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