1. What should be the minimum cross-sectional area of each conductor in a two-core cable 100 m long to limit the total voltage drop to 4% of the declared voltage of 250V when the conductors carry 60A? The resistivity of the conductor is 2.845 μ cm. [0.34 cm²] 2. A 2-wire d.c. distributor, 500 m long is fed at one of its ends. The cross-sectional area of each conductor is 3-4 cm² and the resistivity of copper is 1.7 µcm. The distributor supplies 200 A at a distance of 300m from the feeding point and 100 A at the terminus. Calculate the voltage at the feeding end if the voltage at the terminus is to be 230 V. [241 V] 3. A 2-wire d.c. distributor AB 500 metres long is fed from point A and is loaded as under: Distance from feeding point A (in metres) Load (amperes) 100 20 300 40 400 500 40 50 If the specific resistance of copper is 1.7×10 Qm, what must be the cross-section of each wire in order that the voltage drop in the distributor shall not exceed 10 volts ? [1.734 cm²]