Test
Chapter 12 - Quiz
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Preguntas del test (20)
1In systems that are open to the atmosphere, such as a non-pressurized thermal storage tank, the volume increase of heated fluid is accommodated by an expansion tank.
- AVerdadero
- BFalso
2One inherent problem with standard expansion tanks is that the air and water they contain are in direct contact.
- AVerdadero
- BFalso
3The air in a standard expansion tank is initially at atmospheric pressure.
- AVerdadero
- BFalso
4Standard expansion tanks typically need to be drained and refilled with air at least once each year.
- AVerdadero
- BFalso
5Many of the shortcomings of standard expansion tanks can be avoided by separating the air and water in an expansion tank.
- AVerdadero
- BFalso
6The entire volume of system fluid reaches the maximum fluid temperature simultaneously.
- AVerdadero
- BFalso
7Most modern diaphragm-type tanks use a butyl rubber or EPDM diaphragm.
- AVerdadero
- BFalso
8It is good practice to install a pressure-regulator valve near the inlet of any expansion tank.
- AVerdadero
- BFalso
9The expansion tank should always be connected to the system near the outlet port of the circulator.
- AVerdadero
- BFalso
10Many systems with chronic "air problems" can be corrected by simply rearranging the piping so that the circulator pumps away from the point of no pressure change.
- AVerdadero
- BFalso
11In a typical closed-loop hydronic system, the extra space caused by heated liquid is usually provided by a separate chamber called the expansion tank. This tank contains a volume of __________ that is compressed.
- Aair
- Bgas
- Cwater
- Dsludge
12A software module called Expansion Tank Sizer in the Hydronics Design Studio software is an aid for determining tank size and __________.
- Aplacement
- Bpressurization
- Ctype
- Dbrand
13When __________ occurs, there is no longer a cushion of air for the system's water to expand against.
- Awaterlogging
- Bdeaeration
- Cthermal shutdown
- Dhydraulic separation
14The static pressure at the expansion tank connection when the system is filled is based on the height of the system piping above the expansion tank, the type of fluid used, and a customary allowance for __________ psi pressure at the top of the system for proper operation of the air vents.
- A1.5
- B3.33
- C5.0
- D7.5
15In a diaphragm-type expansion tank, since the diaphragm separates the fluid from the air, the air __________ the fluid.
- Acools
- Beasily combines with
- Cis proportional to
- Dcannot be reabsorbed by
16A properly sized diaphragm-type expansion tank allows the pressure relief valve to reach a pressure of about __________ psi lower than its rated opening pressure when the system reaches its maximum operating temperature.
- A1.25
- B3.33
- C5.0
- D6.66
17Expansion tanks have maximum pressure and temperature ratings. This information is stamped on the label of the tank. Typical ratings are __________ psi and 240ºF.
- A5.0
- B60.0
- C25.0
- D86.0
18The __________ fixes the pressure of the system's fluid at its point of attachment to the piping. This is called the point of no pressure change.
- Acirculator
- Bheat emitter
- Cexpansion tank
- Ddiaphragm
19When __________ circulators are used, the header they connect to should be located close to and just downstream from the point where the expansion tank is connected.
- Amultiple zone
- Bvariable speed
- Chydraulic
- Dsingle zone
20It is __________ to install two or more expansion tanks at different locations within a system.
- Astandard procedure
- Ba manufacturer's recommendation
- Cnot advisable
- Dthe user's requirement
Información
- Descripción
- Expansion Tanks
- Autor
- Neil Revollo
- Idioma
- English
- Visitas
- 402
- Etiquetas
- Valoración
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