is not commenced within how many days of issue?
• A) 90 days
• B) 120 days
• C) 180 days
• D) 365 days
Answer: C
• 14. ASHRAE Standard 180 primarily helps facility managers:
A) Design new HVAC systems
B) Establish maintenance schedules and procedures
C) Eliminate HVAC systems
D) Replace building codes
Rationale: ASHRAE Standard 180 provides guidelines for establishing
HVAC inspection and maintenance procedures to ensure system
performance and longevity.
• 15. The most common refrigerant used in existing modern
residential or light commercial air conditioning systems is:
A) R-12
B) R-22
C) R-134a
D) R-410A
Rationale: R-410A is the standard refrigerant for new residential and
light commercial systems. R-22 is being phased out, and R-12 is
obsolete.
• 16. Refrigerant 410 has special characteristics including higher
operating pressure, a small temperature glide and is:
A) an azeotrope
B) a near azeotrope
C) a zoetrope
D) a CFC
Rationale: R-410A is a near-azeotropic blend, meaning its
