Materials used in the construction of RTDs include platinum, nickel, and copper; platinum being the most commonly used.In above 4 arguments,3rd one which says instability of electrical characteristics.In actual we need good(stable)electrical characteristics.So option C
Which is not a requirement for RTD material? High temperature coefficient and High resistivity to ensure...
The temperature coefficient of resistivity of a material is 0.0036 (C°)-1. By how much ΔT does the temperature of a wire made from this material have to change, in order that the resistance of the wire doubles?
The temperature coefficient of resistivity of a material is 0.0049 (C°)-1. By how much ΔT does the temperature of a wire made from this material have to change, in order that the resistance of the wire doubles?
The temperature coefficient of resistance α in equation R(T)=R0[1+α(T−T0)] equals the temperature coefficient of resistivity α in equation ρ(T)=ρ0[1+α(T−T0)] only if the coefficient of thermal expansion is small. A cylindrical column of mercury is in a vertical glass tube. At 20 ∘C, the length of the mercury column is 12.0 cm. The diameter of the mercury column is 1.6 mm and doesn't change with temperature because glass has a small coefficient of thermal expansion. The coefficient of volume expansion of...
Learning Goal: Examine the dependence of resistivity and resistance of a wire on temperature and how it affects the potential difference across the terminals of the wire. Introduction: A current of 65 milli-amperes (mA) flows through a wire of length L= 1.7 meters long and diameter of d= 1.15 millimeters at a temperature of T0= 20 °C; the wire's resistivity at this temperature is ρ0= 5.33×10−8 Ω ∙ m. The temperature coefficient of resistivity of the material is α= 4.6×10−3/C°....
It is possible to crudely determine the resistivity of a material using the following equipment and materials. Five coils of wire all made of the same unknown metal can be produced with characteristics shown in the table below. In addition to each coil being made of the same metal, each coil is wound using 10 meters of wire. The difference between each coil is the diameter of wire. Coil characteristics Length Coil Number Gauge (AWG) Diameter (mm) (m) 10 2.58826...
Copper wire has a resistivity ρ =1.7 x 10-8 Ω·m when at 20°C and it has a temperature coefficient α = 3.9×10-3 K-1. A solid cylinder of copper of length L = 55 cm and diameter D = 2.5 mm has one end held at T1 = 0℃ and the other end is held at T2 =220 ℃. The temperature increases linearly between the two ends of the cylinder. Part (a) Consider a thin slice of the copper cylinder of thickness...
ur thhe spécific for shear, u, and the specific heat of the material. Hence, temperature risc ene machining materials with high strengt cates. The temperature rise at the tool-chip interface is, of course, also a fiu cocfficient of friction. Flank wear (see Section 8.3 and Fig. 8.20a) isction of source of heat, caused by rubbing of the tool on the machined surface. those of the workpiece. generated in the shear plane is a functioll UI material. Hence, temperature rise is...
Q21. Which one of the following statements about the ductility of metals is TRUE? A High ductility occurs in brittle materials B Ductility is the amount of deformation at the 0.2% proof stress C Ductility can be measured as % reduction in area from broken tensile samples D Ductility is deformation in the elastic region E Ductility is the change between upper and lower yield point in steels Q22. Which one of the following statements is TRUE about Charpy impact...
7) Which of the following is true? O The linear coefficient of thermal expansion is unique for each material (material property) O The displacement due to temperature is linearly related to the original length O Stress concentration factors relate the maximum stress to the average stress O Sharp corners should be avoided because they create stress concentrations. O All the above are true 8) Which of the following statements are true? O A simply supported beam which supports a load...
(a) Which part of an atom is positively charged, and which part is negatively charged? (b) How does the charge of an electron compare with the charge of another electron? (c) How does the charge of an electron compare with the charge of a proton? Can charge be created or destroyed? How does that answer relate to the conservation of charge? How is electric charge similar to mass? How are they different? What are two ways electric charge can be...