1. A 2-wire d.c. distributor A B is fed at both ends at the same voltage of 230 V. The length of the distributor is 500 metres and the loads are tapped off from the end A as shown below : Load : Distance : If the maximum voltage drop of 5:5 V is to be allowed, find the X-sectional area of each conductor and point of minimum potential. Specific resistance of conductor material may be taken as 1:73 × 10Q..| 100 A 60 A 40 A 100 A 250 m 400 m 50 m 150 m [1-06 cm ; 250 m from A]

a wind turbine converts wind energy to electrical energy if the turbine reads 1000 J of wind energy to a single day the amount of electricity produced in the same time. Would be A greater than 1000 j because the efficiency is 120% B greater than 1000 J because electrical energy is higher quality than wind energy C equal to 1000 j because energy cannot be created or destroyed

2. A bank of nickel-cadmium cells is used as the emergency lighting supply for a hospital. There are 100 cells connected in series and each has an A-hr rating of 120 A-hr. The bank has to be replaced, and the manufacturer is no longer supplying nickel-cadmium cells. It is decided to replace the cells with lead-acid cells. How many lead-acid cells will be required if each has an A-hr rating of 60 A-hr, and how should they be connected?

For the Zener diode network of Fig. 1 Determine VL, VR, R and PZAssume that the Zener diode is in the “ON" stateWhere: VL = VZ & R = 9375Ω