1. A 12' hollow tungsten rod has a cross-sectional area illustrated below. At 150°C, the resistance of the rod is known to be 175 µs. Take ow@20°c = 0.1786x10³ Siemens/m, aw@100°c = 0.003311258278 per °C, and the outer radius of the cross-sectional area as 1.25". Determine the following: a. The inferred absolute temperature of tungsten in °C b. The resistivity of tungsten at 120°C in Q2-CM/ft c. The area occupied by the tungsten in square mils d. The length in inches of the side of the regular octagon comprising the hollow region of the cross-sectional area e. The resistance at 80°C of a solid copper rod having the same length as that of the tungsten rod, and a circular cross-sectional area that can fit tightly inside the hollow octagonal region of the tungsten rod without deformation on both rods. Take pcu@20°c = 10.37 92-CM/ft, acu@20°c = 0.003929273084 per °C. Assume both tungsten and copper rod does not expand nor stretch with the increase in temperature. X
1. A 12' hollow tungsten rod has a cross-sectional area illustrated below. At 150°C, the resistance of the rod is known to be 175 µs. Take ow@20°c = 0.1786x10³ Siemens/m, aw@100°c = 0.003311258278 per °C, and the outer radius of the cross-sectional area as 1.25". Determine the following: a. The inferred absolute temperature of tungsten in °C b. The resistivity of tungsten at 120°C in Q2-CM/ft c. The area occupied by the tungsten in square mils d. The length in inches of the side of the regular octagon comprising the hollow region of the cross-sectional area e. The resistance at 80°C of a solid copper rod having the same length as that of the tungsten rod, and a circular cross-sectional area that can fit tightly inside the hollow octagonal region of the tungsten rod without deformation on both rods. Take pcu@20°c = 10.37 92-CM/ft, acu@20°c = 0.003929273084 per °C. Assume both tungsten and copper rod does not expand nor stretch with the increase in temperature. X
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Transcribed Image Text:1. A 12' hollow tungsten rod has a cross-sectional area illustrated below. At 150°C, the resistance of the rod is
known to be 175 µSN. Take owa2orc = 0.1786x10° Siemens/m, aw@100°c = 0.003311258278 per °C, and the outer
radius of the cross-sectional area as 1.25". Determine the following:
a. The inferred absolute temperature of tungsten in °C
b. The resistivity of tungsten at 120°C in 2-CM/ft
c. The area occupied by the tungsten in square mils
d. The length in inches of the side of the regular octagon comprising the hollow region of the cross-sectional
с.
area
e. The resistance at 80°C of a solid copper rod having the same length as that of the tungsten rod, and a circular
cross-sectional area that can fit tightly inside the hollow octagonal region of the tungsten rod without
deformation on both rods. Take pcu@20c = 10.37 Q-CM/ft, acu@20°c = 0.003929273084 per °C.
Assume both tungsten and copper rod does not expand nor stretch with the increase in temperature.
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