CDT Risk Management & Site Safety 5

Question 1

Under the OSHA Excavation Standard (29 CFR 1926 Subpart P), a competent person must inspect excavations:

Accepted Answer

Daily and after any event that could have changed conditions, such as rain

Answer

OSHA requires a competent person to inspect excavations daily prior to worker entry and after any event (rain, vibration, freeze-thaw) that could have destabilized the excavation.

Question 2

A fire protection drawing shows a 'sprinkler demand point' connected to a hydraulic calculation. This information is critical for risk management because it ensures:

Accepted Answer

The water supply can meet the design demand flow and pressure to control a fire

Answer

Hydraulic calculations verify that the available water supply meets or exceeds the system's design demand, ensuring the sprinkler system will perform as intended during a fire event.

Question 3

The purpose of a 'safety catch' or 'secondary retention' device shown on crane rigging details is to:

Accepted Answer

Prevent the load from accidentally disengaging from the hook

Answer

Safety catches (latch mechanisms) on rigging hooks prevent accidental load release due to snagging, improper seating, or sudden slack, which could cause a dropped-load fatality.

Question 4

When electrical single-line drawings show an 'arc flash hazard boundary,' this boundary defines:

Accepted Answer

The distance at which a person could receive a second-degree burn from an arc flash incident

Answer

Per NFPA 70E, the arc flash boundary is the distance at which incident energy equals 1.2 cal/cm²—the threshold for a second-degree burn without PPE.

Question 5

A drafting technician adds a 'traffic control plan' drawing to a set of roadway construction documents. The PRIMARY safety purpose of this drawing is to:

Accepted Answer

Protect workers and road users from collisions during construction activities

Answer

Traffic control plans establish buffer zones, signage, flagging, and channelization devices to separate workers from live traffic, preventing struck-by fatalities—the leading cause of roadway construction deaths.

(CDT) Certified Drafting Technician Practice Test

(CDT) Certified Drafting Technician Practice Test

CDT Risk Management & Site Safety 5