Plant Operator Selection System Test Plant Operator Selection System Tables and Graphs Interpretation 2

Question 1

A process log table shows Reactor A temperature readings at 6-hour intervals: 6am=310°F, 12pm=318°F, 6pm=325°F, 12am=312°F. What is the average temperature over the 24-hour period?

Accepted Answer

316.25°F

Answer

Average = (310 + 318 + 325 + 312) / 4 = 1265 / 4 = 316.25°F.

Question 2

A bar chart shows monthly chemical usage in gallons: Jan=4,200, Feb=3,800, Mar=4,500, Apr=4,100. Which month had the greatest increase compared to the previous month?

Accepted Answer

March

Answer

March increased by 700 gallons over February, which is the largest single-month increase in the dataset.

Question 3

A trend line graph shows pressure rising from 50 psi at 8am to 80 psi at 2pm. If the trend is linear, what was the pressure at 11am?

Accepted Answer

65 psi

Answer

The pressure rises 30 psi over 6 hours (5 psi/hr), so at 11am (3 hours in) it is 50 + 15 = 65 psi.

Question 4

A table lists flow rates for three pumps: Pump 1=240 gpm, Pump 2=185 gpm, Pump 3=205 gpm. If Pump 2 fails, what percentage of total flow capacity is lost?

Accepted Answer

29.4%

Answer

Total capacity = 630 gpm; Pump 2 = 185 gpm; 185/630 × 100 ≈ 29.4%.

Question 5

A pie chart shows the composition of plant downtime: Equipment Failure 40%, Scheduled Maintenance 35%, Operator Error 15%, Other 10%. If total downtime was 200 hours, how many hours were due to scheduled maintenance?

Accepted Answer

70 hours

Answer

35% of 200 hours = 0.35 × 200 = 70 hours of scheduled maintenance.

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Plant Operator Selection System Tables and Graphs Interpretation 2