5. A 2-wire DC ring distributor is 375m long and is fed with 300V at point A. At point B, 200m from A, load of 150A is taken and at point C, 100m in the opposite direction, a load of 100A is taken. If the resistance per 100m of single conductor is 0.03, find: i. Current in each section of distributor ii. Voltage at points B and C iii. Point of minimum potential

Which of the following statement is true? a. 2 wire ac distribution line has only resistance . b. 2 wire ac distribution line has only capacitive reactance.. c. 2 wire ac distribution line has inductive reactance. d. 2 wire ac distribution line has doesn't have any inductive reactance.

A 650 m, 2-wire d.c. distributor fed from one end is loaded uniformly at the rateof 1-6 A/metre. The resistance of each conductor is 0.0456 ohm per metre. Find the voltage necessary at feed point to maintain 240 V (i) at the far end (ii) at the mid-point of the distributor.

A two-core feeder 138 kilo meter long supplies a maximum current of 142 A at 400 volts. The demand is such that the copper loss per annum is that which would be produced by the full load current flowing for 4 months. The resistance of conductor 1 km long and 1mm2 section of conductor as 0.0371 ohm. The value of area of cross section is 120 mm2. The cost of energy is 15 baisa per unit. Find the power loss and Annual cost. Power Loss = kW Annual cost = Rial

7. TY Hat CHICL Ans. 1. Iron los.........varies approximately as V². 2. Cu loss..........it also varies as ² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa. quems

(b) A symmetrical three-wire three-phase supply as shown in Figure Q2(b) is connected to a balanced three-phase load. The value of impedance, Z is identified to be 100-j75 Q. (i) Find IaB, IBC and ICa (ii) Determine Iaa, IbB and Ic (iii) Determine Iba, Isb and Ix (iv) Draw the phasor diagram of all currents in Q(b)(i) and Q(b)(ii)

what is the introduction for MEASUREMENT USING DC BRIDGES

Problem#6 A 2-wire DC distributor AB 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. 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 x 10-8 S2 m. 60 A 40 A 150 m 250 m Load: Distance: 100 A 50 m 100 A 400 m

3. The resistance of a conductor having length 1 area of cross section a and resistivity p is given as: a. pa/l b. pl/a c. pla d. /p

Iron material is used for the design of Fuse Select one: True False