Questão 1
Questão
One of the most important properties of water relevant to its use in hydronic systems is specific heat.
Questão 2
Questão
If the material changes phase while absorbing heat, its temperature will change.
Questão 3
Questão
The specific heat of water is high in comparison to other common materials. In fact, water has one of the highest specific heats of any known material.
Questão 4
Questão
The difference in heat capacity of water versus that of air is the single greatest advantage of using water rather than air to convey heat.
Questão 5
Questão
The density of water is not dependent on temperature.
Questão 6
Questão
It is often necessary to determine the quantity of heat stored in a given amount of material that undergoes a specific temperature change. An equation known as the sensible heat quantity equation, can be used for this purpose.
Questão 7
Questão
The quantity of heat absorbed or released from the material is expressed as Btu/hr.
Questão 8
Questão
The rate of heat transfer into or out of the fluid stream in equations is expressed as Btu.
Questão 9
Questão
The vapor pressure of a liquid is the minimum pressure that must be applied at the liquid's surface to prevent it from boiling.
Questão 10
Questão
When hydronic systems are first filled with water, dissolved air is present in the water throughout the system.
Questão 11
Questão
The heat absorbed or released by a material while it remains in a single phase is called __________ heat.
Responda
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radiant
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sensible
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ambient
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latent
Questão 12
Questão
If the material changes phase while absorbing heat, its temperature does not change. The heat absorbed in such a process is called ________ heat.
Responda
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radiant
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sensible
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ambient
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latent
Questão 13
Questão
Although it is not a defined scientific term, it could be said that water is almost _________ times more "thermally concentrated" than air.
Questão 14
Questão
Hydronic system designers often need to know the __________ of heat transfer to or from a stream of water flowing through a device such as a heat source or heat emitter.
Responda
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rate
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temperature
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thermal mass
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exact volume
Questão 15
Questão
The ___________ pressure of a liquid is the minimum pressure that must be applied at the liquid's surface to prevent it from boiling.
Responda
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surface
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mean
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vapor
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systemic
Questão 16
Questão
The viscosity of a fluid is an indicator of its resistance to __________.
Responda
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flow
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heat
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combining
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displacement
Questão 17
Questão
The amount of air that can exist in solution with water is strongly dependent on the water's temperature. As water is heated, its ability to hold air in solution __________.
Responda
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rapidly increases
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remains constant
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is viscosity dependent
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rapidly decreases
Questão 18
Questão
When a quantity of liquid water is put under pressure, there is __________ change in its volume.
Responda
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a significant
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very little
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a corresponding
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a formulaic
Questão 19
Questão
The total liquid flow rate entering any portion of a fluid-filled (non-leaking) piping assembly will __________ the total flow rate exiting that assembly.
Responda
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always equal
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never equal
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might equal
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approximate
Questão 20
Questão
Incompressibility implies that liquids can exert tremendous pressure in any type of filled and closed container when they __________ due to heating.
Responda
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contract
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dissolve
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expand
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vaporize