Water Treatment Operator-in-Training (OIT) Practice Test

Disable ads (and more) with a membership for a one time $4.99 payment

Master the Water Treatment Operator-in-Training Test with quizzes and comprehensive explanations. Learn key concepts, take practice questions, and ensure exam success!

Practice this question and more.


What is the rate of flow in liters per second in a 300mm diameter pipe with a water velocity of 0.8 m/s?

  1. 48 L/s

  2. 57 L/s

  3. 60 L/s

  4. 75 L/s

The correct answer is: 57 L/s

To determine the rate of flow in liters per second in a pipe, you can use the formula for flow rate, which is the product of the cross-sectional area of the pipe and the velocity of the fluid. First, calculate the cross-sectional area of the pipe. The formula for the area \( A \) of a circle is: \[ A = \pi r^2 \] Given that the diameter of the pipe is 300 mm, the radius \( r \) is half of that: \[ r = \frac{300mm}{2} = 150mm = 0.15m \] Now, plug the radius into the area formula: \[ A = \pi (0.15m)^2 \approx \pi \times 0.0225 m^2 \approx 0.0707 m^2 \] Next, multiply the area by the velocity to find the flow rate \( Q \): \[ Q = A \times velocity = 0.0707 m^2 \times 0.8 m/s \approx 0.05656 m^3/s \] Since 1 cubic meter equals 1000 liters, you convert cubic meters to liters: \[ Q \approx 0.