TCM 427 EXAM WITH COMPLETE
SOLUTIONS 100% GUARANTEED
PASS
Why is density important for soil and rock? - Answer- because increased density
typically improves structural performance
Cohesion - Answer- the quality of soil particles to be attracted to like particles, lead
them to stick together (like clay)
Coarse aggregate - Answer- rock or gravel generally greater than 1/4" in size
Fine aggregate - Answer- sand or fine crushed stone, less than 1/4" but greater than a
N0. 200 sieve
Gradation - Answer- the distribution, in percent by weight, of individual particle sizes
When you move rock and dirt the only thing that stays constant is the ______ of the
solid particles (no matter dry or wet) - Answer- weight
When to modify the soil - Answer- -too wet
-too dry
Soil too dry? - Answer- add water by using sprinklers to add moisture to a foundation fill
Soil too wet? - Answer- reduce moisture by disking a heavy clay fill
What can crushed stone be used for? - Answer- -smooth and level roads under the
pavement
-enhance soil to improve crop growing conditions
-stone fill to support pipes and drainage beds
-prevent ice and water erosion when building bridges
-buffer layer between concrete and soil
-decorative purposes in landscaping
Tires - Answer- -simpler to operate
-fuel efficiency
, -smoother operation
-more mobile
Tracks - Answer- -greater stability
-more traction
-better control on slopes or unstable ground
Excavators general purposes - Answer- -excavation
-heavy lifting, demo, removing sediments and debris from bottoms of lake, cutting trees
Excavators include a _______ and _______ - Answer- long arm (boom)
a cab
Types of backhoe attachments - Answer- -bucket
-broom
-snowplow
-grapple
Disadvantages of backhoe compared to an excavator - Answer- -cannot lift much weight
compared to an excavator
-cannot dig as deep
Bulldozers general purpose - Answer- -remove the topsoil
-push material
Most common attachments for bulldozers - Answer- Blades
(most common are: straight blade, U-blade, SU blade, and angle blade)
Bulldozer disadvantages - Answer- Weight compacts soil which may lead to irrigation
issues on shallow soil
Graders are most commonly used on: - Answer- -road construction
-road maintenance/repair and large commercial
Graders general purpose - Answer- -level/flatten soil
Graders disadvantages - Answer- -limited traction because of rubber tires
-not suitable for moving heavy loads
-too large for small projects
Scrapers general purpose - Answer- -scrape and level surface
-material import and export (relocation)
How does a scraper work - Answer- When it is passing over an area that dirt needs to
be removed, the operator drops a sharp horizontal blade located in the trailer into the
SOLUTIONS 100% GUARANTEED
PASS
Why is density important for soil and rock? - Answer- because increased density
typically improves structural performance
Cohesion - Answer- the quality of soil particles to be attracted to like particles, lead
them to stick together (like clay)
Coarse aggregate - Answer- rock or gravel generally greater than 1/4" in size
Fine aggregate - Answer- sand or fine crushed stone, less than 1/4" but greater than a
N0. 200 sieve
Gradation - Answer- the distribution, in percent by weight, of individual particle sizes
When you move rock and dirt the only thing that stays constant is the ______ of the
solid particles (no matter dry or wet) - Answer- weight
When to modify the soil - Answer- -too wet
-too dry
Soil too dry? - Answer- add water by using sprinklers to add moisture to a foundation fill
Soil too wet? - Answer- reduce moisture by disking a heavy clay fill
What can crushed stone be used for? - Answer- -smooth and level roads under the
pavement
-enhance soil to improve crop growing conditions
-stone fill to support pipes and drainage beds
-prevent ice and water erosion when building bridges
-buffer layer between concrete and soil
-decorative purposes in landscaping
Tires - Answer- -simpler to operate
-fuel efficiency
, -smoother operation
-more mobile
Tracks - Answer- -greater stability
-more traction
-better control on slopes or unstable ground
Excavators general purposes - Answer- -excavation
-heavy lifting, demo, removing sediments and debris from bottoms of lake, cutting trees
Excavators include a _______ and _______ - Answer- long arm (boom)
a cab
Types of backhoe attachments - Answer- -bucket
-broom
-snowplow
-grapple
Disadvantages of backhoe compared to an excavator - Answer- -cannot lift much weight
compared to an excavator
-cannot dig as deep
Bulldozers general purpose - Answer- -remove the topsoil
-push material
Most common attachments for bulldozers - Answer- Blades
(most common are: straight blade, U-blade, SU blade, and angle blade)
Bulldozer disadvantages - Answer- Weight compacts soil which may lead to irrigation
issues on shallow soil
Graders are most commonly used on: - Answer- -road construction
-road maintenance/repair and large commercial
Graders general purpose - Answer- -level/flatten soil
Graders disadvantages - Answer- -limited traction because of rubber tires
-not suitable for moving heavy loads
-too large for small projects
Scrapers general purpose - Answer- -scrape and level surface
-material import and export (relocation)
How does a scraper work - Answer- When it is passing over an area that dirt needs to
be removed, the operator drops a sharp horizontal blade located in the trailer into the
