Safety — California C-36 Practice Questions

40 questions · 17% of the C-36 Plumbing Trade exam

Worked questions

1. A powered sewage ejector must be cleared by hand. What must occur first?

AReach in between automatic cycles
BUse the float switch as isolation
Isolate and control every hazardous energy source
DAsk a coworker to hold the switch

Why C is correct

Automatic controls can restart unexpectedly, and electrical, pneumatic, hydraulic, gravity, and stored mechanical energy may remain. Lockout, verification, blocking, and task-specific sanitation controls are needed.

2. A torch will be used near a concealed combustible cavity. What is required?

Use authorized hot-work controls
BAim water only at the pipe
CUse oxygen for ventilation
DLeave as soon as flame stops

Why A is correct

Heat can conduct into hidden material and smolder after work ends. Inspection, removal or shielding, permits, extinguishing means, ventilation, fire watch, and post-work monitoring address delayed ignition.

3. Torch work is planned beside combustible framing and concealed cavities. What controls are needed?

AWet only the visible pipe
Apply hot-work and fire-watch controls
CUse oxygen to ventilate the space
DLeave immediately when the flame is off

Why B is correct

Torch heat and sparks can ignite hidden material after work ends. Removal or shielding of combustibles, permits, fire watch, extinguishers, ventilation, and post-work monitoring control that delayed-fire risk.

37 more in the bank

Answers and explanations for these are in the app.

A compressed-gas test is proposed at a pressure beyond the system and test-equipment rating. What should the supervisor do?
A heavy water heater must be moved up stairs through a narrow opening. What should the supervisor plan?
A ladder into a trench ends below the landing and is placed far from workers. What must be corrected?
A metal drain snake will be used beside damaged energized wiring in a wet area. What is the first control?
A plumber must enter a vault with limited access and possible sewer gas. What is required before entry?
A plumber plans to stand on the top cap of a stepladder while pulling heavy pipe. What is the proper response?
A sewer manhole tests oxygen-deficient before entry. What is the proper response?
A wastewater splash reaches a worker's eyes. What action is appropriate?
A worker is exposed to sewage through a cut during repair. Which planning approach is appropriate?
Before mechanized excavation for a new sewer, what is the essential first field control?
Before opening a line previously treated with an unknown drain chemical, what is the safest approach?
Demolition may disturb suspect asbestos insulation and lead-containing material. What should happen before disturbance?
Dry drilling concrete for pipe anchors creates visible dust. What control should be used?
Excavated soil and materials are piled at the edge of an occupied trench. Why is this unsafe?
Old pipe insulation is damaged during remodel and may contain asbestos. What should happen?
Why is compressed air or gas testing more hazardous than a comparable hydrostatic test?
Workers will enter a plumbing trench with a potential cave-in hazard. What must occur before entry?
A large water heater must travel up a narrow stair. What rated handling plan should the supervisor establish?
A line was treated with an unknown drain chemical before the plumber arrived. What should be identified before it is opened?
A metal drain machine will be operated in standing water beside damaged live wiring. Which hazard must be controlled first?
A plumber with an open cut is assigned to a sewage backup. Which exposure, hygiene, and medical-response controls belong in the plan?
A pneumatic test exceeds the lowest-rated fitting and gauge assembly. What should the supervisor change?
A short stepladder forces a worker to stand on its top while handling pipe. What access change is required?
A trench ladder ends below the landing and is remote from the crew. Which access defects must be corrected?
A valve vault has restricted access and possible hydrogen sulfide. Which entry evaluation and controls are required?
A worker will reach into a powered sewage ejector to clear debris. What must happen before contact?
Atmospheric testing finds oxygen deficiency in a sewer manhole. May entry proceed without a permit-space program?
Brazing is planned next to a concealed combustible cavity. Which authorized hot-work controls are required?
Damaged legacy pipe insulation may contain asbestos. What should occur before anyone disturbs it further?
Demolition exposes suspect asbestos wrap and old lead-bearing coating. What must occur before removal continues?
Dry core drilling for piping produces visible concrete dust. Which exposure-control method is required?
Employees will enter a trench with unstable soil and no protective system. What must a competent person provide before entry?
Spoil and pipe bundles are stacked against the lip of an occupied trench. Which hazards do they add?
The sewer alignment is marked, but buried utilities have not been located through the required process. What must precede excavation?
Torch work will heat concealed wood behind a pipe chase. Which permit, shielding, and fire-watch controls apply?
Wastewater splashes directly into a worker's eyes. Which immediate decontamination and reporting action is appropriate?
Why does a pneumatic piping test present more stored-energy risk than a hydrostatic test at similar pressure?

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