Plumbing Water Supply Systems 2

Question 1

What is the purpose of a tempering valve (mixing valve) on a water heater?

Accepted Answer

To blend hot and cold water to deliver water at a safe temperature

Answer

To increase water pressure

Answer

To prevent sediment buildup

Answer

To measure water flow rate

Question 2

What is cross-connection in a plumbing system?

Accepted Answer

A physical link between potable water and a non-potable source

Answer

Two pipes crossing each other in a wall

Answer

The connection point of supply and drain lines

Answer

A fitting joining two different pipe sizes

Question 3

What is the recommended setting for a residential water heater thermostat to balance energy efficiency and safety?

Accepted Answer

120°F

Answer

100°F

Answer

140°F

Answer

160°F

Question 4

What is the function of the anode rod in a tank-type water heater?

Accepted Answer

To sacrifice itself to corrosion, protecting the tank lining

Answer

To heat the water

Answer

To filter sediment

Answer

To regulate water pressure

Question 5

What does a pressure and temperature (P&T) relief valve on a water heater do?

Accepted Answer

Automatically releases water if pressure or temperature exceeds safe limits

Answer

Regulates incoming water pressure

Answer

Controls the thermostat setting

Answer

Prevents cold water from entering the tank

Question 6

What is the purpose of a check valve in a water supply system?

Accepted Answer

To allow water flow in only one direction

Answer

To reduce water pressure

Answer

To filter debris from water

Answer

To measure water consumption