Children's Health | Plumbing System Operations 201

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Question 1 of 8

1. Question
Which of the following terms is best defined as the stationary portion of the valve that stops flow completely, when in contact with the movable portion?
- Valve seat
- Valve case
- Valve plug
- Valve port
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Question 2 of 8

2. Question
Which of the following phrases best describes the function of expansion tanks in hydronic heating systems?
- Limits the increase in system pressure
- Limits the decrease in system pressure
- Limits the increase in system temperature
- Limits the decrease in system temperature
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Question 3 of 8

3. Question
Which of the following phrases best describes how an expansion tank operates?
- Uses the pressure of air to control the pressure of an increased volume of water
- Uses compressed air to control the pressure of a decreased volume of water
- Prevents stored water from getting too cold or too hot
- Stores water in a single location so that it can be used in the system
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Question 4 of 8

4. Question
What pipe material can be used for laboratory waste and vent applications?
- acid-resistant
- cast iron
- copper
- galvanized steel
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Question 5 of 8

5. Question
What is the typical steam pressure for a domestic hot water heater?
- low pressure steam: 5 to 20 PSI
- high pressure steam: 60+ PSI
- medium pressure steam: 20 to 60 PSI
- extra-low pressure steam: less than 5 PSI
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Question 6 of 8

6. Question
What is the protocol for turning the domestic hot or cold water over for domestic use after it has been down for 2 or more weeks?
- Flush water out from the system until the desired chlorine levels are achieved.
- Flush water out from the system until the water runs clear and tepid – minimum 3 minutes.
- Shock the domestic water system with additional chemical treatment for a minimum of 24 hours.
- Test the water for Legionella and treat accordingly.
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Question 7 of 8

7. Question
Where should an isolation valve be installed in relation to the dielectric union when connecting two different piping materials?
- Immediately upstream of the union on the supply line
- Anywhere between the union and downstream of the equipment
- Immediately downstream of the union on the supply line
- Immediately upstream of the union on the return line
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Question 8 of 8

8. Question
What type of backflow protection is typically used for a standard sink faucet?
- 2” minimum air gap between the space where the water comes from the faucet and the flood rim of the fixture
- backflow preventer
- check valve
- Backflow protection is not required on standard sink connections.
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Children’s Health | Plumbing System Operations 201

Children’s Health | Plumbing System Operations 201

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