CDS Risk Management & Site Safety 3

Question 1

What is the minimum safe approach distance for unqualified workers from energized overhead power lines rated up to 50 kV?

Accepted Answer

10 feet

Answer

OSHA 29 CFR 1926.1408 requires unqualified workers to maintain at least 10 feet of clearance from overhead power lines rated up to 50 kV.

Question 2

During selective demolition of a multi-story building, floors should generally be removed in what order?

Accepted Answer

Top to bottom to prevent overloading lower floors

Answer

Demolition proceeds top to bottom to prevent overloading lower structural members and to maintain control over debris accumulation and structural stability.

Question 3

What is a leading indicator in demolition safety management?

Accepted Answer

A trend in near-miss incident reports filed this quarter

Answer

Leading indicators like near-miss reports measure proactive safety performance and predict future incidents before injuries occur, unlike lagging indicators.

Question 4

When using a wrecking ball for demolition, the ball weight should generally not exceed what percentage of the crane's rated capacity?

Accepted Answer

50%

Answer

Industry practice limits the wrecking ball to 50% of the crane's rated capacity to account for dynamic loading forces during swinging operations.

Question 5

A risk matrix in demolition safety is used to:

Accepted Answer

Prioritize hazards based on likelihood and severity

Answer

A risk matrix plots hazard likelihood against consequence severity to help prioritize which risks require immediate corrective action.

(CDS) Certified Demolition Supervisor Practice Test

(CDS) Certified Demolition Supervisor Practice Test

CDS Risk Management & Site Safety 3