the steel of the third rail (means the center or the overhead rail for power) of a railway system has a resistivity of 21.4 microhm-CM. if the cross-sectional area is 8.2 square-inches, calculate the resistance per mile of rail, neglecting the joints between sections.

Pls, answer no.1 and 2 (show the complete solution and round off final answers to 4th decimal) (write properly pls)

A silver conductor has a resistance of 25 Ω at 0 ˚C. Determine the temperature coefficient of resistance at 0 ˚C and the resistance at -30 ˚C.

A cable is tested by loss of charge Method using a Ballistic galvanometer with following results : Discharged immediately after electrification deflection 200 divisions. Discharged after 30 second and after electrification (i) Deflection 126 divisions (ii) When in parallel with a resistance of 10 V deflection 100 divisions. Calculate the insulation resistance of the cable.

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be(A) 160 ohms(B) 80 ohms(C) 20 ohms(D) 10 ohms

A conductor has a size of 500 MCM, what will be its size in square m?

An aluminium rod with square cross section is 1.3 m long and 3.8 mm on edge ) What is the resistance between its ends? The resistivity of aluminium is 2.75 - 10-8 Q.m. (ii) What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminium rod? The resistivity of copper is 1.69 * 10-8 Q.m. (iii) Calculate the current (in A) and the current density (in A/m^2) of the cylindrical copper if the potential drop across the ends of the wire is 0.060 V. Select one: a. (i) 3.27 x 10-30 (ii) 15.3 × 10-3 m (iii) l= 18.3 A and J=1 x 105 A/m2 b. (i) 2.50 x 10-3n (i) 3.4 × 10-3 m (iii) l= 24 A and J=2.64 x 10 A/m2 c. (i) 2.50 x 10-3 (ii) 3.4 x 10-3 m (iii) l= 24 A and J=2.08 x 106 A/m2 d. (i) 3.27 x 10-3 (ii) 8.14 x 10-3 m (iii) l= 18.3 A and J=2.64 x 106 A/m2

An aluminum wire has a diameter of 2 mm. What must be the diameter of copper wire of the same resistance and length as aluminum? A. 1.33 mm B. 1.45 mm C. 1.56 mm D. 1.75 mm

1-Which type of power supply is required to power up a LVDT? does not matter AC no power supply required DC 2- In a flat-film strain gage having a rectangular cross section, if the thickness of the film is reduced by 20%, while all other parameters are kept constant, what is the ratio of the new resistance to the old resistance value?

i) Calculate V1 and V2 for the voltage across the string insulator having phase voltage of 33kV for transmission line using details tabulated in the Table 3(a). Table 3(a) Type of Insulator Shunt Capacitance between each unit 0.1 C String to junction Self -Capacitance of each insulator ii) With the help of a suitable schematic diagram and necessary theoretical explanation, illustrate how to improve the efficiency of the suspension insulator.