Safety Practice Questions for Level 2 · Intermediate

1. Question 1

   A crew is assigning roles for a permit-required wet-well entry. Which duty belongs to the attendant?

   1. Stay outside, track the entrants, communicate with them, and summon rescue when needed.
   2. Enter the wet well, watch the repair, and leave to call rescue if an entrant needs help.
   3. Sign the entry permit, verify acceptable entry conditions, and cancel the permit after the work.
   4. Repair the pump inside the wet well and report changing conditions to the entry supervisor.
   Show the answer

   Answer: A. Stay outside, track the entrants, communicate with them, and summon rescue when needed.

   The attendant stays outside, keeps track of entrants, communicates with them, and summons rescue when needed. For example, the attendant is the outside watch, not a second mechanic. B sends the attendant inside, C gives entry-supervisor duties to the attendant, and D assigns the attendant the entrant's repair work.

2. Question 2

   An operator smells rotten eggs near a low, covered channel, but the odor soon seems to fade. What does that change mean?

   1. The gas has moved upward because hydrogen sulfide is lighter than air in calm spaces.
   2. The channel is clear once the odor fades, but the operator should document where it was noticed.
   3. The gas has probably changed into methane, so the flammable-gas reading is the main concern.
   4. Hydrogen sulfide may still be present because it can quickly reduce the sense of smell.
   Show the answer

   Answer: D. Hydrogen sulfide may still be present because it can quickly reduce the sense of smell.

   Hydrogen sulfide can dull the sense of smell, so fading odor does not show that the gas is gone. It is like a warning bell that can stop working while the hazard remains. A reverses how the gas tends to collect, B treats odor as a clearance test, and C changes the gas identity without evidence.

3. Question 3

   A delivery truck must back beside the headworks, and the driver cannot see the full path. Which control fits this task?

   1. Use a trained spotter who stays visible to the driver, with agreed signals and no other duty.
   2. Use a worker near the loading point to call directions while also guiding plant foot traffic.
   3. Use the truck's backup alarm as the signal for nearby workers to clear the marked travel lane.
   4. Use a camera view while another worker checks the delivery papers beside the backing path.
   Show the answer

   Answer: A. Use a trained spotter who stays visible to the driver, with agreed signals and no other duty.

   A trained spotter should stay visible, use agreed signals, and focus only on the backing move. For example, the driver stops if the spotter disappears from view. B divides the spotter's attention, C relies only on an alarm, and D places a distracted worker beside the travel path.

4. Question 4

   Before a shift, an operator applies the specified test gas to a portable gas monitor. Which result shows that the bump test passed?

   1. The display starts, the battery icon appears, and the operator records the monitor number.
   2. One sensor reaches its alarm point, and the operator can verify the other sensor readings.
   3. The monitor completes its start-up check, and the operator documents the displayed date.
   4. Each required sensor responds, and the operator can verify that every audible, visual, and vibrating alarm operates.
   Show the answer

   Answer: D. Each required sensor responds, and the operator can verify that every audible, visual, and vibrating alarm operates.

   A passing bump test shows that the required sensors respond to test gas and that each alarm works. It is like pressing a smoke-alarm test button and hearing the alarm before relying on it. A and C check electronics but not gas response, while B confirms only one sensor and does not test every alarm.

5. Question 5

   Splash keeps a basin walkway wet, and a thin algae film is forming. What is the proper routine response?

   1. Record the wet area for the next inspection and add warning signs along the full basin walkway.
   2. Remove the algae, correct the drainage or splash source, and mark the area until it is dry.
   3. Review boot tread during the next safety meeting and increase lighting near the wet section.
   4. Rinse the walkway at the end of each shift and document how quickly the surface dries.
   Show the answer

   Answer: B. Remove the algae, correct the drainage or splash source, and mark the area until it is dry.

   Removing the slippery growth and correcting the water source controls the fall hazard; temporary marking protects workers while the surface dries. For example, clearing a plugged drain keeps the same green film from returning after every round. A and D leave the source in place, while C addresses footwear and lighting instead of the slippery surface.

Operator Master has 11 Level 2 · Intermediate safety questions, free.

• Math and Calculations62 questions
• Biological Treatment49 questions
• Plant Operations43 questions
• Pumps and Hydraulics21 questions
• Laboratory20 questions
• Solids Handling11 questions
• Disinfection10 questions
• Regulations and Compliance10 questions
• Primary Treatment8 questions
• Secondary Clarification8 questions
• Grit Removal4 questions
• Headworks and Screening3 questions