OIT OIT Pumping Systems and Hydraulics

Question 1

What is the term for the total head a pump must overcome, including elevation, friction, and pressure differences?

Accepted Answer

Total dynamic head (TDH)

Answer

Total dynamic head (TDH) is the total head a pump must overcome and includes static lift, friction losses, and pressure requirements.

Question 2

What type of pump is most commonly used in water and wastewater treatment facilities?

Accepted Answer

Centrifugal pump

Answer

Centrifugal pumps are the most widely used pumps in water and wastewater treatment due to their simplicity, reliability, and efficiency.

Question 3

What does NPSH stand for in pump hydraulics?

Accepted Answer

Net Positive Suction Head

Answer

NPSH (Net Positive Suction Head) is the pressure available at the pump inlet above the vapor pressure of the liquid, critical for preventing cavitation.

Question 4

What condition occurs when vapor bubbles form and collapse inside a pump due to low suction pressure?

Accepted Answer

Cavitation

Answer

Cavitation occurs when local pressure drops below the liquid's vapor pressure, forming bubbles that violently collapse and damage pump components.

Question 5

What is the purpose of a check valve installed on the discharge side of a pump?

Accepted Answer

To prevent backflow when the pump stops

Answer

A discharge check valve prevents water from flowing backward through the pump when it shuts down, protecting the pump and maintaining system pressure.

(OIT) Operator in Training Practice Test

(OIT) Operator in Training Practice Test

OIT OIT Pumping Systems and Hydraulics