CAT Hydraulics and Plumbing Systems 2

Question 1

What is the primary function of the hair and lint strainer (pump basket) in a pool plumbing system?

Accepted Answer

To protect the pump impeller from debris that could cause damage

Answer

To remove dissolved minerals from the water before it enters the filter

Answer

To regulate water pressure entering the pump housing

Answer

To aerate the water and increase dissolved oxygen levels

Question 2

Which type of fitting is used to make a 90-degree change in pipe direction in pool plumbing?

Accepted Answer

Elbow

Answer

Coupling

Answer

Tee

Answer

Union

Question 3

What is the main advantage of using a union fitting in pool equipment plumbing?

Accepted Answer

It allows disconnection of components for maintenance without cutting pipe

Answer

It permanently joins two pipes for a leak-free seal

Answer

It reduces pipe diameter to increase flow velocity

Answer

It increases system pressure at the equipment connection point

Question 4

What is the function of a vacuum breaker installed in a pool plumbing system?

Accepted Answer

To prevent siphoning and backflow by admitting air when negative pressure occurs

Answer

To create the suction force needed at the main drain

Answer

To measure and display negative pressure in suction lines

Answer

To boost pump suction capacity for above-grade pump installations

Question 5

Which type of valve is preferred as a full-flow shut-off valve in pool plumbing because it provides minimal flow resistance when fully open?

Accepted Answer

Ball valve

Answer

Gate valve

Answer

Globe valve

Answer

Butterfly valve

Question 6

What does a sight glass installed in pool piping allow the technician to observe?

Accepted Answer

Flow conditions and the presence of air bubbles in the system

Answer

Water temperature and thermal stratification in the pipe

Answer

Chemical residual levels in the circulating water

Answer

Pump motor speed and direction of rotation

Question 7

What is the purpose of an air relief valve located at the top of a pool filter tank?

Accepted Answer

To release trapped air from the filter, preventing air locks that reduce filtration efficiency

Answer

To introduce air for oxidation treatment of the pool water

Answer

To control the operating pressure within the filter vessel

Answer

To prevent water hammer when the circulation pump shuts down