CDS Equipment Selection & Operations 3

Question 1

During high-reach demolition, what is the maximum recommended working height relative to the equipment's rated reach to prevent tip-over?

Accepted Answer

No more than 85% of rated reach

Answer

Operating at no more than 85% of rated reach preserves stability margin and accounts for dynamic loads from debris impact.

Question 2

Which piece of demolition equipment is specifically designed to reduce large concrete slabs into transportable rubble on-site?

Accepted Answer

Mobile jaw crusher

Answer

Mobile jaw crushers process oversized concrete rubble into graded aggregate that can be reused or hauled efficiently.

Question 3

When operating a demolition excavator on soft or saturated soil, the supervisor should first:

Accepted Answer

Install timber mats or steel plates to distribute ground pressure

Answer

Timber mats or steel road plates spread equipment weight to prevent sinking or tipping on soft ground.

Question 4

A dust suppression water cannon mounted on demolition equipment primarily targets which hazard?

Accepted Answer

Airborne silica and debris dust

Answer

Water cannons suppress respirable silica dust generated when concrete and masonry are broken, protecting workers and surrounding areas.

Question 5

What key pre-operation check must be performed on a hydraulic breaker (hoe ram) before beginning work?

Accepted Answer

Verify hydraulic oil flow rate and accumulator nitrogen charge

Answer

Hydraulic breakers require correct oil flow and nitrogen pre-charge in the accumulator to strike efficiently without damaging the carrier.

(CDS) Certified Demolition Supervisor Practice Test