CM 2113 Final exam Questions and Answers Solved Correctly Rated A+
Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to
3,000ft medium haul. - Answers True
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed. - Answers False
Which of the following work tasks can be performed by a dozer? - Answers -Spreading
-Striping
-Backfilling
The ________________ is very effective for side-casting material, particularly for backfilling or making
sidehill cuts. - 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. - Answers
Slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your project? -
Answers -Scraper configuration
-Volume of material
-Job size
Articulated trucks consist of two individual frames joined by pin, and can be easily operated over soft
ground. - Answers True
Buckets of loaders are rated in both heaped and struck capacities. _________________ is based on the
SAE standard of a 2:1 material repose angle. - Answers Heaped capacity
Which of the following is a job condition that could affect the operator's job efficiency? - 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. -
Answers True
Which of the following is not a disadvantage of a crawler crane? - Answers Limited capacity
Straight blades - Answers Shh hi pet and medium distance passes, such as backfilling, grading, and
spreading full material
Universal blades - Answers Working stockpiles and drifting loose or no cohesive materials
Semi-U blade - Answers Combination of the S and U blade designs
, Cushion blades - Answers Mounted on large dozers that are used primarily for push-loading scrapers.
limited utility in pushing material and should not be used for production dozing. Cannot be tilted,
pitched or angled.
Side-to-side - Answers Blade-to-blade dozing. Two machines maneuver so that their blades are next to
each other during the pushing phase of the production cycle.
What factors affect dozer real production rates? - Answers 1. Blade type
2. Type and condition of material
3. Cycle time
Scrapers - Answers Excavating, loading, hauling and dumping material over medium to long haul
distances
Scrapers production cycle - Answers 1. loading
2. haul travel
3. dumping and spreading
4. turn
5. return travel
6. turn getting next load
2-axle scraper - Answers towed by a tractor, effective in short hauls
single powered scraper - Answers one engine
tandem powered scraper - Answers dual engines, greater tractive effort, 25% initially more expensive
then conventional scrapers. For that reason, they commonly considered a specialized machine, open up
a job, work on extremely adverse grades and on soft ground conditions
elevating scrapers - Answers not designed to be push loaders, use a ladder to lift material into the bowl.
However the ladder is dead weight during the haul cycle. Used for utility work, good in small quantity
situations. No pusher is required. They cannot handle rocky materia
auger scraper - Answers self loading scrapers that use a rotating auger to lift material into the bowl.
Available in single and tandem configurations. More costly to own and operate.
push-loaded wheel scraper - Answers has potential for high travel speeds on favorable roads
push-pull tandem powered scrapers - Answers all wheel drive scrapers equipped with coupling devices
that enable 2 scrapers to assist eachother in loading
Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to
3,000ft medium haul. - Answers True
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed. - Answers False
Which of the following work tasks can be performed by a dozer? - Answers -Spreading
-Striping
-Backfilling
The ________________ is very effective for side-casting material, particularly for backfilling or making
sidehill cuts. - 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. - Answers
Slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your project? -
Answers -Scraper configuration
-Volume of material
-Job size
Articulated trucks consist of two individual frames joined by pin, and can be easily operated over soft
ground. - Answers True
Buckets of loaders are rated in both heaped and struck capacities. _________________ is based on the
SAE standard of a 2:1 material repose angle. - Answers Heaped capacity
Which of the following is a job condition that could affect the operator's job efficiency? - 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. -
Answers True
Which of the following is not a disadvantage of a crawler crane? - Answers Limited capacity
Straight blades - Answers Shh hi pet and medium distance passes, such as backfilling, grading, and
spreading full material
Universal blades - Answers Working stockpiles and drifting loose or no cohesive materials
Semi-U blade - Answers Combination of the S and U blade designs
, Cushion blades - Answers Mounted on large dozers that are used primarily for push-loading scrapers.
limited utility in pushing material and should not be used for production dozing. Cannot be tilted,
pitched or angled.
Side-to-side - Answers Blade-to-blade dozing. Two machines maneuver so that their blades are next to
each other during the pushing phase of the production cycle.
What factors affect dozer real production rates? - Answers 1. Blade type
2. Type and condition of material
3. Cycle time
Scrapers - Answers Excavating, loading, hauling and dumping material over medium to long haul
distances
Scrapers production cycle - Answers 1. loading
2. haul travel
3. dumping and spreading
4. turn
5. return travel
6. turn getting next load
2-axle scraper - Answers towed by a tractor, effective in short hauls
single powered scraper - Answers one engine
tandem powered scraper - Answers dual engines, greater tractive effort, 25% initially more expensive
then conventional scrapers. For that reason, they commonly considered a specialized machine, open up
a job, work on extremely adverse grades and on soft ground conditions
elevating scrapers - Answers not designed to be push loaders, use a ladder to lift material into the bowl.
However the ladder is dead weight during the haul cycle. Used for utility work, good in small quantity
situations. No pusher is required. They cannot handle rocky materia
auger scraper - Answers self loading scrapers that use a rotating auger to lift material into the bowl.
Available in single and tandem configurations. More costly to own and operate.
push-loaded wheel scraper - Answers has potential for high travel speeds on favorable roads
push-pull tandem powered scrapers - Answers all wheel drive scrapers equipped with coupling devices
that enable 2 scrapers to assist eachother in loading
