Plant Operator Selection System Test Plant Operator Selection System Mathematical Usage Problems 5 — Questions and Answers
Question 1: A plant operates 330 days per year. If production averages 1,250 units per day, how many units are produced annually?
- 330,000
- 412,500 (Correct answer)
- 500,000
- 825,000
Correct answer: 412,500
1,250 × 330 = 412,500 units per year.
Question 2: A worker uses 2/3 of a container of lubricant on Machine A and 1/6 of the same container on Machine B. What fraction of the container remains?
- 1/6 (Correct answer)
- 1/3
- 1/2
- 2/3
Correct answer: 1/6
2/3 + 1/6 = 4/6 + 1/6 = 5/6 used; 1 − 5/6 = 1/6 remaining.
Question 3: A pipe leaks at a rate of 0.5 gallons per minute. How many gallons are lost in a 40-hour work week?
- 200 gallons
- 600 gallons
- 1,200 gallons (Correct answer)
- 2,400 gallons
Correct answer: 1,200 gallons
0.5 gpm × 60 × 40 = 0.5 × 2,400 = 1,200 gallons.
Question 4: An operator reads a flow of 45 cubic feet per minute. Approximately how many gallons per minute is this? (1 cu ft ≈ 7.48 gallons)
- 168 gpm
- 228 gpm
- 337 gpm (Correct answer)
- 450 gpm
Correct answer: 337 gpm
45 × 7.48 = 336.6 ≈ 337 gpm.
Question 5: A batch reactor requires 3 hours 45 minutes per cycle. How many complete cycles can be run in a 24-hour period?
- 4 cycles
- 5 cycles
- 6 cycles (Correct answer)
- 7 cycles
Correct answer: 6 cycles
3 hr 45 min = 3.75 hr; 24 ÷ 3.75 = 6.4, so 6 complete cycles.
Question 6: A solution requires a specific gravity of 1.15. If pure water weighs 8.34 lbs/gallon, how much does one gallon of the solution weigh?
- 7.25 lbs
- 8.34 lbs
- 9.19 lbs
- 9.59 lbs (Correct answer)
Correct answer: 9.59 lbs
8.34 × 1.15 = 9.591 ≈ 9.59 lbs/gallon.
Question 7: If 1 inch on a plant diagram equals 25 feet in actual distance, what is the actual distance represented by 3.6 inches on the diagram?
- 72 feet
- 90 feet (Correct answer)
- 108 feet
- 125 feet
Correct answer: 90 feet
3.6 × 25 = 90 feet.
Plant Operator Selection System Test Plant Operator Selection System Mathematical Usage Problems 5
A plant operates 330 days per year.
If production averages 1,250 units per day, how many units are produced annually?