Chapter 13 - Quiz

Question 1 of 20

1

If properly designed, a closed-loop hydronic system should rid itself of most air within a few days of initial start-up.

Select one of the following:

True
False

Explanation

Question 2 of 20

1

The oxygen that causes corrosion is the same oxygen that forms water molecules.

Select one of the following:

True
False

Explanation

Question 3 of 20

1

Circulators transfer maximum head energy to incompressible fluids (e.g., liquids). A mixture of water and air is an example of an incompressible fluid.

Select one of the following:

True
False

Explanation

Question 4 of 20

1

Air has much lower specific heat and density than water.

Select one of the following:

True
False

Explanation

Question 5 of 20

1

Circulators with internal spring-load check valves installed in vertical piping with upward flow are especially susceptible to air pockets.

Select one of the following:

True
False

Explanation

Question 6 of 20

1

Although water may appear perfectly clear and free of bubbles, it can still contain a significant quantity of air in solution.

Select one of the following:

True
False

Explanation

Question 7 of 20

1

Combined air and dirt separators, or a hydraulic separator with the same capabilities, are never desirable in situations where an older distribution system containing steel or iron piping or radiators will be interfaced to a new boiler.

Select one of the following:

True
False

Explanation

Question 8 of 20

1

Properly designed and installed hydronic systems will always require constant manual air venting.

Select one of the following:

True
False

Explanation

Question 9 of 20

1

Low system pressurization is usually caused by not setting the make-up water system properly.

Select one of the following:

True
False

Explanation

Question 10 of 20

1

Glycol-based antifreezes tend to leave a slippery film on components and tools that eventually turn sticky.

Select one of the following:

True
False

Explanation

Question 11 of 20

1

Flow noise is generated when dissolved gases are released from improperly deaerated fluid due to a __________ in pressure.

Select one of the following:

increase
modulation
equalization
reduction

Explanation

Question 12 of 20

1

Air contains oxygen, and oxygen in contact with ferrous metals creates __________.

Select one of the following:

oxides
antigens
bubbles
deaeration

Explanation

Question 13 of 20

1

A large pocket of air trapped within a system can totally stop flow. This effect is often called air _________.

Select one of the following:

blockage
plugging
binding
trapping

Explanation

Question 14 of 20

1

Dissolved air can also lead to gaseous cavitation. Gaseous cavitation occurs when the pressure on the fluid __________ the saturation pressure of the dissolved gases it contains.

Select one of the following:

equals
drops below
rises above
is double

Explanation

Question 15 of 20

1

When air exists as bubbles, a moving fluid may be able to carry them along through the system. This is called __________ air.

Select one of the following:

entrained
fluid
deaerated
bubbly

Explanation

Question 16 of 20

1

The air removal devices used in small hydronic systems can be classified as either high point vents or __________.

Select one of the following:

"bleeders"
central air separators
"coin vents"
deaerators

Explanation

Question 17 of 20

1

The need for fully automatic (unattended) venting in locations not easily accessed requires a different type of device. A(n) __________ air vent often provided the solution.

Select one of the following:

electronic
top-loaded
ergonomic
float-type

Explanation

Question 18 of 20

1

A(n) __________ is capable of maintaining the system fluid in an unsaturated state of air solubility. This means that the water is always ready to absorb additional air from any areas of the system where it may be present.

Select one of the following:

air purger
coalescing media
microbubble air separator
hygroscopic air vent

Explanation

Question 19 of 20

1

A device that makes short work out of filling and purging residential and light commercial hydronic systems consists of a minimum 1-horsepower swimming pool pump mounted on a 30-gallon plastic trash barrel. This device is called a(n) __________.

Select one of the following:

circulator
purge cart
air scooper
deaerator

Explanation

Question 20 of 20

1

An automatic fluid feeder uses a small positive displacement pump operated by a pressure sensing switch to automatically pump fluid into the system when the pressure __________ a set minimum value.

Select one of the following:

reaches
drops below
exceeds
is stored at

	Created by Neil Revollo about 8 years ago

Air Removal, Filling, and Purging

Chapter 13 - Quiz

Question 1 of 20

If properly designed, a closed-loop hydronic system should rid itself of most air within a few days of initial start-up.

Select one of the following:

Explanation

Question 2 of 20

The oxygen that causes corrosion is the same oxygen that forms water molecules.

Select one of the following:

Explanation

Question 3 of 20

Circulators transfer maximum head energy to incompressible fluids (e.g., liquids). A mixture of water and air is an example of an incompressible fluid.

Select one of the following:

Explanation

Question 4 of 20

Air has much lower specific heat and density than water.

Select one of the following:

Explanation

Question 5 of 20

Circulators with internal spring-load check valves installed in vertical piping with upward flow are especially susceptible to air pockets.

Select one of the following:

Explanation

Question 6 of 20

Although water may appear perfectly clear and free of bubbles, it can still contain a significant quantity of air in solution.

Select one of the following:

Explanation

Question 7 of 20

Combined air and dirt separators, or a hydraulic separator with the same capabilities, are never desirable in situations where an older distribution system containing steel or iron piping or radiators will be interfaced to a new boiler.

Select one of the following:

Explanation

Question 8 of 20

Properly designed and installed hydronic systems will always require constant manual air venting.

Select one of the following:

Explanation

Question 9 of 20

Low system pressurization is usually caused by not setting the make-up water system properly.

Select one of the following:

Explanation

Question 10 of 20

Glycol-based antifreezes tend to leave a slippery film on components and tools that eventually turn sticky.

Select one of the following:

Explanation

Question 11 of 20

Flow noise is generated when dissolved gases are released from improperly deaerated fluid due to a __________ in pressure.

Select one of the following:

Explanation

Question 12 of 20

Air contains oxygen, and oxygen in contact with ferrous metals creates __________.

Select one of the following:

Explanation

Question 13 of 20

A large pocket of air trapped within a system can totally stop flow. This effect is often called air _________.

Select one of the following:

Explanation

Question 14 of 20

Dissolved air can also lead to gaseous cavitation. Gaseous cavitation occurs when the pressure on the fluid __________ the saturation pressure of the dissolved gases it contains.

Select one of the following:

Explanation

Question 15 of 20

When air exists as bubbles, a moving fluid may be able to carry them along through the system. This is called __________ air.

Select one of the following:

Explanation

Question 16 of 20

The air removal devices used in small hydronic systems can be classified as either high point vents or __________.

Select one of the following:

Explanation

Question 17 of 20

The need for fully automatic (unattended) venting in locations not easily accessed requires a different type of device. A(n) __________ air vent often provided the solution.

Select one of the following:

Explanation

Question 18 of 20

A(n) __________ is capable of maintaining the system fluid in an unsaturated state of air solubility. This means that the water is always ready to absorb additional air from any areas of the system where it may be present.

Select one of the following:

Explanation

Question 19 of 20

A device that makes short work out of filling and purging residential and light commercial hydronic systems consists of a minimum 1-horsepower swimming pool pump mounted on a 30-gallon plastic trash barrel. This device is called a(n) __________.

Select one of the following:

Explanation

Question 20 of 20

An automatic fluid feeder uses a small positive displacement pump operated by a pressure sensing switch to automatically pump fluid into the system when the pressure __________ a set minimum value.