WorksheetsUnit 33 quiz
Total questions: 19
Worksheet time: 10mins
The expansion tank provides a means of removing the air from the system as well as provides ____.
water for the domestic hot water coil
a space for the water expansion and contraction with water temperature changes
a space for excess water from the supply source
All of the above.
A column of water 1 ft high exerts a pressure of ____.
0.277 psig
0.299 psig
0.433 psig
14.696 psig
The more common type of expansion tank is the ____ expansion tank.
compression
standard
restricted
diaphragm-type
The reason for using zone valves on a hydronic heating system is to ____.
allow different areas of the structure to maintain different temperatures
reduce the chance of a water leak
prevent unused parts of the house from getting warm, and wasting energy
Both a and c.
Air in a hydronic system can cause ____.
reduced water circulation
increased water concentration
corrosion
Both a and c.
A pressure relief valve is set at 30 psig. The valve is constantly opening and flooding the floor. What is causing the relief valve to constantly open?
The water-regulating valve is broken.
The system is overfiring.
The system needs to be calibrated.
The system requires a new boiler.
A high-limit control on a hot water boiler is needed to ____.
regulate the amount of water to each section of baseboard
regulate the water in the supply line to the boiler
balance the water flow rate in the piping system
protect the boiler against excessive water temperatures
The pressure relief valve ____.
regulates the pressure of the water in the supply line
is set to relieve the pressure in the boiler below its maximum design pressure
shuts the boiler off if the water temperature gets too high
relieves the pressure in the expansion tank
An expansion joint is a device used to ____.
prevent damage between boiler sections
enlarge the expansion tank in the system
allow for expansion and contraction of the loop piping with water temperature changes
connect the manual vent into the system
A series loop hydronic system is not desirable for use in a large residence because ____.
all of the heated water will flow to all rooms
some rooms will overheat before other rooms are warm
it is difficult to install and maintain
Both a and b.
The series loop system is the hydronic system that is found most often, primarily because of the ____.
heated water flows in the same direction in parallel pipes
first terminal units being supplied will be warmer than the later ones
possibility of having individual temperature control for each area being heated
low installation costs
The more sections a boiler has, the higher its capacity will be.
True
False
Expansion tanks must always be bled from the top until all of the air is removed from it.
True
False
Hydronic heat circulators are centrifugal pumps.
True
False
Automatic air vents rely on an internal disc that swells when water is sensed.
True
False
It is important to note that the air separator does not remove air from the system.
True
False
The only place a bleed valve is needed is on top of the boiler.
True
False
In a series loop, the water going through the last terminal unit will be the same temperature as the water through the first terminal unit.
True
False
A tankless domestic water system provides hot water from a coil in the boiler.
True
False
