State Kalvin’s law and its limitations
[3 marks]Compere A.C. transmission with D.C. transmission
[4 marks]What are the advantages of keeping high transmission Vvoollttaaggee. voltage is
[7 marks]Explain Ferranti effect.
[3 marks]Distinguish between Feeder, Distributer, Service mains. What is the criteria used for design each of them?
[4 marks]What is the percentage saving in feeder copper if the line voltage in two wire D.C. system be raised from 220V to 500V for the same power to be transmitted?
[7 marks]Find the ratio of volume of copper required to given power over a given distance by overhead system using (i) d.c. 2 wire system (ii) 3 phase 3 wire system (iii) 2-phase 3 wire system.
[7 marks]What is effect of earth on transmission line
[3 marks]What do you mean by transposition of line? What is its effect on performance of line?
[4 marks]Drive the equation of inductance for three phase line with symmetrical spacing.
[7 marks]What is the advantage of per unit system?
[3 marks]Explain skin effect and proximity effect.
[4 marks]Drives from basic consideration an expression of the capacitance and charging current per k.m. length of a single phase line made of two solid round conductor of radius r and spaced at Dmeters. Neglect the effect of ground.
[7 marks]Explain the primary and secondary distribution with single line diagram.
[3 marks]List out line support with its features.
[4 marks]Two conductor of street mains AB is 500 meters long fed from both e ends at 250V. Loads of 50A, 60A, 40A and 30A are tapped at the distance of 100m, 250m, 350m, 400m from A. If the cross- section of the conductor be 1cm2 and specific resistance of material of the conductor is 1.7micro ohm-cm .Determine the minimum consumer voltage.
[7 marks]What is the difference between radial, ring man and interconnected system of distribution?
[3 marks]Discuss briefly design consideration of distribution system
[4 marks]Atwo wire feeder ABC has a load of 120A at Cand 60A at Bboth at power factor 0.8 lagging. The impedance AB is (0.04+j0.08)1 and that of BC is (0.08+j0.12) ohm. If the voltage at far end Cis to be maintained at 400V, determine the voltages (i) at A (ii)at B.
[7 marks]Give the classification of cable based on voltage
[3 marks]What are A.C.S.R. conductor and why they are preferred over copper conductor for overhead transmission.
[4 marks]Draw a neat sketch of the cross section of a 3-core belted high voltage cable and describe its various part.
[7 marks]What do you mean by capacitance grading of cable.
[3 marks]Name the different component of transmission line. Also explain purpose for they are used.
[4 marks]Explain in detail method of improving string efficiency.
[7 marks]