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 yes
slip on this surface?
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
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, 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 65,000
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)
8. Continue with the previous question, what minimum .72
value of coefficient of traction between the scraper
wheels and the traveling surface is needed to maintain
maximum possible travel speed?
9. Dozer is good for applications of less than 300ft short true
haul, and scraper is good for applications of up to
3,000ft medium haul.
10. An advantage of a crawler dozer as compared with a false
wheel-type dozer is higher speed.
11. Which of the following work tasks can be performed by all of the above
a dozer?
12. The is very effective for side-casting angle blade
material, particularly for backfilling or making sidehill
cuts.
13. is a technique whereby the blade end slot dozing
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.
2/7
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 yes
slip on this surface?
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
1/7
, 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 65,000
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)
8. Continue with the previous question, what minimum .72
value of coefficient of traction between the scraper
wheels and the traveling surface is needed to maintain
maximum possible travel speed?
9. Dozer is good for applications of less than 300ft short true
haul, and scraper is good for applications of up to
3,000ft medium haul.
10. An advantage of a crawler dozer as compared with a false
wheel-type dozer is higher speed.
11. Which of the following work tasks can be performed by all of the above
a dozer?
12. The is very effective for side-casting angle blade
material, particularly for backfilling or making sidehill
cuts.
13. is a technique whereby the blade end slot dozing
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.
2/7
