CO Glazing Contractor Exam Questions and
Correct Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download
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1. Which type of glass is specifically designed to reduce the
likelihood of injury when broken because it breaks into relatively
small, granular pieces?
A. Annealed glass
B. Wired glass
C. Tempered glass
D. Laminated glass
Rationale: Tempered glass is heat-treated to increase its strength and
alter its breakage pattern. When it fails, it generally breaks into many
small, relatively blunt pieces rather than large sharp shards. This
makes it appropriate for many locations where safety glazing is
required.
, 2. What is the primary purpose of laminated glass?
A. To increase thermal expansion
B. To provide a decorative surface only
C. To hold broken glass together after impact
D. To eliminate all solar heat gain
Rationale: Laminated glass consists of glass layers bonded to an
interlayer. When the glass breaks, the interlayer tends to retain the
fragments, helping reduce the risk of falling or scattered shards. It can
also provide additional acoustic, security, and solar-control benefits.
3. Which material is commonly used as the interlayer in laminated
architectural glass?
A. Gypsum
B. Polyvinyl butyral (PVB)
C. Portland cement
D. Aluminum oxide
Rationale: PVB is a widely used interlayer material for laminated
glass. It bonds glass plies together and helps retain fragments after
breakage. Other interlayer materials are also available for specialized
applications.
4. What is the principal function of a glazing setting block?
,A. To polish the glass edge
B. To seal the exterior frame
C. To support the weight of the glass and maintain proper positioning
D. To increase the thickness of the glass
Rationale: Setting blocks support the glass at designated locations
and transfer its weight to the frame. They also help maintain proper
clearance between the glass and framing materials, reducing the
possibility of edge damage.
5. Which glass type is normally considered the basic, untreated form
of float glass?
A. Tempered glass
B. Laminated glass
C. Annealed glass
D. Heat-strengthened glass
Rationale: Annealed glass is the standard form of glass produced
without additional heat treatment for strengthening. It can be cut and
fabricated relatively easily, but it breaks into larger, sharper shards
than safety glass.
6. Why should glass edges be protected from direct contact with
hard framing materials?
, A. Glass becomes electrically conductive
B. Edge contact can cause damage and increase the likelihood of
breakage
C. It changes the glass color
D. It prevents glass from expanding
Rationale: Glass is particularly vulnerable to edge damage. Contact
with metal, concrete, stone, or other hard materials can create chips
or localized stresses that may eventually lead to cracking or breakage.
7. Which term describes the ability of glass to resist the passage of
heat?
A. Visible transmittance
B. Solar reflectance
C. Thermal resistance
D. Color rendering
Rationale: Thermal resistance describes how strongly a material
resists heat flow. In glazing systems, thermal performance is
influenced by glass type, coatings, insulating spaces, framing, spacers,
and gas fills.
8. What does U-factor measure in a glazing assembly?
Correct Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download
1. Which type of glass is specifically designed to reduce the
likelihood of injury when broken because it breaks into relatively
small, granular pieces?
A. Annealed glass
B. Wired glass
C. Tempered glass
D. Laminated glass
Rationale: Tempered glass is heat-treated to increase its strength and
alter its breakage pattern. When it fails, it generally breaks into many
small, relatively blunt pieces rather than large sharp shards. This
makes it appropriate for many locations where safety glazing is
required.
, 2. What is the primary purpose of laminated glass?
A. To increase thermal expansion
B. To provide a decorative surface only
C. To hold broken glass together after impact
D. To eliminate all solar heat gain
Rationale: Laminated glass consists of glass layers bonded to an
interlayer. When the glass breaks, the interlayer tends to retain the
fragments, helping reduce the risk of falling or scattered shards. It can
also provide additional acoustic, security, and solar-control benefits.
3. Which material is commonly used as the interlayer in laminated
architectural glass?
A. Gypsum
B. Polyvinyl butyral (PVB)
C. Portland cement
D. Aluminum oxide
Rationale: PVB is a widely used interlayer material for laminated
glass. It bonds glass plies together and helps retain fragments after
breakage. Other interlayer materials are also available for specialized
applications.
4. What is the principal function of a glazing setting block?
,A. To polish the glass edge
B. To seal the exterior frame
C. To support the weight of the glass and maintain proper positioning
D. To increase the thickness of the glass
Rationale: Setting blocks support the glass at designated locations
and transfer its weight to the frame. They also help maintain proper
clearance between the glass and framing materials, reducing the
possibility of edge damage.
5. Which glass type is normally considered the basic, untreated form
of float glass?
A. Tempered glass
B. Laminated glass
C. Annealed glass
D. Heat-strengthened glass
Rationale: Annealed glass is the standard form of glass produced
without additional heat treatment for strengthening. It can be cut and
fabricated relatively easily, but it breaks into larger, sharper shards
than safety glass.
6. Why should glass edges be protected from direct contact with
hard framing materials?
, A. Glass becomes electrically conductive
B. Edge contact can cause damage and increase the likelihood of
breakage
C. It changes the glass color
D. It prevents glass from expanding
Rationale: Glass is particularly vulnerable to edge damage. Contact
with metal, concrete, stone, or other hard materials can create chips
or localized stresses that may eventually lead to cracking or breakage.
7. Which term describes the ability of glass to resist the passage of
heat?
A. Visible transmittance
B. Solar reflectance
C. Thermal resistance
D. Color rendering
Rationale: Thermal resistance describes how strongly a material
resists heat flow. In glazing systems, thermal performance is
influenced by glass type, coatings, insulating spaces, framing, spacers,
and gas fills.
8. What does U-factor measure in a glazing assembly?
