CM 2112 MIDTERM QUESTIONS WITH VERIFIED
ANSWERS
The attachment that holds the pile firmly in place during the upstroke of the ram and
prevents distortion to the top of the pile. - Answers - Driving head attachments
The lower end of a driven pile; pile tip. - Answers - Foot of a Pile
The thickness of the metal of a pile - Answers - Wall thickness
A cast-in-place concrete end-bearing pile, frequently patented, constructed so that
concrete is paced or forced out into a bulk or pedestal at the base of the pile - Answers -
Pedestal Pile
A weight configured to slide in pile hammer leads or within a hollow pile which has a
formed bale or swivel at its top by which it can be mechanically lifted and dropped to
drive pile. - Answers - Drop/Gravity Hammer
Power tool used to agitate and consolidate freshly placed concrete and produce contact
with the form. - Answers - Vibrator
A drop hammer can normally deliver 40 to 80 blows per minute. - Answers - False
Concrete piles cure for 21 days or more to reach driving strengths. - Answers - True
A differential-acting hammer is also known as a steam hammer. - Answers - True
The friction pile transmits the load to the soil through the pile's lower tip. - Answers -
False
Non displacement cast-in-place concrete piles require a shell or a pipe. - Answers -
False
Which type of pile hammer is a modified single-acting hammer? - Answers - Differential-
Acting Hammers
Which type of pile combines the advantages of a high-quality concrete core with the
high tensile strength of the external steel casing? - Answers - Steel-Concrete
Composite Piles
What type of leads system is not attached at the bottom of the crane or driving
platform? - Answers - Swing leads
, What type of pile hammer is suitable for driving piles on remote projects that require
only a few piles and for which the time completion is not an important factor? - Answers
- Drop hammer
Which type of pile is excellent for fender system use? - Answers - Plastic with Steel
Pipe Core Piles
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 21,480 lb, what is the recommended hammer weight? - Answers - 21,480
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 23,800 lb, what is the minimum weight that can be used? - Answers - 7854
Materials that will decay or produce subsidence in embankments. - Answers - Muck
Enables either end of the blade to be raised or lowered in the vertical plane of the blade.
- Answers - Tilt
Turning the dozer blade so that it is not perpendicular to the direction of the travel. -
Answers - Angling
A tractor unit that has a blade attached to push material from one location to another. -
Answers - Dozer
A horizontal distance of 100 feet. - Answers - Station
Hauling units that provide relatively low hauling costs because of their high travel
speeds. - Answers - Trucks
If the moisture content of the soil is high, it will be necessary to add water during the
mixing operation. - Answers - False
The mass diagram accounts for only material that must be transported beyond the limits
of the two cross sections that define the volume material. - Answers - True
The greatest advantage of tractor-scraper combinations is their versatility . - Answers -
True
Self-loading scrapers are lighter and less costly to purchase than comparable
conventional scrapers. - Answers - False
The most common method of adding water to a soil is with a water distributor. -
Answers - True
ANSWERS
The attachment that holds the pile firmly in place during the upstroke of the ram and
prevents distortion to the top of the pile. - Answers - Driving head attachments
The lower end of a driven pile; pile tip. - Answers - Foot of a Pile
The thickness of the metal of a pile - Answers - Wall thickness
A cast-in-place concrete end-bearing pile, frequently patented, constructed so that
concrete is paced or forced out into a bulk or pedestal at the base of the pile - Answers -
Pedestal Pile
A weight configured to slide in pile hammer leads or within a hollow pile which has a
formed bale or swivel at its top by which it can be mechanically lifted and dropped to
drive pile. - Answers - Drop/Gravity Hammer
Power tool used to agitate and consolidate freshly placed concrete and produce contact
with the form. - Answers - Vibrator
A drop hammer can normally deliver 40 to 80 blows per minute. - Answers - False
Concrete piles cure for 21 days or more to reach driving strengths. - Answers - True
A differential-acting hammer is also known as a steam hammer. - Answers - True
The friction pile transmits the load to the soil through the pile's lower tip. - Answers -
False
Non displacement cast-in-place concrete piles require a shell or a pipe. - Answers -
False
Which type of pile hammer is a modified single-acting hammer? - Answers - Differential-
Acting Hammers
Which type of pile combines the advantages of a high-quality concrete core with the
high tensile strength of the external steel casing? - Answers - Steel-Concrete
Composite Piles
What type of leads system is not attached at the bottom of the crane or driving
platform? - Answers - Swing leads
, What type of pile hammer is suitable for driving piles on remote projects that require
only a few piles and for which the time completion is not an important factor? - Answers
- Drop hammer
Which type of pile is excellent for fender system use? - Answers - Plastic with Steel
Pipe Core Piles
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 21,480 lb, what is the recommended hammer weight? - Answers - 21,480
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 23,800 lb, what is the minimum weight that can be used? - Answers - 7854
Materials that will decay or produce subsidence in embankments. - Answers - Muck
Enables either end of the blade to be raised or lowered in the vertical plane of the blade.
- Answers - Tilt
Turning the dozer blade so that it is not perpendicular to the direction of the travel. -
Answers - Angling
A tractor unit that has a blade attached to push material from one location to another. -
Answers - Dozer
A horizontal distance of 100 feet. - Answers - Station
Hauling units that provide relatively low hauling costs because of their high travel
speeds. - Answers - Trucks
If the moisture content of the soil is high, it will be necessary to add water during the
mixing operation. - Answers - False
The mass diagram accounts for only material that must be transported beyond the limits
of the two cross sections that define the volume material. - Answers - True
The greatest advantage of tractor-scraper combinations is their versatility . - Answers -
True
Self-loading scrapers are lighter and less costly to purchase than comparable
conventional scrapers. - Answers - False
The most common method of adding water to a soil is with a water distributor. -
Answers - True
