NHI EXAM QUESTIONS AND
ANSWERS 100% ACCURATE
What is the normal maximum interval for above water routine inspections? -
ANSWER-24 months
What is the normal maximum interval for underwater routine inspections? -
ANSWER-60 months
What are the factors that require a shorter interval for routine underwater
inspections? - ANSWER-Age, condition, aggressive environment, channel instability
What should be the scope of a routine underwater inspection? - ANSWER-100%
level 1, 10% level 2, scour assessment
What is the NBI and what does it contain? - ANSWER-National Bridge Inventory, list
of bridges
When must multiple culverts be considered as bridges? - ANSWER-When the out to
out dimension of the bridge extends 20 ft.
What are the three categories of loads bridges are subjected to? - ANSWER-Dead
load, live load, secondary load
What is the purpose of a foundation seal? - ANSWER-To seal bottom of cofferdam
during construction of substructure
In assembling an underwater bridge inspection team, what personnel qualifications
should be considered? - ANSWER-Inspection qualifications and diving qualifications
Name two types of corrosion. - ANSWER-electrochemical, MIC
Name three elements necessary for electrochemical corrosion. - ANSWER-Flow of
electrical current, electrolyte, oxygen
What is the most severe waterfront zone for corrosion? - ANSWER-Splashzone
For an in-service bridge, when is the condition of the seal important? - ANSWER-
When the substructure element is on a spread footing
List 3 underwater inspection methods. - ANSWER-Wading, diving, advanced
technologies
What dive safety regulations does the NBIS require be followed? - ANSWER-None,
only OSHA requires dive regulations
Name four types of underwater inspections - ANSWER-Initial, routine, interim,
damage
ANSWERS 100% ACCURATE
What is the normal maximum interval for above water routine inspections? -
ANSWER-24 months
What is the normal maximum interval for underwater routine inspections? -
ANSWER-60 months
What are the factors that require a shorter interval for routine underwater
inspections? - ANSWER-Age, condition, aggressive environment, channel instability
What should be the scope of a routine underwater inspection? - ANSWER-100%
level 1, 10% level 2, scour assessment
What is the NBI and what does it contain? - ANSWER-National Bridge Inventory, list
of bridges
When must multiple culverts be considered as bridges? - ANSWER-When the out to
out dimension of the bridge extends 20 ft.
What are the three categories of loads bridges are subjected to? - ANSWER-Dead
load, live load, secondary load
What is the purpose of a foundation seal? - ANSWER-To seal bottom of cofferdam
during construction of substructure
In assembling an underwater bridge inspection team, what personnel qualifications
should be considered? - ANSWER-Inspection qualifications and diving qualifications
Name two types of corrosion. - ANSWER-electrochemical, MIC
Name three elements necessary for electrochemical corrosion. - ANSWER-Flow of
electrical current, electrolyte, oxygen
What is the most severe waterfront zone for corrosion? - ANSWER-Splashzone
For an in-service bridge, when is the condition of the seal important? - ANSWER-
When the substructure element is on a spread footing
List 3 underwater inspection methods. - ANSWER-Wading, diving, advanced
technologies
What dive safety regulations does the NBIS require be followed? - ANSWER-None,
only OSHA requires dive regulations
Name four types of underwater inspections - ANSWER-Initial, routine, interim,
damage
