Master Plumber Exam Jobsite Safety and Regulations 2 — Questions and Answers
Question 1: Under OSHA 29 CFR 1926, what is the minimum distance that a trench must be from a spoil pile to prevent cave-in hazards?
- 2 feet (Correct answer)
- 4 feet
- 6 feet
- 8 feet
Correct answer: 2 feet
OSHA requires spoil piles be placed at least 2 feet from the edge of an excavation to prevent material from falling back in and causing a cave-in.
Question 2: A plumber is working in a trench 6 feet deep in Type B soil. Which protective system is required by OSHA?
- Sloping at 1:1 ratio
- Shoring or trench box (Correct answer)
- Sloping at 3/4:1 ratio
- No protection required at this depth
Correct answer: Shoring or trench box
Type B soil requires sloping at 1:1 or a protective system such as shoring or a trench box for excavations deeper than 5 feet.
Question 3: Which agency is responsible for enforcing the Hazard Communication Standard (HazCom) on construction jobsites?
- EPA
- OSHA (Correct answer)
- NIOSH
- CPSC
Correct answer: OSHA
OSHA enforces the Hazard Communication Standard (29 CFR 1910.1200) which requires proper labeling and SDS for hazardous chemicals on jobsites.
Question 4: When is a Safety Data Sheet (SDS) required to be available on a jobsite?
- Only when requested by a worker
- Only when the chemical is first delivered
- At all times when hazardous chemicals are present (Correct answer)
- Only during OSHA inspections
Correct answer: At all times when hazardous chemicals are present
OSHA requires SDS documents to be readily accessible to employees at all times during their work shift when hazardous chemicals are in the workplace.
Question 5: A master plumber supervising a crew must ensure workers receive fall protection training when working at or above what height on a construction site?
- 4 feet
- 6 feet (Correct answer)
- 8 feet
- 10 feet
Correct answer: 6 feet
OSHA 1926.502 requires fall protection for construction workers at elevations of 6 feet or more above a lower level.
Question 6: Under the OSHA Lockout/Tagout standard, what must be done FIRST before servicing pressurized plumbing systems?
- Post a warning sign
- Notify the building owner
- Isolate and de-energize the energy source (Correct answer)
- Don PPE appropriate for the pressure level
Correct answer: Isolate and de-energize the energy source
OSHA's control of hazardous energy standard (29 CFR 1910.147) requires isolation and de-energizing of energy sources before any servicing begins.
Question 7: Which type of respirator is required when working in an atmosphere with an unknown oxygen level in a confined space?
- N95 filtering facepiece
- Half-face air-purifying respirator
- Self-Contained Breathing Apparatus (SCBA) (Correct answer)
- Powered Air-Purifying Respirator (PAPR)
Correct answer: Self-Contained Breathing Apparatus (SCBA)
When oxygen levels are unknown or deficient in a confined space, a SCBA must be used because air-purifying respirators do not supply oxygen.
Master Plumber Exam Jobsite Safety and Regulations 2
Under OSHA 29 CFR 1926, what is the minimum distance that a trench must be from a spoil pile to prevent cave-in hazards?