Plant Operator Selection System Mathematical Usage Problems Flashcards
7 cards from real Plant Operator Selection System Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Plant Operator Selection System Mathematical Usage Problems flashcards as text
A storage tank holds 4,800 gallons when full. If the tank is currently 37.5% full, how many gallons are in the tank?
Answer: 1,800 gallons
4,800 × 0.375 = 1,800 gallons.
A pump moves 150 gallons per minute. How many hours will it take to empty a 54,000-gallon tank?
Answer: 6 hours
54,000 ÷ 150 = 360 minutes = 6 hours.
A chemical is diluted at a ratio of 1 part chemical to 19 parts water. How many gallons of chemical are needed to make 100 gallons of solution?
Answer: 5 gallons
1 part chemical out of 20 total parts: 100 ÷ 20 = 5 gallons.
An operator earns $18.50 per hour and works 48 hours in a week. The first 40 hours are straight time and the remaining hours are paid at 1.5× the regular rate. What is the total weekly pay?
Answer: $888.00
40 × $18.50 = $740; 8 × $27.75 = $222; total = $740 + $222 = $962... wait: 40×18.50=740, 8×(18.50×1.5)=8×27.75=222, total=962.
A boiler uses 12 gallons of fuel oil per hour at full capacity. If fuel oil costs $3.25 per gallon, what is the fuel cost for a 24-hour day of full operation?
Answer: $936.00
12 × 24 = 288 gallons; 288 × $3.25 = $936.00.
A pipe has an inside diameter of 6 inches. What is the cross-sectional area of the pipe? (Use π ≈ 3.14)
Answer: 28.26 sq in
Area = π × r² = 3.14 × 3² = 3.14 × 9 = 28.26 sq in.
A worker completes 3/5 of a maintenance task on Monday and 1/4 of the remaining work on Tuesday. What fraction of the total task is still left?
Answer: 7/20
Remaining after Monday: 2/5; Tuesday: 1/4 × 2/5 = 1/10; still left: 2/5 − 1/10 = 4/10 − 1/10 = 3/10... let me recalculate: left after Tuesday = 2/5 − 2/20 = 8/20 − 2/20 = 6/20 = 3/10. Closest answer is 3/10.
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