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Chapter 13 - Quiz
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Questions in this quiz (20)
1If properly designed, a closed-loop hydronic system should rid itself of most air within a few days of initial start-up.
- ATrue
- BFalse
2The oxygen that causes corrosion is the same oxygen that forms water molecules.
- ATrue
- BFalse
3Circulators transfer maximum head energy to incompressible fluids (e.g., liquids). A mixture of water and air is an example of an incompressible fluid.
- ATrue
- BFalse
4Air has much lower specific heat and density than water.
- ATrue
- BFalse
5Circulators with internal spring-load check valves installed in vertical piping with upward flow are especially susceptible to air pockets.
- ATrue
- BFalse
6Although water may appear perfectly clear and free of bubbles, it can still contain a significant quantity of air in solution.
- ATrue
- BFalse
7Combined 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.
- ATrue
- BFalse
8Properly designed and installed hydronic systems will always require constant manual air venting.
- ATrue
- BFalse
9Low system pressurization is usually caused by not setting the make-up water system properly.
- ATrue
- BFalse
10Glycol-based antifreezes tend to leave a slippery film on components and tools that eventually turn sticky.
- ATrue
- BFalse
11Flow noise is generated when dissolved gases are released from improperly deaerated fluid due to a __________ in pressure.
- Aincrease
- Bmodulation
- Cequalization
- Dreduction
12Air contains oxygen, and oxygen in contact with ferrous metals creates __________.
- Aoxides
- Bantigens
- Cbubbles
- Ddeaeration
13A large pocket of air trapped within a system can totally stop flow. This effect is often called air _________.
- Ablockage
- Bplugging
- Cbinding
- Dtrapping
14Dissolved 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.
- Aequals
- Bdrops below
- Crises above
- Dis double
15When air exists as bubbles, a moving fluid may be able to carry them along through the system. This is called __________ air.
- Aentrained
- Bfluid
- Cdeaerated
- Dbubbly
16The air removal devices used in small hydronic systems can be classified as either high point vents or __________.
- A"bleeders"
- Bcentral air separators
- C"coin vents"
- Ddeaerators
17The 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.
- Aelectronic
- Btop-loaded
- Cergonomic
- Dfloat-type
18A(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.
- Aair purger
- Bcoalescing media
- Cmicrobubble air separator
- Dhygroscopic air vent
19A 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) __________.
- Acirculator
- Bpurge cart
- Cair scooper
- Ddeaerator
20An 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.
- Areaches
- Bdrops below
- Cexceeds
- Dis stored at
Information
- Description
- Air Removal, Filling, and Purging
- Author
- Neil Revollo
- Language
- English
- Views
- 207
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