Questão 1
Questão
Hydronic heating systems should never use a combination of flexible and rigid piping materials.
Questão 2
Questão
In the absence of any building or mechanical codes that require otherwise, type M is the standard for copper tubing used in hydronic heating systems.
Questão 3
Questão
Plumbing codes no longer allow solders containing lead to be used for domestic water service.
Questão 4
Questão
The molecular structure of nonmetallic tubes such as those made of PEX or rubber compounds is such that oxygen molecules can diffuse through their tube walls and be absorbed by the fluid within.
Questão 5
Questão
The pressure difference between the inside and outside of the tube has a very strong effect on oxygen diffusion.
Questão 6
Questão
A well-planned piping assembly will use the largest number of fittings possible.
Questão 7
Questão
Due to thermal expansion, the greater the length of the pipe, and the greater the temperature change, the greater the change in length.
Questão 8
Questão
A feed water valve is used to increase the pressure of water from a domestic water distribution pipe before it enters a hydronic system.
Questão 9
Questão
Piping schematics are the road maps of hydronic system design. Unfortunately, there is no universal standard for piping symbols to which all those in the hydronics industry subscribes.
Questão 10
Questão
In situations where both piping and electrical wiring are in close proximity, try to keep the piping above the electrical wiring.
Questão 11
Questão
In situations where good heat transfer through the walls of the pipe is desirable, __________ is unsurpassed.
Questão 12
Questão
Copper water tube is available in three wall thicknesses designated as types __________ in order of decreasing wall thickness.
Responda
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A, B, and C
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S, M, and L
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K, L, and M
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1, 2, and 3
Questão 13
Questão
Copper tubing must be properly supported to prevent sagging or buckling. On horizontal runs of hard temper tubing, the maximum support spacing for 1/2- and 3/4-inch tube is __________ feet.
Questão 14
Questão
In situations where several runs of piping and/or electrical conduit must be run in close proximity, a __________ system is a good option.
Responda
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mounting rail
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rubber liner
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horizontal piping
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vertical piping
Questão 15
Questão
Fittings for copper tubing are available in either wrought copper or __________.
Responda
-
stainless steel
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PEX
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tempered rubber
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cast brass
Questão 16
Questão
When long straight runs of rigid tubing are required, it may be necessary to install an expansion loop or an expansion offset to absorb the movement. Another alternative is to install an expansion __________ capable of absorbing the movement.
Responda
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regulator
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compensator
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barometer
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overflow
Questão 17
Questão
Feed water valves operate by balancing the force generated by water pressure against an internal flexible __________, with the counterforce generated by a partially compressed spring.
Responda
-
feeder
-
cavitator
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diaphragm
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pressurizer
Questão 18
Questão
Hydronic heating systems, once assembled, must be filled, purged of air, and filled with fluid. A(n) __________ is specifically designed for this purpose.
Responda
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purging valve
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air deactivator valve
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ball valve assembly
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flow regulator valve
Questão 19
Questão
If the inlet pressure on the backflow preventer drops below the pressure in the hydronic system, springs return both check valves and the movable cartridge to their __________ positions.
Responda
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open
-
closed
-
original
-
preset
Questão 20
Questão
Another specialty valve widely used in hydronic systems provides the ability to isolate, flow balance, and even drain individual heat emitters. It is called a __________.