Practice Exam 1 — Regulations & Equipment
1.5 hours
Learning Objectives
- •Apply regulatory knowledge to scenario-based questions
- •Distinguish between MGL, 230 CMR, and OSHA requirements
- •Identify correct answers using process of elimination
Topics Covered
- •Exam strategy: read all options before selecting; eliminate clearly wrong answers first
- •Critical numbers to memorize for the 2A exam:
- • — 70%: minimum passing score
- • — 60 days: wait after failed attempt
- • — 5 feet: Subpart P protective system threshold (no exceptions)
- • — 2 feet: minimum spoil pile setback from trench edge
- • — 25 feet: maximum lateral travel to egress from trench
- • — 4 feet: minimum trench depth requiring egress access point
- • — 1.5 tsf: Type A soil minimum strength
- • — 0.5 tsf: Type C soil maximum strength
- • — 2,000+ psi: typical excavator hydraulic system pressure
- • — 4:1: minimum hydraulic hose burst-to-working-pressure ratio
- • — 10 feet: minimum clearance from energized overhead power lines
- • — 2 feet: minimum distance between tracks and trench edge
- •Common trick questions: "and" vs. "or" conditions; "always" vs. "unless"
Resources
Self-Check Questions
Question 1: A trench is being dug in Type C soil and is 7 feet deep. The contractor wants to slope the trench sides. What is the minimum required horizontal-to-vertical slope ratio for Type C soil?
- A. ¾:1
- B. 1:1
- C. 1½:1(correct)
- D. 2:1
Show Explanation
Explanation:
Type C soil — the least stable classification — requires a minimum 1½ horizontal to 1 vertical (1½:1) slope. This translates to a 34° angle. Type B requires 1:1 (45°), and Type A allows ¾:1 (53°).
Question 2: Which of the following is NOT a manual test method used to classify soil per OSHA Subpart P Appendix A?
- A. Thumb penetration test
- B. Dry strength test
- C. pH strip test(correct)
- D. Plasticity test
Show Explanation
Explanation:
OSHA Appendix A manual tests include thumb penetration, dry strength, plasticity, and visual inspection for fissures and layering. A pH test is not a soil classification method used in excavation safety.
Question 3: An excavator operator is digging within 8 feet of overhead power lines. What must happen before work begins?
- A. A spotter must be assigned
- B. The operator must be informed of the line voltage
- C. The utility must be de-energized or the work halted until safe clearance is established(correct)
- D. Work may proceed as long as the boom does not contact the lines
Show Explanation
Explanation:
OSHA requires a minimum 10-foot clearance from energized lines. At 8 feet, the operator is already inside the exclusion zone. The utility must be de-energized, relocated, or insulated before work can proceed. Working at 8 feet is a violation even with a spotter.
Question 4: Which regulatory body administers the Massachusetts hoisting engineer exam?
- A. OSHA (Occupational Safety and Health Administration)
- B. OPSI (Office of Public Safety and Inspections)(correct)
- C. DOT (Department of Transportation)
- D. NIOSH (National Institute for Occupational Safety and Health)
Show Explanation
Explanation:
The Massachusetts Office of Public Safety and Inspections (OPSI) administers the hoisting engineer exam and issues licenses. OSHA sets the safety regulations but does not administer state licensing.
Question 5: What is the unconfined compressive strength threshold below which soil must be classified as Type C?
- A. Less than 1.5 tsf
- B. Less than 1.0 tsf
- C. Less than 0.5 tsf(correct)
- D. Less than 0.25 tsf
Show Explanation
Explanation:
Type C is defined as soil with unconfined compressive strength less than 0.5 tsf (tons per square foot). This is the weakest classification and requires the most aggressive protective systems. Memorize: A ≥ 1.5 tsf, B = 0.5–1.5 tsf, C < 0.5 tsf.
Question 6: An excavation in Type A soil is 4 feet deep. No protective system has been installed. Is this compliant?
- A. Yes — Type A soil at 4 feet does not require a protective system if the competent person approves(correct)
- B. No — all excavations over 3 feet require a protective system
- C. Yes — no protective system is ever required in Type A soil under 5 feet
- D. No — Type A soil always requires sloping
Show Explanation
Explanation:
At less than 5 feet, OSHA allows no protective system IF the competent person determines no cave-in hazard exists. This is not a blanket exception — it requires an actual competent person evaluation. At 5 feet or deeper, a system is always required regardless of soil type.
Question 7: A worker at the bottom of a 6-foot trench needs to exit quickly. The nearest ladder is 30 feet away. Is this compliant?
- A. Yes — there is no maximum distance requirement for egress
- B. No — OSHA requires egress within 25 feet of lateral travel for all trenches 4 feet or deeper(correct)
- C. Yes — 30 feet is acceptable if a rope or handhold is provided
- D. No — for a 6-foot trench, egress must be within 10 feet
Show Explanation
Explanation:
OSHA 1926.651 requires that employees working in trenches 4 feet or deeper must have egress (ladder, stairway, or ramp) within 25 feet of lateral travel. At 30 feet, this requirement is violated and the employer must add an additional egress point.
Question 8: You are excavating and hit what appears to be bedrock at 3 feet. Vertical walls are left above the rock. Which soil classification applies?
- A. Type A — hard rock is the most stable classification
- B. Stable Rock — if it is natural solid mineral that can be excavated vertically and remains intact(correct)
- C. Type B — rock requires additional verification before stable rock classification
- D. Type C — any previously disturbed area defaults to Type C
Show Explanation
Explanation:
OSHA recognizes "Stable Rock" as a separate category above Type A: natural solid mineral matter that can be excavated with vertical sides and remains intact while exposed. True bedrock qualifies. The competent person must verify it is intact and not fractured or weathered before relying on this classification.
A deeper, regulation-by-regulation companion page for this lesson.