CM 2113 CORE MAIN EXAMINATION SET QUESTIONS
AND ANSWERS SURE A+
✔✔all wheel drive scrapers equipped with coupling devices that enable 2 scrapers to
assist each other in loading - ✔✔push-pull tandem powered scrapers
✔✔tandem powered scrapers sometimes require help - ✔✔loading
✔✔suited for jobs where the haul-road rolling resistance is low and grades are minimal.
they become uneconomical when haul grades are greater than 5% and return grades
are greater than 12% - ✔✔single powered axle pusher-loader wheel-tractor scrapers
✔✔heavier and more costly than conventional scrapers, can be economical in isolated
work and for stripping materials - ✔✔self-loading scrapers
✔✔expressed in bank cubic yards, approximated by multiplying the loose volume in the
bowl by an appropriate swell factor - ✔✔the capacity of a scraper
✔✔most common. it permits all scrapers to load in the same area. however, the slowest
bc of the addition to pusher travel distance - ✔✔backtrack loading
✔✔scraper fixed cycle time - ✔✔1. spot time
, 2. load time
3. maneuver and dump time
✔✔- good for short distance
- can handle tight soil
- can push large blade loads
- exerts low ground bearing pressure
- works on almost any terrain
- can work on soft ground and mud slick surfaces - ✔✔crawler dozer
✔✔(tracklaying) - the work horses of the construction industry - ✔✔crawler dozer
✔✔1. size and engine type (gas,diesel)
2. number of gears
3. drive type (2 wheel, 4wheel)
4. number of wheels and axles
5. method of dumping
6. material being hauled
7. holding capacity - ✔✔How to classify trucks
✔✔distance is a major factor in selecting haul units - ✔✔trucks
✔✔they are designed to provide high drawbar pull and tractive effort - ✔✔dozers
✔✔exerts low ground-bearing pressure adding to its versatility - ✔✔crawler dozer
✔✔equipped with a blade are standard equipment for excavating - ✔✔dozers
✔✔equipped with special clearing blades are used for land clearing - ✔✔dozers
✔✔equipped with push blades or blooms are used for assisting scrapers to load -
✔✔dozers
✔✔can have a rear mounted ripper for loosing and breaking up rock - ✔✔dozers
✔✔fill factor - ✔✔adjusts heaped capacity in lcy based on the type of material being
hauled
✔✔Management conditions:
- skill, training, and motivation of workers
- planning, job layout, supervision, and coordination of work
Job conditions:
- topography and work dimensions
- surface and weather conditions - ✔✔Excavators job efficiency
AND ANSWERS SURE A+
✔✔all wheel drive scrapers equipped with coupling devices that enable 2 scrapers to
assist each other in loading - ✔✔push-pull tandem powered scrapers
✔✔tandem powered scrapers sometimes require help - ✔✔loading
✔✔suited for jobs where the haul-road rolling resistance is low and grades are minimal.
they become uneconomical when haul grades are greater than 5% and return grades
are greater than 12% - ✔✔single powered axle pusher-loader wheel-tractor scrapers
✔✔heavier and more costly than conventional scrapers, can be economical in isolated
work and for stripping materials - ✔✔self-loading scrapers
✔✔expressed in bank cubic yards, approximated by multiplying the loose volume in the
bowl by an appropriate swell factor - ✔✔the capacity of a scraper
✔✔most common. it permits all scrapers to load in the same area. however, the slowest
bc of the addition to pusher travel distance - ✔✔backtrack loading
✔✔scraper fixed cycle time - ✔✔1. spot time
, 2. load time
3. maneuver and dump time
✔✔- good for short distance
- can handle tight soil
- can push large blade loads
- exerts low ground bearing pressure
- works on almost any terrain
- can work on soft ground and mud slick surfaces - ✔✔crawler dozer
✔✔(tracklaying) - the work horses of the construction industry - ✔✔crawler dozer
✔✔1. size and engine type (gas,diesel)
2. number of gears
3. drive type (2 wheel, 4wheel)
4. number of wheels and axles
5. method of dumping
6. material being hauled
7. holding capacity - ✔✔How to classify trucks
✔✔distance is a major factor in selecting haul units - ✔✔trucks
✔✔they are designed to provide high drawbar pull and tractive effort - ✔✔dozers
✔✔exerts low ground-bearing pressure adding to its versatility - ✔✔crawler dozer
✔✔equipped with a blade are standard equipment for excavating - ✔✔dozers
✔✔equipped with special clearing blades are used for land clearing - ✔✔dozers
✔✔equipped with push blades or blooms are used for assisting scrapers to load -
✔✔dozers
✔✔can have a rear mounted ripper for loosing and breaking up rock - ✔✔dozers
✔✔fill factor - ✔✔adjusts heaped capacity in lcy based on the type of material being
hauled
✔✔Management conditions:
- skill, training, and motivation of workers
- planning, job layout, supervision, and coordination of work
Job conditions:
- topography and work dimensions
- surface and weather conditions - ✔✔Excavators job efficiency
