Plant Operator Selection System Test Plant Operator Selection System Mathematical Usage Problems 5

Question 1

A plant operates 330 days per year. If production averages 1,250 units per day, how many units are produced annually?

Accepted Answer

412,500

Answer

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?

Accepted Answer

1/6

Answer

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?

Accepted Answer

1,200 gallons

Answer

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)

Accepted Answer

337 gpm

Answer

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?

Accepted Answer

6 cycles

Answer

3 hr 45 min = 3.75 hr; 24 ÷ 3.75 = 6.4, so 6 complete cycles.

Plant Operator Selection System Test Practice Test