Plant Operator Selection System Test Plant Operator Selection System Mathematical Usage Problems 3

Question 1

A rectangular settling pond is 200 feet long, 80 feet wide, and 6 feet deep. What is the volume in cubic feet?

Accepted Answer

96,000 cu ft

Answer

Volume = 200 × 80 × 6 = 96,000 cubic feet.

Question 2

A pressure gauge reads 85 psi. If atmospheric pressure is 14.7 psi, what is the absolute pressure?

Accepted Answer

99.7 psi

Answer

Absolute pressure = gauge pressure + atmospheric pressure = 85 + 14.7 = 99.7 psi.

Question 3

A flow meter shows 240 gallons per minute. How many gallons flow through in 2.5 hours?

Accepted Answer

36,000 gallons

Answer

240 gpm × 60 min/hr × 2.5 hr = 36,000 gallons.

Question 4

An operator mixes 15 pounds of chemical A with 45 pounds of chemical B. What percentage of the mixture is chemical A?

Accepted Answer

25%

Answer

15 ÷ (15 + 45) = 15 ÷ 60 = 0.25 = 25%.

Question 5

A temperature reading changes from 68°F to 212°F. What is the change in Celsius? (°C = (°F − 32) × 5/9)

Accepted Answer

80°C

Answer

Initial: (68−32)×5/9=20°C; final: (212−32)×5/9=100°C; change=80°C.

Plant Operator Selection System Test Practice Test