Heavy Equipment Operator Certification Exam Prep · Question
An excavator is trenching for a new sewer line. The ground is freezing and thawing daily. What is a specific hazard associated with these conditions?
Repeated freezing and thawing cycles can severely compromise the stability of trench walls. Frost heave can lift and destabilize soil, and subsequent thawing ca
Start free practice for Heavy Equipment Operator Certification Exam Prep
500 questions · no signup required · 40 free questions per day
Question: An excavator is trenching for a new sewer line. The ground is freezing and thawing daily. What is a specific hazard associated with these conditions?
Answer options:
- A. The soil becomes extremely hard, making digging difficult. ✅ B. Increased risk of trench wall instability and collapse due to frost heave and thawing cycles.
- C. The trench bottom becomes perfectly level, simplifying pipe laying.
- D. Utilities become easier to locate due to ground contractions.
Correct answer: B. Increased risk of trench wall instability and collapse due to frost heave and thawing cycles.
Explanation: Repeated freezing and thawing cycles can severely compromise the stability of trench walls. Frost heave can lift and destabilize soil, and subsequent thawing can cause rapid weakening and collapse, making these conditions particularly hazardous for excavation work.
Start free practice for Heavy Equipment Operator Certification Exam Prep
500 questions · no signup required · 40 free questions per day
More about Heavy Equipment Operator Certification Exam Prep
Related Questions
More for Heavy Equipment Operator Certification Exam Prep candidates
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Heavy Equipment Operator Certification Exam Prep Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.