PILE DRIVING EXAMS SCRIPT ALL ANSWERS AND
QUESTIONS SET A+
✔✔False - ✔✔The end-bearing pile transmits the load to the soil through skin friction
between the surface of the pile and the soil
✔✔True - ✔✔sheet piles are used for cutoff walls under dams, cofferdams, bulkhead,
and trenching
✔✔True - ✔✔If timber piles remain permanently wet they can have a very long service
life
✔✔False - ✔✔Untreated timber piles can have a very long service life
✔✔False - ✔✔square and octagonal concrete piles are cast in vertical forms
✔✔True - ✔✔Precast concrete piles can be removed from the forms as soon as the
concrete has a compressive strength of 3,500 psi
✔✔True - ✔✔Concrete piles cure for 21 days or more to reach driving strengths
✔✔True - ✔✔A way of reducing driving stresses on a pile is by inserting an adequate
cushioning material between the pile driver's driving cap and the top of the concrete pile
✔✔ - ✔✔Pile cushions are used on steel piles or timber piles.
✔✔False - ✔✔Driving stresses are not proportional to the ram impact velocity
✔✔False - ✔✔When soil layers with low resistance are encountered, it is important to
increase the ram velocity or stroke of the hammer to have a critical tensile stresses in
the pile
, ✔✔True - ✔✔For cylinder piles, it is important to prevent the soil plug inside the pile
from rising to an elevation above the level of the existing soil on the outside of the piles,
thus creating unequal stresses in the pile
✔✔False - ✔✔Non-displacement cast-in-place concrete piles require a shell or a pipe
✔✔True - ✔✔Typical compressive strengths for the grout are 3,000 to 5,000 psi
✔✔False - ✔✔Concrete piles are more suitable than any other type of piles for
constructing foundations that require piles driven to great depths
✔✔False - ✔✔Compared by pile length, concrete piles tend to be more costly than steel
piles
✔✔True - ✔✔Steel piles have a high load-carrying capacity for a given weight of pile
than concrete piles
✔✔True - ✔✔Compared with concrete piles, steel H piles have better driving
characteristics and can be installed to great depths
✔✔False - ✔✔Steel pipe piles can be susceptible to deflection on striking boulders,
obstructions, or an inclined rock surface
✔✔True - ✔✔Since steel H piles do not cause large soil displacement, they are useful in
urban areas or adjacent to structure where heave of the surrounding ground may cause
problems
✔✔False - ✔✔Steel H piles are most efficient as friction piles as they have substantial
surface area that interacts with the surrounding soil to provide significant frictional load
resistance
✔✔True - ✔✔Steel pipe piles are advantageous for use on jobs where headroom for
driving is limited and short sections must be added to obtain the desired total length
✔✔False - ✔✔For extremely hard soils or soil layers, it may be cost effective to use a
concrete and steel pile
✔✔True - ✔✔Concrete- steel composite piles are used for marine applications
✔✔True - ✔✔Steel- concrete composite piles provide higher durability and improved
drivability
✔✔False - ✔✔varying the amount of steel in the plastic pile core does not alter the pile's
physical properties of toughness, resilience, and specific gravity
QUESTIONS SET A+
✔✔False - ✔✔The end-bearing pile transmits the load to the soil through skin friction
between the surface of the pile and the soil
✔✔True - ✔✔sheet piles are used for cutoff walls under dams, cofferdams, bulkhead,
and trenching
✔✔True - ✔✔If timber piles remain permanently wet they can have a very long service
life
✔✔False - ✔✔Untreated timber piles can have a very long service life
✔✔False - ✔✔square and octagonal concrete piles are cast in vertical forms
✔✔True - ✔✔Precast concrete piles can be removed from the forms as soon as the
concrete has a compressive strength of 3,500 psi
✔✔True - ✔✔Concrete piles cure for 21 days or more to reach driving strengths
✔✔True - ✔✔A way of reducing driving stresses on a pile is by inserting an adequate
cushioning material between the pile driver's driving cap and the top of the concrete pile
✔✔ - ✔✔Pile cushions are used on steel piles or timber piles.
✔✔False - ✔✔Driving stresses are not proportional to the ram impact velocity
✔✔False - ✔✔When soil layers with low resistance are encountered, it is important to
increase the ram velocity or stroke of the hammer to have a critical tensile stresses in
the pile
, ✔✔True - ✔✔For cylinder piles, it is important to prevent the soil plug inside the pile
from rising to an elevation above the level of the existing soil on the outside of the piles,
thus creating unequal stresses in the pile
✔✔False - ✔✔Non-displacement cast-in-place concrete piles require a shell or a pipe
✔✔True - ✔✔Typical compressive strengths for the grout are 3,000 to 5,000 psi
✔✔False - ✔✔Concrete piles are more suitable than any other type of piles for
constructing foundations that require piles driven to great depths
✔✔False - ✔✔Compared by pile length, concrete piles tend to be more costly than steel
piles
✔✔True - ✔✔Steel piles have a high load-carrying capacity for a given weight of pile
than concrete piles
✔✔True - ✔✔Compared with concrete piles, steel H piles have better driving
characteristics and can be installed to great depths
✔✔False - ✔✔Steel pipe piles can be susceptible to deflection on striking boulders,
obstructions, or an inclined rock surface
✔✔True - ✔✔Since steel H piles do not cause large soil displacement, they are useful in
urban areas or adjacent to structure where heave of the surrounding ground may cause
problems
✔✔False - ✔✔Steel H piles are most efficient as friction piles as they have substantial
surface area that interacts with the surrounding soil to provide significant frictional load
resistance
✔✔True - ✔✔Steel pipe piles are advantageous for use on jobs where headroom for
driving is limited and short sections must be added to obtain the desired total length
✔✔False - ✔✔For extremely hard soils or soil layers, it may be cost effective to use a
concrete and steel pile
✔✔True - ✔✔Concrete- steel composite piles are used for marine applications
✔✔True - ✔✔Steel- concrete composite piles provide higher durability and improved
drivability
✔✔False - ✔✔varying the amount of steel in the plastic pile core does not alter the pile's
physical properties of toughness, resilience, and specific gravity
