ABC Pumping Systems and Hydraulics

Question 1

What is the term for the total head a pump must work against, including static head plus friction losses?

Accepted Answer

Total Dynamic Head

Answer

Total Dynamic Head (TDH) is the total equivalent head the pump must overcome, including static head, friction losses, and minor losses.

Question 2

Cavitation in a centrifugal pump is most directly caused by which condition?

Accepted Answer

Insufficient Net Positive Suction Head Available (NPSHa)

Answer

Cavitation occurs when the available NPSH falls below the required NPSH, causing the liquid to vaporize at the impeller inlet.

Question 3

On a pump curve, the point where the pump curve intersects the system curve is called the:

Accepted Answer

Operating Point

Answer

The operating point (or duty point) is where the pump curve crosses the system curve, defining the actual flow and head the pump will deliver.

Question 4

A centrifugal pump running at twice its original speed will produce approximately how many times its original flow rate?

Accepted Answer

2 times

Answer

By the affinity laws, flow rate varies directly with pump speed, so doubling the speed doubles the flow rate.

Question 5

Which type of pump is most commonly used for high-volume, low-pressure water distribution applications?

Accepted Answer

Centrifugal pump

Answer

Centrifugal pumps are preferred for high-volume, low-to-moderate pressure applications like water distribution due to their efficiency and simplicity.

(ABC) Association of Boards of Certification Practice Test

(ABC) Association of Boards of Certification Practice Test

ABC Pumping Systems and Hydraulics