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romanna [79]
3 years ago
7

A eutectic alloy is which of the following (two correct answers): (a) the composition in an alloy system at which the two elemen

ts are present in equal proportions, (b) the composition in an alloy system for which the solidus and liquidus are at different temperatures, (c) the composition in an alloy system for which the solidus and liquidus are at the same temperature, (d) the composition in an alloy system that has the highest melting point, and (e) the composition in an alloy system that has the lowest melting point?
Engineering
1 answer:
NeTakaya3 years ago
3 0

Answer:

Option (c) and option (d)

Explanation:

Eutectic system is one in which a solid and homogeneous mixture of two or more substances resulting in the formation of super lattice is formed which can melt or solidify at a temperature lower than the melting point of any individual metal.

Eutectic alloys are those which have its components mixed in a specific ratio.

It is the composition in an alloy system for which both the  liquidus and solidus temperatures are equal.

Eutectic alloys have the composition in which the melting point of the metal is lower than the other alloy composition.

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The ice on the rear window of an automobile is defrosted by attaching a thin, transparent, film type heating element to its inne
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Answer:

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B)K = 0.138 W/m.K

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outside air temperature;T_∞,o = -10°C = - 10 + 273 = 263K

Inner surface temperature;T_s,i = 15 °C = 15 + 273 = 288K

Thickness, L = 4mm = 0.004m

convection heat transfer coefficient ; hi = 25 W/(m².K)

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Q = [(T_s,i - T_∞,o)/((L/k) + (1/hi))] - [(T_∞,o - T_s,i)/(1/hi)]

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B) The formula for thermal conductivity is;

K = (QL)/(AΔT)

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K is the thermal conductivity in W/m.K

Q is the amount of heat transferred through the material

L is the distance between the two isothermal planes

A is the area of the surface in square meters

ΔT is the difference in temperature in Kelvin

ΔT = 298K - 263K = 35K

Now, since we have value of heat per unit area to be Q = 1208.33 W/m², let's rearrange the equation to reflect that; Thus ;

k = (Q/A) x (L/ΔT)

K = 1208.33 x (0.004/35)

K = 0.138 W/m.K

5 0
3 years ago
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