NYC Health Hospitals Sheet Metal
Worker Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. During the installation of a new galvanized steel rectangular supply
duct system in a patient care wing of a hospital, a Sheet Metal Worker
notices that several duct sections have been dented during delivery.
According to accepted trade practice and quality installation standards,
what is the BEST course of action before the system is installed?
A. Install the damaged sections because insulation will conceal the dents.
B. Straighten severely damaged sections with a hammer after installation.
C. Inspect the damage, repair or replace sections that could affect
structural integrity, airflow, or appearance before installation.
D. Ignore cosmetic defects because airflow is unaffected.
,Rationale: Damaged duct sections may reduce airflow efficiency, create
leakage points, or fail inspection. Proper inspection and repair or
replacement before installation ensures compliance with specifications and
quality standards.
2. Which measuring tool provides the GREATEST accuracy when laying
out precise dimensions for fabrication of HVAC duct fittings?
A. Folding carpenter's rule
B. Steel tape measure with clearly graduated markings
C. Chalk line
D. Wooden yardstick
Rationale: A quality steel tape provides accurate measurements over
varying distances, resists stretching, and is the standard measuring tool for
fabrication work.
3. A Sheet Metal Worker must determine the developed length of a
cylindrical duct section before cutting the sheet metal. Which formula
should be used?
A. Diameter × 2
B. Radius × π
C. Diameter × 4
D. Circumference = π × Diameter
Rationale: The developed length of a round duct equals its circumference,
which is calculated by multiplying the diameter by π.
, 4. When using powered sheet metal shears, the PRIMARY safety concern
is to:
A. Operate them without gloves for better grip.
B. Hold the material with both hands directly ahead of the blade.
C. Keep hands clear of the cutting path while securing the workpiece
properly.
D. Increase cutting speed whenever possible.
Rationale: Powered shears create severe cutting hazards. Maintaining
proper hand placement and securing the workpiece minimizes injury risk.
5. Why are turning vanes installed inside square or rectangular duct
elbows?
A. To reduce duct weight
B. To strengthen duct seams
C. To reduce turbulence and improve airflow efficiency
D. To increase static pressure intentionally
Rationale: Turning vanes guide airflow smoothly around elbows, reducing
turbulence, pressure loss, and noise.
6. Which material is MOST commonly used for general commercial HVAC
ductwork because of its corrosion resistance and ease of fabrication?
A. Copper
B. Aluminum bronze
, C. Galvanized steel
D. Cast iron
Rationale: Galvanized steel combines strength, corrosion resistance,
affordability, and ease of fabrication, making it the standard material for
HVAC ducts.
7. Lockout/tagout procedures should be performed BEFORE servicing
powered sheet metal fabrication equipment because they:
A. Reduce production delays.
B. Improve tool lubrication.
C. Prevent unexpected startup that could seriously injure workers.
D. Eliminate all electrical hazards permanently.
Rationale: Lockout/tagout isolates hazardous energy sources and prevents
accidental machine startup during maintenance.
8. Which seam is commonly used for joining longitudinal edges of
rectangular ductwork?
A. Butt weld
B. Lap splice only
C. Pittsburgh lock seam
D. Riveted butt seam exclusively
Rationale: The Pittsburgh lock seam provides a secure, durable longitudinal
joint widely used in rectangular duct fabrication.
Worker Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. During the installation of a new galvanized steel rectangular supply
duct system in a patient care wing of a hospital, a Sheet Metal Worker
notices that several duct sections have been dented during delivery.
According to accepted trade practice and quality installation standards,
what is the BEST course of action before the system is installed?
A. Install the damaged sections because insulation will conceal the dents.
B. Straighten severely damaged sections with a hammer after installation.
C. Inspect the damage, repair or replace sections that could affect
structural integrity, airflow, or appearance before installation.
D. Ignore cosmetic defects because airflow is unaffected.
,Rationale: Damaged duct sections may reduce airflow efficiency, create
leakage points, or fail inspection. Proper inspection and repair or
replacement before installation ensures compliance with specifications and
quality standards.
2. Which measuring tool provides the GREATEST accuracy when laying
out precise dimensions for fabrication of HVAC duct fittings?
A. Folding carpenter's rule
B. Steel tape measure with clearly graduated markings
C. Chalk line
D. Wooden yardstick
Rationale: A quality steel tape provides accurate measurements over
varying distances, resists stretching, and is the standard measuring tool for
fabrication work.
3. A Sheet Metal Worker must determine the developed length of a
cylindrical duct section before cutting the sheet metal. Which formula
should be used?
A. Diameter × 2
B. Radius × π
C. Diameter × 4
D. Circumference = π × Diameter
Rationale: The developed length of a round duct equals its circumference,
which is calculated by multiplying the diameter by π.
, 4. When using powered sheet metal shears, the PRIMARY safety concern
is to:
A. Operate them without gloves for better grip.
B. Hold the material with both hands directly ahead of the blade.
C. Keep hands clear of the cutting path while securing the workpiece
properly.
D. Increase cutting speed whenever possible.
Rationale: Powered shears create severe cutting hazards. Maintaining
proper hand placement and securing the workpiece minimizes injury risk.
5. Why are turning vanes installed inside square or rectangular duct
elbows?
A. To reduce duct weight
B. To strengthen duct seams
C. To reduce turbulence and improve airflow efficiency
D. To increase static pressure intentionally
Rationale: Turning vanes guide airflow smoothly around elbows, reducing
turbulence, pressure loss, and noise.
6. Which material is MOST commonly used for general commercial HVAC
ductwork because of its corrosion resistance and ease of fabrication?
A. Copper
B. Aluminum bronze
, C. Galvanized steel
D. Cast iron
Rationale: Galvanized steel combines strength, corrosion resistance,
affordability, and ease of fabrication, making it the standard material for
HVAC ducts.
7. Lockout/tagout procedures should be performed BEFORE servicing
powered sheet metal fabrication equipment because they:
A. Reduce production delays.
B. Improve tool lubrication.
C. Prevent unexpected startup that could seriously injure workers.
D. Eliminate all electrical hazards permanently.
Rationale: Lockout/tagout isolates hazardous energy sources and prevents
accidental machine startup during maintenance.
8. Which seam is commonly used for joining longitudinal edges of
rectangular ductwork?
A. Butt weld
B. Lap splice only
C. Pittsburgh lock seam
D. Riveted butt seam exclusively
Rationale: The Pittsburgh lock seam provides a secure, durable longitudinal
joint widely used in rectangular duct fabrication.
