CPO CPO Pool Equipment and Mechanical Systems Questions and Answers

Question 1

What is the primary purpose of a pool pump's strainer basket?

Accepted Answer

To collect debris before water enters the pump impeller

Answer

The strainer basket catches leaves, hair, and other debris before they can reach and damage the pump impeller.

Question 2

What does TDH stand for in pool pump hydraulics?

Accepted Answer

Total Dynamic Head

Answer

Total Dynamic Head (TDH) is the total resistance a pump must overcome, combining suction and discharge head losses.

Question 3

At what pressure rise above the clean starting pressure should a sand filter typically be backwashed?

Accepted Answer

8–10 PSI

Answer

A sand filter should be backwashed when pressure rises 8–10 PSI above its clean operating pressure, indicating the filter media is clogged.

Question 4

What type of motor is most commonly used in modern variable-speed pool pumps?

Accepted Answer

Permanent magnet motor

Answer

Permanent magnet motors are used in variable-speed pumps because they are highly efficient across a wide range of speeds.

Question 5

What is the purpose of a check valve in pool plumbing?

Accepted Answer

To prevent backflow of water

Answer

A check valve allows water to flow in only one direction, preventing backflow that could contaminate chemical feeders or damage equipment.

CPO (Certified Pool Operator Exam) Practice Test