Plant Operator Selection System Test Plant Operator Selection System Reading Comprehension 3

Question 1

Read the following passage and answer the question.

"During startup of a centrifugal compressor, the antisurge valve must remain fully open until the machine reaches minimum operating speed. Closing the valve prematurely can cause surge, which produces damaging pressure oscillations throughout the system."

What is the consequence of closing the antisurge valve too early?

Accepted Answer

Pressure oscillations that can damage the system

Answer

The passage states premature valve closure can cause surge, which produces 'damaging pressure oscillations throughout the system.'

Question 2

Read the following memo excerpt and answer the question.

"Effective Monday, all shift operators are required to complete the pre-shift checklist before signing off on equipment status. The checklist must be signed by both the departing and incoming operators. Unsigned checklists will be treated as incomplete and reported to the shift supervisor."

What happens if a checklist is not signed?

Accepted Answer

It is treated as incomplete and reported to the supervisor

Answer

The memo states unsigned checklists 'will be treated as incomplete and reported to the shift supervisor.'

Question 3

Read the following passage and answer the question.

"Turbine oil must be sampled quarterly and analyzed for viscosity, water content, and particulate contamination. If any parameter falls outside the acceptable range specified in the manufacturer's manual, the oil must be replaced or remediated before the next scheduled sample."

How often must turbine oil be sampled?

Accepted Answer

Quarterly

Answer

The passage explicitly states turbine oil must be sampled 'quarterly,' meaning once every three months.

Question 4

Read the following passage and answer the question.

"Flow meters can drift over time due to wear, coating buildup, or damage. A field verification check compares the meter reading against a reference measurement. If the two values differ by more than 2%, the meter must be recalibrated or replaced."

A flow meter reads 100 GPM while the reference measurement shows 104 GPM. What action is required?

Accepted Answer

Recalibrate or replace the meter

Answer

A difference of 4 GPM on a 104 GPM reference is approximately 3.8%, which exceeds the 2% threshold, requiring recalibration or replacement.

Question 5

Read the following safety bulletin and answer the question.

"Hydrogen sulfide (H₂S) is an extremely hazardous gas. It is heavier than air and tends to accumulate in low-lying areas such as pits, sumps, and trenches. Workers entering these confined spaces must use supplied-air respirators regardless of detector readings."

Why does H₂S pose a particular hazard in pits and trenches?

Accepted Answer

It is heavier than air and accumulates in low areas

Answer

The bulletin states H₂S is 'heavier than air and tends to accumulate in low-lying areas such as pits, sumps, and trenches.'

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Plant Operator Selection System Reading Comprehension 3