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CM 2113 Exam 3 Chao Wang Study Guide, Exams of Construction

CM 2113 Exam 3 Chao Wang Study Guide

Typology: Exams

2024/2025

Available from 06/20/2025

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CM 2113 Exam 3 Chao Wang Study Guide
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1.
Dozer is good for applications of less than 300ft short
haul, and scraper is good for applications of up to
3,000ft medium haul.
2.
An advantage of a crawler dozer as compared with a
wheel-type dozer is higher speed.
True
False
3.
Which of the following work tasks can be performed by Spreading, Striping and
a dozer?
4.
The
is very effective for side-casting
material, particularly for backfilling or making sidehill
cuts.
5.
is a technique whereby the blade end
spillage from the first pass or the sidewalls from pre-
vious cuts are used to hold the material in front of the
dozer blade on subsequent passes.
6.
Which of the following factors need to be considered
when selecting a proper scraper for your project?
7.
Articulated trucks consist of two individual frames
joined by pin, and can be easily operated over soft
ground.
8.
A contractor wants to investigate the production and
cost differences of using a 4S blade on a crawler-type
dozer (D4H-4S). The material is dry clay and is to be
moved a distance of 150 ft from the beginning of the
cut. The dozing is uphill on a 20% grade. The operator
will have average skill. The site conditions will be dark
Backfilling
Angle
Blade
Slot
dozing
Scraper configuration, vol-
ume of material and job
size
True
.75
pf3
pf4
pf5

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  1. Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to 3,000ft medium haul.
  2. An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed.

True

False

  1. Which of the following work tasks can be performed by Spreading, Striping and a dozer?
  2. The is very effective for side-casting material, particularly for backfilling or making sidehill cuts.
  3. is a technique whereby the blade end spillage from the first pass or the sidewalls from pre- vious cuts are used to hold the material in front of the dozer blade on subsequent passes.
  4. Which of the following factors need to be considered when selecting a proper scraper for your project?
  5. Articulated trucks consist of two individual frames joined by pin, and can be easily operated over soft ground.
  6. A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark

Backfilling

Angle Blade

Slot dozing

Scraper configuration, vol- ume of material and job size

True

for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the operator correction factor?

  1. A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the material-weight correction factor? Assume the percent swell is 12%.
  2. A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the visibility correction factor?
  3. A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the bank

for each scraper is 7.5 min. Following the previous question, what is the expected production rate of this scraper fleet if only one pusher is available?

  1. 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 ex- cavator 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. How many dump trucks will be needed to work with the excavator?
  2. 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 ex- cavator 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 11 trucks are available to the fleet?

422 cy/hr

  1. 238 cy/hr

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 ex- cavator 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?

  1. Buckets of loaders are rated in both heaped and struck Heaped capacity capacities. is based on the SAE stan- dard of a 2:1 material repose angle.
  2. Which of the following is a job condition that could affect the operator's job efficiency?
  3. Fill factor is the ratio of the actual loose volume of material in the bucket compared to the bucket's rat- ed-heaped capacity. It varies based on the type of ma- terial being handled and the type of excavator.
  4. A contractor has decided to use a dragline to exca- vate a ditch to drain stormwater runoff from her con- struction 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

Surface and weather con- ditions

True

305 BCY/hr

tance from the center of rotation of the crane to the hoist line of the crane when lifting a load of 9,000 lb will be 40 ft. Use Table 17.2 crane data to select the minimum length boom required to safely hoist the load.

  1. Liftem High Construction Co. has determined that the No heaviest lift on a project they are estimating weighs 26,000 lb. The project's tower crane will make this lift (see Table 17.3). From the proposed tower crane loca- tion on the building site the required reach for this lift will be 90 ft. The crane will be equipped with an L6 jib and a four-part hoist line. This critical lift is of a piece of HVAC equipment and will require a 1,400-lb spreader bar attached to a 300-lb set of slings. If assembled in the proposed configuration, can the crane safely make the pick?