EXAM 3 CHAO WANG CM 2113 EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+|BRAND NEW VERSION!!
The ________________ is very effective for side-casting material, particularly for backfilling or making
sidehill cuts. - CORRECT ANSWERS-Angle Blade
__________ is a technique whereby the blade end spillage from the first pass or the sidewalls from
previous cuts are used to hold the material in front of the dozer blade on subsequent passes. -
CORRECT ANSWERS-Slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your project? -
CORRECT ANSWERS-Scraper configuration, volume of material and job size
Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to
3,000ft medium haul. - CORRECT ANSWERS-True
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed. - CORRECT
ANSWERS-False
Which of the following work tasks can be performed by a dozer? - CORRECT ANSWERS-
Spreading, Striping and Backfilling
A contractor has a project involving the construction of a small manufacturing plant. The contractor has
selected a borrow site and has decided to use 27-cubic yard dump trucks to haul the needed fill material.
The contractor has decided to use a hydraulic excavator with a shovel attachment to load the trucks. The
excavator has expected productivity as 422cy/hr at 100% efficiency, and the truck cycle time excluding
loading is 0.48hr. The job site operation efficiency is assumed as 0.8. Please answer the next two
questions.
What is the expected fleet production if only 6 trucks are available to the fleet? - CORRECT
ANSWERS-238 cy/hr
Buckets of loaders are rated in both heaped and struck capacities. _________________ is based on the
SAE standard of a 2:1 material repose angle. - CORRECT ANSWERS-Heaped capacity
, Which of the following is a job condition that could affect the operator's job efficiency? - CORRECT
ANSWERS-Surface and weather conditions
Fill factor is the ratio of the actual loose volume of material in the bucket compared to the bucket's
rated-heaped capacity. It varies based on the type of material being handled and the type of excavator. -
CORRECT ANSWERS-True
A contractor has decided to use a dragline to excavate a ditch to drain stormwater runoff from her
construction site. The material to be excavated is a light moist clay weighing 2,000 pounds per bank
cubic yard with a swell of 18% and shrinkage of 25%. Given the density of the material to be loaded, the
contractor has determined that the largest heavy-duty dragline bucket that can be safely mounted on
the crane has a rated capacity of 2.5 cubic yards. We assume that we know the average depth of the dig
is 11.9 feet and the average angle of the swing is 75 degrees, and the contractor plans to operate the
machine about 48 minutes per hour. Please answer this question based on the following given tables. -
CORRECT ANSWERS-305 BCY/hr
What is the optimum depth of cut for this machine based on the given scenario? - CORRECT
ANSWERS-8.5ft
What is the swing-depth factor for this machine based on the given scenario? - CORRECT
ANSWERS-1.00
What is the job efficiency for this machine based on the given scenario? - CORRECT
ANSWERS-.8
What is the actual production rate for this machine based on the given scenario? - CORRECT
ANSWERS-244 BCY/hr
Which of the following is not a disadvantage of a crawler crane? - CORRECT ANSWERS-limited
capacity
Using Fig. 17.13, select the minimum-length boom required to hoist a load of 80,000 lb from a truck at
ground level and place it on a platform 76 ft above the ground. The minimum allowable vertical distance
QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+|BRAND NEW VERSION!!
The ________________ is very effective for side-casting material, particularly for backfilling or making
sidehill cuts. - CORRECT ANSWERS-Angle Blade
__________ is a technique whereby the blade end spillage from the first pass or the sidewalls from
previous cuts are used to hold the material in front of the dozer blade on subsequent passes. -
CORRECT ANSWERS-Slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your project? -
CORRECT ANSWERS-Scraper configuration, volume of material and job size
Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to
3,000ft medium haul. - CORRECT ANSWERS-True
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed. - CORRECT
ANSWERS-False
Which of the following work tasks can be performed by a dozer? - CORRECT ANSWERS-
Spreading, Striping and Backfilling
A contractor has a project involving the construction of a small manufacturing plant. The contractor has
selected a borrow site and has decided to use 27-cubic yard dump trucks to haul the needed fill material.
The contractor has decided to use a hydraulic excavator with a shovel attachment to load the trucks. The
excavator has expected productivity as 422cy/hr at 100% efficiency, and the truck cycle time excluding
loading is 0.48hr. The job site operation efficiency is assumed as 0.8. Please answer the next two
questions.
What is the expected fleet production if only 6 trucks are available to the fleet? - CORRECT
ANSWERS-238 cy/hr
Buckets of loaders are rated in both heaped and struck capacities. _________________ is based on the
SAE standard of a 2:1 material repose angle. - CORRECT ANSWERS-Heaped capacity
, Which of the following is a job condition that could affect the operator's job efficiency? - CORRECT
ANSWERS-Surface and weather conditions
Fill factor is the ratio of the actual loose volume of material in the bucket compared to the bucket's
rated-heaped capacity. It varies based on the type of material being handled and the type of excavator. -
CORRECT ANSWERS-True
A contractor has decided to use a dragline to excavate a ditch to drain stormwater runoff from her
construction site. The material to be excavated is a light moist clay weighing 2,000 pounds per bank
cubic yard with a swell of 18% and shrinkage of 25%. Given the density of the material to be loaded, the
contractor has determined that the largest heavy-duty dragline bucket that can be safely mounted on
the crane has a rated capacity of 2.5 cubic yards. We assume that we know the average depth of the dig
is 11.9 feet and the average angle of the swing is 75 degrees, and the contractor plans to operate the
machine about 48 minutes per hour. Please answer this question based on the following given tables. -
CORRECT ANSWERS-305 BCY/hr
What is the optimum depth of cut for this machine based on the given scenario? - CORRECT
ANSWERS-8.5ft
What is the swing-depth factor for this machine based on the given scenario? - CORRECT
ANSWERS-1.00
What is the job efficiency for this machine based on the given scenario? - CORRECT
ANSWERS-.8
What is the actual production rate for this machine based on the given scenario? - CORRECT
ANSWERS-244 BCY/hr
Which of the following is not a disadvantage of a crawler crane? - CORRECT ANSWERS-limited
capacity
Using Fig. 17.13, select the minimum-length boom required to hoist a load of 80,000 lb from a truck at
ground level and place it on a platform 76 ft above the ground. The minimum allowable vertical distance
