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CM 2113 FINAL EXAM – WANG Practice Tests, Exams of Construction

CM 2113 FINAL EXAM – WANG Practice Tests

Typology: Exams

2024/2025

Available from 06/20/2025

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CM 2113 FINAL EXAM WANG Practice Tests
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1.
Usable power depends on project conditionsprimar- true
ily, haul-road surface condition, altitude, and temper-
ature. Underfoot conditions determine how much of
the available power can be transferred to the surface
to propel the machine.
2.
The coefficient of traction can be defined as the factor false
by which the total weight of the equipment should be
multiplied to determine the maximum possible trac-
tive force between the wheels or tracks and the surface
just before slipping will occur.
3.
Assume that a rubber-tired tractor has a total weight of
7500 lb
25,000 lb on its driving wheels. The maximum rimpull
in low gear is 9,000 lb. If the tractor is operating in
wet sand, with a coefficient of traction of 0.30, what is
the maximum possible rimpull prior to slippage of the
tires? (See Example 6.5 in the textbook for reference)
4.
Continue with the previous question, will this tractor
slip on this surface?
yes
5.
Assume that a rubber-tired tractor has a total weight of
15000 lb
25,000 lb on its driving wheels. The maximum rimpull
in low gear is 9,000 lb. If the tractor is operating in
wet sand, with a coefficient of traction of 0.60, what is
the maximum possible rimpull prior to slippage of the
tires?
6.
Continue with the previous question, will this tractor
no
slip on this surface?
7.
90,893
lb
pf3
pf4
pf5

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CM 2113 FINAL EXAM – WANG Practice Tests

  1. Usable power depends on project conditions—primar- true ily, haul-road surface condition, altitude, and temper- ature. Underfoot conditions determine how much of the available power can be transferred to the surface to propel the machine.
  2. The coefficient of traction can be defined as the factor false by which the total weight of the equipment should be multiplied to determine the maximum possible trac- tive force between the wheels or tracks and the surface just before slipping will occur.
  3. Assume that a rubber-tired tractor has a total weight of 7500 lb 25,000 lb on its driving wheels. The maximum rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of 0.30, what is the maximum possible rimpull prior to slippage of the tires? (See Example 6.5 in the textbook for reference)
  4. Continue with the previous question, will this tractor slip on this surface?

yes

  1. Assume that a rubber-tired tractor has a total weight of 15000 lb 25,000 lb on its driving wheels. The maximum rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of 0.60, what is the maximum possible rimpull prior to slippage of the tires?
  2. Continue with the previous question, will this tractor no slip on this surface?
  3. 90,893 lb

CM 2113 FINAL EXAM – WANG Practice Tests

A wheel tractor scraper is used on a road project. When the project begins, the scraper will experience high rolling and grade resistance at one work area. The rim- pull required to maneuver in this work area is 65, lb. In the fully loaded condition, 48% of the total vehicle weight is on the drive wheels. The fully loaded vehicle weight is 189,360 lb. Please calculate how much weight is on the drive wheels. (See Example 6.6 in the textbook for reference)

  1. Continue with the previous question, what minimum value of coefficient of traction between the scraper wheels and the traveling surface is needed to maintain maximum possible travel speed?
  2. Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to 3,000ft medium haul.
  3. 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 all of the above 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.

angle blade

slot dozing

  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 visibility correction factor?
  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 work efficiency 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 state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the grade correction factor?

Please choose a range from the following where your reading will be within.

  1. A contractor is planning to use single pusher scrapers 2 to move 90,000 cubic yards of soil, and the expected production of a single pusher scraper assuming ade- quate pusher support is 230cy/hr. It has been decided there will be total 8 scrapers operating on the site with a back-track loading method. The estimated cycle time for each scraper is 7.5 min. How many pushers are required to serve the fleet of 8 scrapers?
  2. A contractor is planning to use single pusher scrapers 1,150 cy/hr to move 90,000 cubic yards of soil, and the expected production of a single pusher scraper assuming ade- quate pusher support is 230cy/hr. It has been decided there will be total 8 scrapers operating on the site with a back-track loading method. The estimated cycle time 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?
  3. A contractor has a project involving the construction 9 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

Which of the following is not a disadvantage of a crawler crane?

  1. Using Fig. 17.13, select the minimum-length boom re- 120 ft quired 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 from the bottom of the load to the boom point of the crane is 42 ft. The maximum horizontal distance from the center of rotation of the crane to the hoist line of the crane when lifting the load is 40 ft.
  2. A 25-ton truck-mounted hydraulic crane is being used on a construction site. The maximum horizontal dis- 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.
  3. Liftem High Construction Co. has determined that the 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?

64 ft

no