AK Core Drilling Contractor Exam Questions
and Correct Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download Pdf
1. What is the primary purpose of core drilling in concrete?
A. To polish the concrete surface
B. To create a precise cylindrical opening through concrete
C. To remove surface paint
D. To increase concrete strength
Answer: B. To create a precise cylindrical opening through concrete
Rationale: Core drilling uses a diamond-embedded cylindrical bit to
cut a circular section through concrete, masonry, or similar materials.
The resulting opening is commonly used for utilities, anchors, pipes,
conduits, and testing.
2. Which cutting technology is most commonly used for professional
concrete core drilling?
,A. Abrasive sandpaper
B. Carbide saw blades
C. Diamond tooling
D. Wood-cutting blades
Answer: C. Diamond tooling
Rationale: Diamond segments provide the hardness and wear
resistance needed to cut concrete and aggregate efficiently.
Professional core drills use diamond core bits selected according to the
material and drilling conditions.
3. Before drilling into an existing concrete slab, what should be done
first?
A. Increase drilling speed
B. Verify the location of embedded utilities and reinforcement
C. Remove all reinforcement
D. Apply paint to the drilling area
Answer: B. Verify the location of embedded utilities and
reinforcement
Rationale: Concrete may contain electrical conduits, post-tensioning
tendons, reinforcing steel, plumbing, or other embedded systems.
,Locating these hazards before drilling helps prevent structural
damage, utility strikes, injuries, and costly repairs.
4. What is the function of a core drill stand or rig?
A. To heat the concrete
B. To stabilize and guide the drilling equipment
C. To sharpen reinforcement bars
D. To collect dust from sanding
Answer: B. To stabilize and guide the drilling equipment
Rationale: A drill rig or stand provides controlled movement and
alignment of the core drill. It helps maintain a straight hole, reduces
operator fatigue, and improves accuracy, especially for larger-
diameter cores.
5. What is a common method for securing a core-drilling rig to
concrete?
A. Adhesive tape only
B. Mechanical anchoring
C. Loose placement on the slab
D. Plastic straps only
, Answer: B. Mechanical anchoring
Rationale: Mechanical anchors can secure the rig firmly to the
concrete surface. Proper anchoring prevents movement or rotation of
the equipment during drilling and is particularly important for large or
deep cores.
6. What is the primary purpose of water during wet core drilling?
A. To increase concrete strength
B. To cool the diamond bit and control drilling dust
C. To make the bit heavier
D. To eliminate the need for PPE
Answer: B. To cool the diamond bit and control drilling dust
Rationale: Water carries heat away from the diamond segments and
helps prevent overheating. It also suppresses airborne respirable silica
dust generated during concrete cutting.
7. What is a major hazard associated with dry drilling concrete?
A. Excessive wood grain
B. Respirable crystalline silica exposure
and Correct Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download Pdf
1. What is the primary purpose of core drilling in concrete?
A. To polish the concrete surface
B. To create a precise cylindrical opening through concrete
C. To remove surface paint
D. To increase concrete strength
Answer: B. To create a precise cylindrical opening through concrete
Rationale: Core drilling uses a diamond-embedded cylindrical bit to
cut a circular section through concrete, masonry, or similar materials.
The resulting opening is commonly used for utilities, anchors, pipes,
conduits, and testing.
2. Which cutting technology is most commonly used for professional
concrete core drilling?
,A. Abrasive sandpaper
B. Carbide saw blades
C. Diamond tooling
D. Wood-cutting blades
Answer: C. Diamond tooling
Rationale: Diamond segments provide the hardness and wear
resistance needed to cut concrete and aggregate efficiently.
Professional core drills use diamond core bits selected according to the
material and drilling conditions.
3. Before drilling into an existing concrete slab, what should be done
first?
A. Increase drilling speed
B. Verify the location of embedded utilities and reinforcement
C. Remove all reinforcement
D. Apply paint to the drilling area
Answer: B. Verify the location of embedded utilities and
reinforcement
Rationale: Concrete may contain electrical conduits, post-tensioning
tendons, reinforcing steel, plumbing, or other embedded systems.
,Locating these hazards before drilling helps prevent structural
damage, utility strikes, injuries, and costly repairs.
4. What is the function of a core drill stand or rig?
A. To heat the concrete
B. To stabilize and guide the drilling equipment
C. To sharpen reinforcement bars
D. To collect dust from sanding
Answer: B. To stabilize and guide the drilling equipment
Rationale: A drill rig or stand provides controlled movement and
alignment of the core drill. It helps maintain a straight hole, reduces
operator fatigue, and improves accuracy, especially for larger-
diameter cores.
5. What is a common method for securing a core-drilling rig to
concrete?
A. Adhesive tape only
B. Mechanical anchoring
C. Loose placement on the slab
D. Plastic straps only
, Answer: B. Mechanical anchoring
Rationale: Mechanical anchors can secure the rig firmly to the
concrete surface. Proper anchoring prevents movement or rotation of
the equipment during drilling and is particularly important for large or
deep cores.
6. What is the primary purpose of water during wet core drilling?
A. To increase concrete strength
B. To cool the diamond bit and control drilling dust
C. To make the bit heavier
D. To eliminate the need for PPE
Answer: B. To cool the diamond bit and control drilling dust
Rationale: Water carries heat away from the diamond segments and
helps prevent overheating. It also suppresses airborne respirable silica
dust generated during concrete cutting.
7. What is a major hazard associated with dry drilling concrete?
A. Excessive wood grain
B. Respirable crystalline silica exposure
