#1
Which of the following is a common hazard associated with excavation work?
Falling objects
ExplanationRisk of falling objects poses a common hazard in excavation.
#2
Which of the following is NOT a recommended safety practice in excavation work?
Using damaged equipment
ExplanationUsing damaged equipment is not a recommended safety practice in excavation.
#3
What is the primary purpose of a trench box in excavation safety?
To prevent cave-ins
ExplanationA trench box is used primarily to prevent cave-ins in excavation.
#4
What is the primary purpose of a trench shield in excavation safety?
To prevent cave-ins
ExplanationA trench shield is primarily used to prevent cave-ins in excavation.
#5
What is the primary purpose of shoring in excavation safety?
To prevent cave-ins
ExplanationShoring is implemented primarily to prevent the collapse of trench walls.
#6
What does the term 'competent person' refer to in excavation safety?
A person capable of identifying hazards
Explanation'Competent person' refers to an individual capable of identifying and addressing excavation hazards.
#7
Which type of soil is considered the most stable for excavation work?
Clay soil
ExplanationClay soil is considered the most stable for excavation due to its cohesive properties.
#8
What is the minimum distance that heavy equipment should be kept from the edge of an excavation?
3 feet
ExplanationHeavy equipment should be kept a minimum of 3 feet away from the edge of an excavation to ensure safety.
#9
What is the recommended slope angle for trench walls in stable soil conditions?
2:1 (63.4 degrees)
ExplanationIn stable soil conditions, a 2:1 slope angle (63.4 degrees) is recommended for trench walls.
#10
What type of protective system relies on hydraulic pressure to support trench walls?
Shoring
ExplanationShoring relies on hydraulic pressure to support trench walls in excavation safety.
#11
What is the primary purpose of benching in excavation safety?
To minimize the risk of collapse
ExplanationBenching is implemented to minimize the risk of trench collapse in excavation safety.
#12
What is the primary purpose of a hydraulic shoring system in excavation safety?
To prevent cave-ins
ExplanationHydraulic shoring systems are used primarily to prevent cave-ins in excavation safety.