Download Electric Circuit Problems with Solutions by F. A. Benson D.Eng., Ph.D., F.I.E.E., Sen.M.I.E.E., PDF
By F. A. Benson D.Eng., Ph.D., F.I.E.E., Sen.M.I.E.E., F.Illum.E.S. (auth.)
Electrical-engineering and electronic-engineering scholars have usually to solve and simplify really advanced circuits which will comprehend them or to acquire numerical effects and a legitimate wisdom of uncomplicated circuit thought is accordingly crucial. the writer is particularly a lot in favour of tutorials and the fixing of difficulties as a mode of schooling. event exhibits that many engineering scholars come upon problems once they first practice their theoretical wisdom to useful difficulties. Over a interval of approximately 20 years the writer has amassed various difficulties on electrical circuits whereas giving lectures to scholars attending the 1st post-intermediate years of Uni versity engineering classes. the aim of this publication is to provide those difficulties (a overall of 365) including many suggestions (some difficulties, with solutions, given on the finish of every bankruptcy, are left as scholar workouts) within the wish that they are going to turn out of price to different lecturers and scholars. recommendations are separated from the issues in order that they should not visible unintentionally. the answer's given on the finish of every challenge, although, for comfort. components of the booklet are in keeping with the author's past paintings electric Engineering issues of ideas which was once released in 1954.
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Ans. 100 f'F; 0'50] + 219. Find the parallel combination of resistance and capacitance which takes the same current at the same power-factor from a 50-Hz supply as an impedance of (17·3 - jto)O. Would these circuits be equivalent at a different value of frequency? [Ans. ] 220. Two voltage sources, Vi = 100(1 - j) and V2 = 100(1 + j) volts, of internal impedance Zi = 30(1 + j) and Z2 = 50(1 + }O) ohms, respectively, are connected in parallel across an impedance of Z3 = 20(1 + j5) ohms. Determine the magnitude of the current in Z3 and its phase relationship to V2 • [Ans.
B + ;J 76. Points A, B, C, D are joined by five wires AB, BC, CD, DA and BD. The resistances ofthese wires are respectively 5,5,5,3 and 8 o. Find the equivalent resistance of the network for a current entering at A and leaving at C. [Ans. (4th) 0] 77. Two long straight parallel wires are joined by cross wires of the same material at equal distances, forming an infinite ladder of equal squares, the resistance of a side of a square being r. A current enters and leaves the network at the ends P and Q of one of the cross wires.
Lon loon lOon looon 90n looon lon lOon lon : 100V _1- [Ans. 2·16 V and 10620; 2·03 rnA] 2S PROBLEMS 79-83 79. Use Thevenin's Theorem and the Principle of Superposition to find the current in the 4-0 resistor in the network illustrated. n lA [Ans. 0·21 A] 80. A two-wire distributor 1000 m long has the following loads: Distance from feed (m) 100 300 500 700 1000 Load (A) 20 30 40 20 40 30 The feed is at 240 V and the end consumer is to receive at 220 V. Show that the cross-sectional area of the copper distributor must be 166 mm 2• The resistivity of copper is 1·7 x 10 Om.