Arkansas AR-SH Sheet Metal
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales |
Complete Contractor License
Exam Prep Study Guide |
Updated 2026
1. Which material is commonly used for HVAC ductwork
because of its strength, durability, and resistance to
corrosion?
A. Galvanized steel
B. Untreated wood
C. Gypsum board
D. Cast iron
Answer: Galvanized steel
Rationale: Galvanized steel is widely used for sheet-
metal ductwork because the zinc coating provides
corrosion resistance while the steel provides strength
and rigidity.
2. What is the primary purpose of a duct system in an HVAC
installation?
A. Store refrigerant
B. Transport conditioned air
C. Generate electricity
D. Support plumbing fixtures
Answer: Transport conditioned air
,Rationale: Ductwork distributes supply air to
conditioned spaces and returns or exhausts air as
required by the HVAC system.
3. Which tool is specifically designed to cut sheet metal
along a straight line?
A. Pipe wrench
B. Tubing cutter
C. Aviation snips
D. Chain wrench
Answer: Aviation snips
Rationale: Aviation snips are designed for cutting sheet
metal and are available in configurations for straight,
left, and right cuts.
4. What is the purpose of a Pittsburgh lock seam?
A. To join electrical conduit
B. To mechanically join sheet-metal duct sections
C. To seal concrete joints
D. To connect copper water pipe
Answer: To mechanically join sheet-metal duct sections
Rationale: A Pittsburgh lock is a common longitudinal
seam used in rectangular sheet-metal duct fabrication.
5. What is the primary purpose of duct insulation?
A. Increase air leakage
B. Reduce heat transfer and condensation
C. Increase duct weight
D. Eliminate the need for duct supports
Answer: Reduce heat transfer and condensation
Rationale: Insulation limits unwanted heat gain or loss
and helps prevent condensation on cold duct surfaces.
6. What does a duct turning vane primarily do?
,A. Increase electrical voltage
B. Improve airflow through an elbow
C. Reduce refrigerant pressure
D. Support a roof curb
Answer: Improve airflow through an elbow
Rationale: Turning vanes guide air through elbows,
reducing turbulence, pressure loss, and uneven airflow.
7. What is the purpose of a duct sealant?
A. Lubricate bearings
B. Reduce air leakage at duct joints and seams
C. Strengthen concrete
D. Remove rust
Answer: Reduce air leakage at duct joints and seams
Rationale: Approved duct sealants are used to close
gaps and improve the airtightness of duct systems.
8. What does HVAC stand for?
A. Heat Valve Air Control
B. Heating, Ventilation, and Air Conditioning
C. High Voltage Air Circulation
D. Heating Vacuum and Cooling
Answer: Heating, Ventilation, and Air Conditioning
Rationale: HVAC describes systems used to heat,
ventilate, condition, and distribute air within buildings.
9. Which component is normally used to control the volume
of airflow through a duct?
A. Thermostat wire
B. Damper
C. Expansion tank
D. Trap primer
Answer: Damper
, Rationale: Dampers regulate or shut off airflow in ducts
and may be manually or automatically controlled.
10. What is the main purpose of a fire damper?
A. Increase supply-air temperature
B. Limit the spread of fire through a duct opening
C. Increase refrigerant flow
D. Prevent water hammer
Answer: Limit the spread of fire through a duct opening
Rationale: Fire dampers are designed to close when
exposed to elevated temperatures and help maintain
the fire-resistance rating of assemblies.
11. What is a smoke damper designed primarily to
control?
A. Condensation
B. Refrigerant
C. Smoke movement
D. Plumbing pressure
Answer: Smoke movement
Rationale: Smoke dampers limit the movement of smoke
through HVAC systems and are commonly integrated
with building fire and smoke-control systems.
12. Which instrument is commonly used to measure
static pressure in ductwork?
A. Thermocouple
B. Manometer
C. Megohmmeter
D. Tachometer
Answer: Manometer
Rationale: A manometer measures pressure differences
and is commonly used for duct static-pressure testing.
13. What is the purpose of a flexible duct connector?
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales |
Complete Contractor License
Exam Prep Study Guide |
Updated 2026
1. Which material is commonly used for HVAC ductwork
because of its strength, durability, and resistance to
corrosion?
A. Galvanized steel
B. Untreated wood
C. Gypsum board
D. Cast iron
Answer: Galvanized steel
Rationale: Galvanized steel is widely used for sheet-
metal ductwork because the zinc coating provides
corrosion resistance while the steel provides strength
and rigidity.
2. What is the primary purpose of a duct system in an HVAC
installation?
A. Store refrigerant
B. Transport conditioned air
C. Generate electricity
D. Support plumbing fixtures
Answer: Transport conditioned air
,Rationale: Ductwork distributes supply air to
conditioned spaces and returns or exhausts air as
required by the HVAC system.
3. Which tool is specifically designed to cut sheet metal
along a straight line?
A. Pipe wrench
B. Tubing cutter
C. Aviation snips
D. Chain wrench
Answer: Aviation snips
Rationale: Aviation snips are designed for cutting sheet
metal and are available in configurations for straight,
left, and right cuts.
4. What is the purpose of a Pittsburgh lock seam?
A. To join electrical conduit
B. To mechanically join sheet-metal duct sections
C. To seal concrete joints
D. To connect copper water pipe
Answer: To mechanically join sheet-metal duct sections
Rationale: A Pittsburgh lock is a common longitudinal
seam used in rectangular sheet-metal duct fabrication.
5. What is the primary purpose of duct insulation?
A. Increase air leakage
B. Reduce heat transfer and condensation
C. Increase duct weight
D. Eliminate the need for duct supports
Answer: Reduce heat transfer and condensation
Rationale: Insulation limits unwanted heat gain or loss
and helps prevent condensation on cold duct surfaces.
6. What does a duct turning vane primarily do?
,A. Increase electrical voltage
B. Improve airflow through an elbow
C. Reduce refrigerant pressure
D. Support a roof curb
Answer: Improve airflow through an elbow
Rationale: Turning vanes guide air through elbows,
reducing turbulence, pressure loss, and uneven airflow.
7. What is the purpose of a duct sealant?
A. Lubricate bearings
B. Reduce air leakage at duct joints and seams
C. Strengthen concrete
D. Remove rust
Answer: Reduce air leakage at duct joints and seams
Rationale: Approved duct sealants are used to close
gaps and improve the airtightness of duct systems.
8. What does HVAC stand for?
A. Heat Valve Air Control
B. Heating, Ventilation, and Air Conditioning
C. High Voltage Air Circulation
D. Heating Vacuum and Cooling
Answer: Heating, Ventilation, and Air Conditioning
Rationale: HVAC describes systems used to heat,
ventilate, condition, and distribute air within buildings.
9. Which component is normally used to control the volume
of airflow through a duct?
A. Thermostat wire
B. Damper
C. Expansion tank
D. Trap primer
Answer: Damper
, Rationale: Dampers regulate or shut off airflow in ducts
and may be manually or automatically controlled.
10. What is the main purpose of a fire damper?
A. Increase supply-air temperature
B. Limit the spread of fire through a duct opening
C. Increase refrigerant flow
D. Prevent water hammer
Answer: Limit the spread of fire through a duct opening
Rationale: Fire dampers are designed to close when
exposed to elevated temperatures and help maintain
the fire-resistance rating of assemblies.
11. What is a smoke damper designed primarily to
control?
A. Condensation
B. Refrigerant
C. Smoke movement
D. Plumbing pressure
Answer: Smoke movement
Rationale: Smoke dampers limit the movement of smoke
through HVAC systems and are commonly integrated
with building fire and smoke-control systems.
12. Which instrument is commonly used to measure
static pressure in ductwork?
A. Thermocouple
B. Manometer
C. Megohmmeter
D. Tachometer
Answer: Manometer
Rationale: A manometer measures pressure differences
and is commonly used for duct static-pressure testing.
13. What is the purpose of a flexible duct connector?
