CT Sheet Metal Contractor Exam – State
Of Connecticut Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which tool is primarily used to measure air velocity in duct systems?
A. Manometer
B. Anemometer
C. Hygrometer
D. Tachometer
Answer: B. Anemometer
A mechanical or digital anemometer is specifically designed to measure air
velocity in HVAC and sheet metal duct systems. Manometers measure pressure,
hygrometers measure humidity, and tachometers measure rotational speed,
making them unsuitable for airflow measurement. Accurate air velocity
measurement is critical for balancing HVAC systems and ensuring proper
ventilation performance in Connecticut commercial and residential installations.
Question 2
What is the primary purpose of duct insulation?
A. Increase air velocity
B. Reduce heat loss or gain
C. Increase duct strength
,D. Prevent static pressure
Answer: B. Reduce heat loss or gain
Duct insulation is used primarily to minimize thermal energy transfer between
conditioned air inside the duct and surrounding ambient air. This improves
system efficiency, reduces energy consumption, and prevents condensation
issues. While insulation may provide some noise reduction, its main function is
thermal control rather than structural reinforcement or airflow modification.
Question 3
Which metal is most commonly used in HVAC ductwork due to corrosion
resistance?
A. Copper
B. Aluminum
C. Galvanized steel
D. Cast iron
Answer: C. Galvanized steel
Galvanized steel is widely used in sheet metal duct construction because the zinc
coating protects against corrosion, extends service life, and provides structural
strength at a reasonable cost. Aluminum is also used in specific applications, but
galvanized steel remains the industry standard for most HVAC duct systems in
Connecticut construction codes.
Question 4
What does “CFM” stand for in HVAC systems?
A. Cubic Flow Measurement
B. Controlled Fluid Motion
C. Cubic Feet per Minute
D. Current Flow Meter
Answer: C. Cubic Feet per Minute
CFM is a standard measurement of airflow volume indicating how many cubic
,feet of air pass a point in one minute. It is essential for HVAC design, duct sizing,
and system balancing. Proper CFM calculation ensures that heating and cooling
loads are met efficiently in residential and commercial environments.
Question 5
Which device measures static air pressure in ducts?
A. Thermometer
B. Manometer
C. Psychrometer
D. Barometer
Answer: B. Manometer
A manometer is used to measure static pressure within duct systems, helping
technicians evaluate airflow resistance and system performance. Thermometers
measure temperature, psychrometers measure humidity, and barometers
measure atmospheric pressure, not internal duct pressure.
Question 6
Which joint is commonly used for connecting round duct sections?
A. Pittsburgh seam
B. Standing seam
C. Slip and drive joint
D. Snap-lock joint
Answer: D. Snap-lock joint
Snap-lock joints are commonly used in round duct fabrication because they
allow quick assembly, provide adequate sealing, and reduce labor time.
Pittsburgh seams and standing seams are more commonly used in rectangular
duct fabrication and roofing applications respectively.
Question 7
, What is the primary purpose of a duct takeoff fitting?
A. Increase air pressure
B. Branch airflow from main duct
C. Reduce duct noise
D. Seal duct joints
Answer: B. Branch airflow from main duct
A takeoff fitting is used to divert airflow from a main duct line into a branch duct
system. This is essential for distributing conditioned air to different zones within
a building. It does not primarily control noise, sealing, or pressure
independently.
Question 8
Which safety equipment is mandatory when cutting sheet metal?
A. Safety goggles
B. Welding mask
C. Steel boots only
D. Respirator only
Answer: A. Safety goggles
Safety goggles protect the eyes from sharp metal fragments, sparks, and debris
generated during cutting or fabrication. While other PPE such as gloves and
hearing protection may also be required, eye protection is critical and
mandatory under OSHA safety standards for sheet metal work.
Question 9
What is the purpose of a turning vane in ductwork?
A. Increase duct weight
B. Reduce airflow turbulence
C. Measure airflow
D. Seal duct leaks
Answer: B. Reduce airflow turbulence
Of Connecticut Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which tool is primarily used to measure air velocity in duct systems?
A. Manometer
B. Anemometer
C. Hygrometer
D. Tachometer
Answer: B. Anemometer
A mechanical or digital anemometer is specifically designed to measure air
velocity in HVAC and sheet metal duct systems. Manometers measure pressure,
hygrometers measure humidity, and tachometers measure rotational speed,
making them unsuitable for airflow measurement. Accurate air velocity
measurement is critical for balancing HVAC systems and ensuring proper
ventilation performance in Connecticut commercial and residential installations.
Question 2
What is the primary purpose of duct insulation?
A. Increase air velocity
B. Reduce heat loss or gain
C. Increase duct strength
,D. Prevent static pressure
Answer: B. Reduce heat loss or gain
Duct insulation is used primarily to minimize thermal energy transfer between
conditioned air inside the duct and surrounding ambient air. This improves
system efficiency, reduces energy consumption, and prevents condensation
issues. While insulation may provide some noise reduction, its main function is
thermal control rather than structural reinforcement or airflow modification.
Question 3
Which metal is most commonly used in HVAC ductwork due to corrosion
resistance?
A. Copper
B. Aluminum
C. Galvanized steel
D. Cast iron
Answer: C. Galvanized steel
Galvanized steel is widely used in sheet metal duct construction because the zinc
coating protects against corrosion, extends service life, and provides structural
strength at a reasonable cost. Aluminum is also used in specific applications, but
galvanized steel remains the industry standard for most HVAC duct systems in
Connecticut construction codes.
Question 4
What does “CFM” stand for in HVAC systems?
A. Cubic Flow Measurement
B. Controlled Fluid Motion
C. Cubic Feet per Minute
D. Current Flow Meter
Answer: C. Cubic Feet per Minute
CFM is a standard measurement of airflow volume indicating how many cubic
,feet of air pass a point in one minute. It is essential for HVAC design, duct sizing,
and system balancing. Proper CFM calculation ensures that heating and cooling
loads are met efficiently in residential and commercial environments.
Question 5
Which device measures static air pressure in ducts?
A. Thermometer
B. Manometer
C. Psychrometer
D. Barometer
Answer: B. Manometer
A manometer is used to measure static pressure within duct systems, helping
technicians evaluate airflow resistance and system performance. Thermometers
measure temperature, psychrometers measure humidity, and barometers
measure atmospheric pressure, not internal duct pressure.
Question 6
Which joint is commonly used for connecting round duct sections?
A. Pittsburgh seam
B. Standing seam
C. Slip and drive joint
D. Snap-lock joint
Answer: D. Snap-lock joint
Snap-lock joints are commonly used in round duct fabrication because they
allow quick assembly, provide adequate sealing, and reduce labor time.
Pittsburgh seams and standing seams are more commonly used in rectangular
duct fabrication and roofing applications respectively.
Question 7
, What is the primary purpose of a duct takeoff fitting?
A. Increase air pressure
B. Branch airflow from main duct
C. Reduce duct noise
D. Seal duct joints
Answer: B. Branch airflow from main duct
A takeoff fitting is used to divert airflow from a main duct line into a branch duct
system. This is essential for distributing conditioned air to different zones within
a building. It does not primarily control noise, sealing, or pressure
independently.
Question 8
Which safety equipment is mandatory when cutting sheet metal?
A. Safety goggles
B. Welding mask
C. Steel boots only
D. Respirator only
Answer: A. Safety goggles
Safety goggles protect the eyes from sharp metal fragments, sparks, and debris
generated during cutting or fabrication. While other PPE such as gloves and
hearing protection may also be required, eye protection is critical and
mandatory under OSHA safety standards for sheet metal work.
Question 9
What is the purpose of a turning vane in ductwork?
A. Increase duct weight
B. Reduce airflow turbulence
C. Measure airflow
D. Seal duct leaks
Answer: B. Reduce airflow turbulence
