Plant Operator Selection System Test Plant Safety Procedures and Regulations 1 — Questions and Answers
Question 1: When a pressure relief valve activates unexpectedly during normal operations, the operator's FIRST action should be to:
- Ignore it if pressure returns to normal quickly
- Notify the control room and monitor the pressure reading (Correct answer)
- Immediately shut down the entire unit
- Increase the feed rate to compensate
Correct answer: Notify the control room and monitor the pressure reading
Unexpected relief valve activation indicates a process upset and must be reported immediately so the control room can assess and respond.
Question 2: A Lockout/Tagout (LOTO) procedure is required before:
- Performing routine instrument readings
- Servicing equipment that could unexpectedly energize (Correct answer)
- Checking oil levels on a stopped pump
- Writing entries in the operations log
Correct answer: Servicing equipment that could unexpectedly energize
LOTO is mandatory before any servicing or maintenance work where unexpected energization could injure workers.
Question 3: The IDLH (Immediately Dangerous to Life or Health) concentration for a gas is the level at which:
- Workers must wear standard dust masks
- Exposure causes mild irritation after 8 hours
- A worker could not escape without severe health effects (Correct answer)
- The gas becomes flammable
Correct answer: A worker could not escape without severe health effects
IDLH defines the concentration from which a worker could not escape within 30 minutes without irreversible harm or death.
Question 4: Which class of fire extinguisher is correct for an electrical equipment fire?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C extinguishers use non-conductive agents and are designed specifically for energized electrical equipment fires.
Question 5: A Safety Data Sheet (SDS) Section 8 provides information on:
- Physical and chemical properties
- Exposure controls and personal protective equipment (Correct answer)
- First aid measures
- Storage and handling
Correct answer: Exposure controls and personal protective equipment
SDS Section 8 covers occupational exposure limits, engineering controls, and required PPE for safe handling.
Question 6: If you smell hydrogen sulfide (H₂S) in a plant area, you should FIRST:
- Search for the source of the leak
- Move upwind and alert others immediately (Correct answer)
- Wait to see if the odor intensifies
- Remove your hard hat to improve detection
Correct answer: Move upwind and alert others immediately
H₂S is immediately toxic; moving upwind and alerting others prevents exposure while initiating an emergency response.
Plant Operator Selection System Test Plant Safety Procedures and Regulations 1
When a pressure relief valve activates unexpectedly during normal operations, the operator's FIRST action should be to: