1|Page
Engineering Contractor (Class A) Exam Prep |
Latest 2026 Update | Questions & Answers PDF
1. A contractor discovers an unmarked underground utility line while excavating.
What is the proper procedure to follow?
A) Continue digging carefully around the line
B) Cover it back up and dig in a different location
C) Stop work immediately and contact the utility company
D) Mark it yourself and proceed with caution
✓ Correct Answer: C) Stop work immediately and contact the utility company
✓ When an unmarked utility line is discovered during excavation, all work
must stop and the utility company must be contacted to identify and mark
the line properly before any further digging occurs.
2. What is the minimum distance that mechanical excavating equipment must
maintain from painted utility markings on the ground?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
✓ Correct Answer: C) 24 inches
✓ California law requires that mechanical excavating equipment maintain a
minimum distance of 24 inches from painted utility markings to prevent
accidental damage to underground utilities.
3. Which of the following best describes TypeB soil according to OSHA
classifications?
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
,2|Page
A) Cohesive soil with compressive strength over 1.5 tsf
B) Unstable dry rock, angular gravel, sandy loam, and cohesive soils with
compressive strengths between 0.5 and 1.5 tsf
C) Granular soils with compressive strength under 0.5 tsf
D) Stable rock and hardpan materials
✓ Correct Answer: B) Unstable dry rock, angular gravel, sandy loam, and
cohesive soils with compressive strengths between 0.5 and 1.5 tsf
✓ TypeB soil includes unstable dry rock, angular gravel, sandy loam, and
cohesive soils with compressive strengths ranging from 0.5 to 1.5 tons per
square foot, making it moderately stable but requiring proper sloping or
shoring.
4. What is the maximum simple slope permitted for an excavation up to 20 feet
deep in TypeB soil?
A) 1:1 (45 degrees)
B) 1:1.5 (34 degrees)
C) 1:2 (26.5 degrees)
D) 1:0.75 (53 degrees)
✓ Correct Answer: A) 1:1 (45 degrees)
✓ For safety reasons, TypeB soil excavations up to 20 feet deep require a
maximum slope of 1:1, which equals 45 degrees, to prevent caveins and
protect workers.
5. When working on rolling scaffolding, which of the following safety
requirements must be met?
A) A locking system is required for each wheel
B) The scaffold must support four times the designed weight limit
C) Scaffold wheels must be locked when in position
D) All of the above
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
,3|Page
✓ Correct Answer: D) All of the above
✓ Rolling scaffolding requires each wheel to have a locking system, must
support four times the designed weight limit, and wheels must be locked
when in position to ensure worker safety and stability.
6. What is the minimum time that must pass before caulking or grouting newly
installed tiles?
A) 12 hours
B) 2448 hours
C) 72 hours
D) 1 week
✓ Correct Answer: B) 2448 hours
✓ Newly installed tiles require 24 to 48 hours of curing time before caulking
or grouting to ensure proper setting and adhesion of the tile to the
substrate.
7. How long should you wait before installing tile on a newly constructed shower
pan?
A) 12 hours
B) 24 hours
C) 48 hours
D) 72 hours
✓ Correct Answer: B) 24 hours
✓ The shower pan must be allowed to cure for a minimum of 24 hours
before tile installation to ensure the pan has properly set and will support
the tile installation.
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
, 4|Page
8. When unused mortar stiffens due to the hydration of cement, what must be done
with it?
A) Add more water and remix
B) Add a plasticizer and reuse
C) Discard the mortar
D) Use it for nonstructural work
✓ Correct Answer: C) Discard the mortar
✓ Once mortar has begun to stiffen due to cement hydration, it cannot be
retempered with water and must be discarded as its structural integrity and
bonding properties have been compromised.
9. A Pittsburgh joint is commonly used in which construction application?
A) Plumbing connections
B) HVAC ductwork
C) Electrical conduit
D) Roofing flashing
✓ Correct Answer: B) HVAC ductwork
✓ The Pittsburgh joint is a specific type of seam used in HVAC ductwork
fabrication that creates a strong, airtight connection between duct sections
using a folded and locked seam.
10. What is the minimum slope required for a shower pan toward the drain?
A) 1/8 inch per foot (1%)
B) 1/4 inch per foot (2%)
C) 1/2 inch per foot (4%)
D) 3/4 inch per foot (6%)
✓ Correct Answer: B) 1/4 inch per foot (2%)
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
Engineering Contractor (Class A) Exam Prep |
Latest 2026 Update | Questions & Answers PDF
1. A contractor discovers an unmarked underground utility line while excavating.
What is the proper procedure to follow?
A) Continue digging carefully around the line
B) Cover it back up and dig in a different location
C) Stop work immediately and contact the utility company
D) Mark it yourself and proceed with caution
✓ Correct Answer: C) Stop work immediately and contact the utility company
✓ When an unmarked utility line is discovered during excavation, all work
must stop and the utility company must be contacted to identify and mark
the line properly before any further digging occurs.
2. What is the minimum distance that mechanical excavating equipment must
maintain from painted utility markings on the ground?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
✓ Correct Answer: C) 24 inches
✓ California law requires that mechanical excavating equipment maintain a
minimum distance of 24 inches from painted utility markings to prevent
accidental damage to underground utilities.
3. Which of the following best describes TypeB soil according to OSHA
classifications?
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
,2|Page
A) Cohesive soil with compressive strength over 1.5 tsf
B) Unstable dry rock, angular gravel, sandy loam, and cohesive soils with
compressive strengths between 0.5 and 1.5 tsf
C) Granular soils with compressive strength under 0.5 tsf
D) Stable rock and hardpan materials
✓ Correct Answer: B) Unstable dry rock, angular gravel, sandy loam, and
cohesive soils with compressive strengths between 0.5 and 1.5 tsf
✓ TypeB soil includes unstable dry rock, angular gravel, sandy loam, and
cohesive soils with compressive strengths ranging from 0.5 to 1.5 tons per
square foot, making it moderately stable but requiring proper sloping or
shoring.
4. What is the maximum simple slope permitted for an excavation up to 20 feet
deep in TypeB soil?
A) 1:1 (45 degrees)
B) 1:1.5 (34 degrees)
C) 1:2 (26.5 degrees)
D) 1:0.75 (53 degrees)
✓ Correct Answer: A) 1:1 (45 degrees)
✓ For safety reasons, TypeB soil excavations up to 20 feet deep require a
maximum slope of 1:1, which equals 45 degrees, to prevent caveins and
protect workers.
5. When working on rolling scaffolding, which of the following safety
requirements must be met?
A) A locking system is required for each wheel
B) The scaffold must support four times the designed weight limit
C) Scaffold wheels must be locked when in position
D) All of the above
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
,3|Page
✓ Correct Answer: D) All of the above
✓ Rolling scaffolding requires each wheel to have a locking system, must
support four times the designed weight limit, and wheels must be locked
when in position to ensure worker safety and stability.
6. What is the minimum time that must pass before caulking or grouting newly
installed tiles?
A) 12 hours
B) 2448 hours
C) 72 hours
D) 1 week
✓ Correct Answer: B) 2448 hours
✓ Newly installed tiles require 24 to 48 hours of curing time before caulking
or grouting to ensure proper setting and adhesion of the tile to the
substrate.
7. How long should you wait before installing tile on a newly constructed shower
pan?
A) 12 hours
B) 24 hours
C) 48 hours
D) 72 hours
✓ Correct Answer: B) 24 hours
✓ The shower pan must be allowed to cure for a minimum of 24 hours
before tile installation to ensure the pan has properly set and will support
the tile installation.
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
, 4|Page
8. When unused mortar stiffens due to the hydration of cement, what must be done
with it?
A) Add more water and remix
B) Add a plasticizer and reuse
C) Discard the mortar
D) Use it for nonstructural work
✓ Correct Answer: C) Discard the mortar
✓ Once mortar has begun to stiffen due to cement hydration, it cannot be
retempered with water and must be discarded as its structural integrity and
bonding properties have been compromised.
9. A Pittsburgh joint is commonly used in which construction application?
A) Plumbing connections
B) HVAC ductwork
C) Electrical conduit
D) Roofing flashing
✓ Correct Answer: B) HVAC ductwork
✓ The Pittsburgh joint is a specific type of seam used in HVAC ductwork
fabrication that creates a strong, airtight connection between duct sections
using a folded and locked seam.
10. What is the minimum slope required for a shower pan toward the drain?
A) 1/8 inch per foot (1%)
B) 1/4 inch per foot (2%)
C) 1/2 inch per foot (4%)
D) 3/4 inch per foot (6%)
✓ Correct Answer: B) 1/4 inch per foot (2%)
ENGINEERING EXAM ✓ @SMARTDOCTOR007 .
