CDS Materials & Equipment Knowledge 2

Question 1

Which type of explosive is classified as a 'low explosive' commonly used in demolition blasting agents?

Accepted Answer

ANFO (Ammonium Nitrate/Fuel Oil)

Answer

ANFO is a low-velocity blasting agent commonly used in demolition due to its relative safety and low cost.

Question 2

A wrecking ball used in demolition is typically made of what material?

Accepted Answer

Cast iron or steel

Answer

Wrecking balls are typically made of cast iron or steel to provide the necessary mass and durability for impact demolition.

Question 3

What is the primary purpose of a dust suppression system on a demolition excavator?

Accepted Answer

To minimize airborne particulate during demolition activities

Answer

Dust suppression systems spray water mist to capture airborne particulates, reducing worker exposure and regulatory violations.

Question 4

What does the term 'pre-weakening' refer to in demolition practice?

Accepted Answer

Structurally compromising a building prior to primary demolition

Answer

Pre-weakening involves selectively removing or cutting structural elements before the primary demolition method is applied to control the collapse direction.

Question 5

Which type of saw blade is most appropriate for cutting through reinforced concrete containing rebar?

Accepted Answer

Diamond segmented blade

Answer

Diamond segmented blades are designed to cut through both concrete matrix and embedded rebar without rapid wear.

(CDS) Certified Demolition Supervisor Practice Test

(CDS) Certified Demolition Supervisor Practice Test

CDS Materials & Equipment Knowledge 2