NASSCO Manhole Assessment Certification
Program (MACP) Exam Questions and Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
Instructions: Questions 1–50 are multiple choice. Select the best
answer.
1. The primary purpose of the MACP is to standardize the inspection
and assessment of:
A. Gravity sewers
B. Laterals
C. Manholes
D. Pump stations
Answer: C
The MACP focuses specifically on consistent inspection and coding of
manhole conditions.
2. In MACP, which component refers to the vertical interior surface
of a manhole?
A. Bench
B. Invert
C. Chimney
D. Barrel
Answer: D
The barrel is the vertical wall section between the cone and the bench.
3. Which material is most commonly used for precast manholes?
A. PVC
, B. Concrete
C. Clay
D. Ductile iron
Answer: B
Precast concrete is the most widely used material for manhole
construction.
4. The cone section of a manhole primarily functions to:
A. Direct flow
B. Support the cover
C. Transition from barrel to frame
D. Prevent infiltration
Answer: C
The cone reduces the opening size and connects the barrel to the frame
and cover.
5. Which defect category includes cracks, fractures, and broken
components?
A. O&M defects
B. Structural defects
C. Construction features
D. Service conditions
Answer: B
Structural defects affect the integrity of the manhole.
6. Active groundwater entering a manhole is coded as:
A. Dampness
B. Staining
C. Infiltration
D. Efflorescence
, Answer: C
Infiltration is active water entering from outside the structure.
7. Which MACP rating indicates the most severe condition?
A. Grade 1
B. Grade 2
C. Grade 3
D. Grade 5
Answer: D
Grade 5 represents conditions requiring immediate attention.
8. The bench of a manhole is best described as:
A. The access opening
B. The sloped surface directing flow
C. The vertical wall
D. The frame support
Answer: B
The bench slopes toward the channel to direct wastewater flow.
9. Which condition most directly increases the risk of inflow?
A. Cracked barrel
B. Missing or damaged cover
C. Efflorescence
D. Coating failure
Answer: B
Surface water can enter through an open or damaged cover.
10. Efflorescence on a manhole surface usually indicates:
A. Structural collapse
B. Past moisture movement
C. Chemical attack
D. Active infiltration
Program (MACP) Exam Questions and Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
Instructions: Questions 1–50 are multiple choice. Select the best
answer.
1. The primary purpose of the MACP is to standardize the inspection
and assessment of:
A. Gravity sewers
B. Laterals
C. Manholes
D. Pump stations
Answer: C
The MACP focuses specifically on consistent inspection and coding of
manhole conditions.
2. In MACP, which component refers to the vertical interior surface
of a manhole?
A. Bench
B. Invert
C. Chimney
D. Barrel
Answer: D
The barrel is the vertical wall section between the cone and the bench.
3. Which material is most commonly used for precast manholes?
A. PVC
, B. Concrete
C. Clay
D. Ductile iron
Answer: B
Precast concrete is the most widely used material for manhole
construction.
4. The cone section of a manhole primarily functions to:
A. Direct flow
B. Support the cover
C. Transition from barrel to frame
D. Prevent infiltration
Answer: C
The cone reduces the opening size and connects the barrel to the frame
and cover.
5. Which defect category includes cracks, fractures, and broken
components?
A. O&M defects
B. Structural defects
C. Construction features
D. Service conditions
Answer: B
Structural defects affect the integrity of the manhole.
6. Active groundwater entering a manhole is coded as:
A. Dampness
B. Staining
C. Infiltration
D. Efflorescence
, Answer: C
Infiltration is active water entering from outside the structure.
7. Which MACP rating indicates the most severe condition?
A. Grade 1
B. Grade 2
C. Grade 3
D. Grade 5
Answer: D
Grade 5 represents conditions requiring immediate attention.
8. The bench of a manhole is best described as:
A. The access opening
B. The sloped surface directing flow
C. The vertical wall
D. The frame support
Answer: B
The bench slopes toward the channel to direct wastewater flow.
9. Which condition most directly increases the risk of inflow?
A. Cracked barrel
B. Missing or damaged cover
C. Efflorescence
D. Coating failure
Answer: B
Surface water can enter through an open or damaged cover.
10. Efflorescence on a manhole surface usually indicates:
A. Structural collapse
B. Past moisture movement
C. Chemical attack
D. Active infiltration
