CDS Equipment Selection & Operations 2 — Questions and Answers
Question 1: When demolishing a structure near an active roadway, which equipment feature is most critical for maintaining worker safety?
- High-reach boom with cab protection (Correct answer)
- Standard bucket attachment
- Rear-mounted counterweight only
- Rubber tracks for mobility
Correct answer: High-reach boom with cab protection
High-reach excavators with reinforced cab protection guard operators from falling debris when working adjacent to live traffic.
Question 2: A wrecking ball is best suited for which demolition scenario?
- Selective interior demolition
- Demolition of massive concrete or masonry structures (Correct answer)
- Cutting through structural steel beams
- Removing asbestos-containing materials
Correct answer: Demolition of massive concrete or masonry structures
Wrecking balls are most effective against large, solid masonry or concrete structures where precision is less critical.
Question 3: What is the primary reason hydraulic shears are preferred over torches for cutting structural steel in demolition?
- They are cheaper to operate
- They eliminate fire and fume hazards associated with hot work (Correct answer)
- They cut faster than torches
- They require no operator training
Correct answer: They eliminate fire and fume hazards associated with hot work
Hydraulic shears cut steel mechanically, eliminating ignition sources and toxic fumes that torches produce in demolition environments.
Question 4: When selecting a skid-steer loader for interior demolition work, what specification is most important to verify?
- Engine horsepower rating
- Overhead clearance height and turning radius (Correct answer)
- Fuel tank capacity
- Maximum travel speed
Correct answer: Overhead clearance height and turning radius
Interior spaces have low ceilings and tight turns, so a skid-steer must fit within the structural clearances of the building.
Question 5: Which attachment turns a standard excavator into an effective concrete pulverizer during demolition?
- Hydraulic thumb
- Concrete pulverizer (processor) attachment (Correct answer)
- Tilt bucket
- Vibratory compactor
Correct answer: Concrete pulverizer (processor) attachment
A concrete pulverizer attachment mounts to the excavator arm and crushes reinforced concrete while separating rebar.
Question 6: Ground-penetrating radar (GPR) is used before demolition equipment is deployed primarily to:
- Test soil bearing capacity for equipment travel
- Locate underground utilities, voids, and buried structures (Correct answer)
- Determine the hardness of concrete slabs
- Measure ambient noise levels
Correct answer: Locate underground utilities, voids, and buried structures
GPR identifies subsurface utilities, voids, and obstructions that could cause equipment to break through or strike buried lines.
Question 7: What is the correct term for the maximum load an excavator's lifting arrangement can safely handle at a specified radius?
- Bucket capacity
- Rated lift capacity (Correct answer)
- Breakout force
- Swing torque
Correct answer: Rated lift capacity
Rated lift capacity is the manufacturer-certified maximum load at a given boom angle and radius, critical for safe rigging operations.
CDS Equipment Selection & Operations 2
When demolishing a structure near an active roadway, which equipment feature is most critical for maintaining worker safety?