NHI EXAM QUESTIONS & ANSWERS
PASSED ALREADY GRADED A+
What is the normal maximum interval for above water routine inspections? - Correct
Answer ✔✔ 24 months
What is the normal maximum interval for underwater routine inspections? - Correct
Answer ✔✔ 60 months
What are the factors that require a shorter interval for routine underwater inspections? -
Correct Answer ✔✔ Age, condition, aggressive environment, channel instability
What should be the scope of a routine underwater inspection? - Correct Answer ✔✔
100% level 1, 10% level 2, scour assessment
What is the NBI and what does it contain? - Correct Answer ✔✔ National Bridge
Inventory, list of bridges
When must multiple culverts be considered as bridges? - Correct Answer ✔✔ When the
out to out dimension of the bridge extends 20 ft.
What are the three categories of loads bridges are subjected to? - Correct Answer ✔✔
Dead load, live load, secondary load
What is the purpose of a foundation seal? - Correct Answer ✔✔ To seal bottom of
cofferdam during construction of substructure
For an in-service bridge, when is the condition of the seal important? - Correct Answer
✔✔ When the substructure element is on a spread footing
List 3 underwater inspection methods. - Correct Answer ✔✔ Wading, diving, advanced
technologies
What dive safety regulations does the NBIS require be followed? - Correct Answer ✔✔
None, only OSHA requires dive regulations
Name four types of underwater inspections - Correct Answer ✔✔ Initial, routine, interim,
damage
What is the purpose of a hazard analysis? - Correct Answer ✔✔ Identify and mitigate
hazards
PASSED ALREADY GRADED A+
What is the normal maximum interval for above water routine inspections? - Correct
Answer ✔✔ 24 months
What is the normal maximum interval for underwater routine inspections? - Correct
Answer ✔✔ 60 months
What are the factors that require a shorter interval for routine underwater inspections? -
Correct Answer ✔✔ Age, condition, aggressive environment, channel instability
What should be the scope of a routine underwater inspection? - Correct Answer ✔✔
100% level 1, 10% level 2, scour assessment
What is the NBI and what does it contain? - Correct Answer ✔✔ National Bridge
Inventory, list of bridges
When must multiple culverts be considered as bridges? - Correct Answer ✔✔ When the
out to out dimension of the bridge extends 20 ft.
What are the three categories of loads bridges are subjected to? - Correct Answer ✔✔
Dead load, live load, secondary load
What is the purpose of a foundation seal? - Correct Answer ✔✔ To seal bottom of
cofferdam during construction of substructure
For an in-service bridge, when is the condition of the seal important? - Correct Answer
✔✔ When the substructure element is on a spread footing
List 3 underwater inspection methods. - Correct Answer ✔✔ Wading, diving, advanced
technologies
What dive safety regulations does the NBIS require be followed? - Correct Answer ✔✔
None, only OSHA requires dive regulations
Name four types of underwater inspections - Correct Answer ✔✔ Initial, routine, interim,
damage
What is the purpose of a hazard analysis? - Correct Answer ✔✔ Identify and mitigate
hazards
