Plant Operator Selection System Test Plant Operator Selection System Technical Manual Interpretation 3

Question 1

A procedure states that a tank level must be maintained between 40% and 60%. An operator's log shows readings of: 55%, 58%, 62%, 59%, 61%. Which reading(s) require corrective action?

Accepted Answer

62% and 61% only

Answer

Readings of 62% and 61% exceed the upper limit of 60% and require corrective action to bring the level back within range.

Question 2

A manual describes a pressure relief valve that 'opens at 150 PSIG and reseats at 140 PSIG.' Operating pressure is currently 145 PSIG. What can be concluded?

Accepted Answer

The relief valve is closed because pressure has not reached the set point

Answer

Since operating pressure (145 PSIG) is below the opening set point (150 PSIG), the relief valve remains closed.

Question 3

A schematic shows four valves in series labeled V-1, V-2, V-3, V-4. The legend shows V-1 and V-3 as 'normally closed' (NC) and V-2 and V-4 as 'normally open' (NO). During a power failure, what is the expected state of V-2?

Accepted Answer

Open, because it is normally open

Answer

A 'normally open' valve designation means it defaults to the open position when de-energized or in a failsafe condition such as power loss.

Question 4

A technical manual section heading reads: 'Section 4.3.2 — Emergency Shutdown Sequence.' Under this heading, steps are numbered 4.3.2.1 through 4.3.2.9. What does this numbering system indicate?

Accepted Answer

These steps are subsections of a larger chapter and section hierarchy

Answer

Hierarchical numbering (4.3.2.x) indicates these steps belong to subsection 2 of section 3 of chapter 4, showing document organization.

Question 5

A table in a manual lists the following alarm setpoints for Tank T-201: Low Level = 20%, Low-Low Level = 10%, High Level = 80%, High-High Level = 90%. The tank reads 85%. Which alarms are active?

Accepted Answer

High Level only

Answer

At 85%, the tank exceeds the High Level setpoint (80%) but has not reached the High-High Level setpoint (90%), so only the High Level alarm is active.

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Plant Operator Selection System Technical Manual Interpretation 3