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Unformatted text preview: Muhammad Irfan Yousuf (Peon of Holy Prophet (P.B.U.H)) 2000E41 1 Conventions for Describing Networks 21. For the controlled (monitored) source shown in the figure, prepare a plot similar to that given in Fig. 28(b). v 2 v 1 = V b V b v 1 = V a V a i 2 Fig. 28 (b) Solution: Open your book &amp; see the figure (P/46) It is voltage controlled current source. i 2 +Ve axis v 2Ve axis gv 1 i 2 gv 1 + v 2 current source Muhammad Irfan Yousuf (Peon of Holy Prophet (P.B.U.H)) 2000E41 2 22. Repeat Prob. 21 for the controlled source given in the accompanying figure. Solution: Open your book &amp; see the figure (P/46) It is current controlled voltage source. v 2 ri 1 i 2 23. The network of the accompanying figure is a model for a battery of opencircuit terminal voltage V and internal resistance R b . For this network, plot i as a function v. Identify features of the plot such as slopes, intercepts, and so on. Solution: Open your book &amp; see the figure (P/46) Terminal voltage v = V  iR b iR b = V  v i = (V  v )/R b When v = 0 i = (V  v )/R b i = (V  0 )/R b i = V/R b amp When v = V i = (V  V )/R b i = (0 )/R b i = 0 amp v = 0 i = V/R v = V i = 0 i V/R b V v Slope: Muhammad Irfan Yousuf (Peon of Holy Prophet (P.B.U.H)) 2000E41 3 y = mx + c (x 1 , y 1 ) = (0, V/R b ) (x 2 , y 2 ) = (V, 0) m = (y 2 y 1 )/(x 2 x 1 ) = (0 V/R b )/(V  0) = (V/R b )/V = (V/Rb)(1/V) = 1/R b yintercept = V/R b xintercept = V Slope yintercept xintercept1/R b V/R b V 24. The magnetic system shown in the figure has three windings marked 11, 22, and 33. Using three different forms of dots, establish polarity markings for these windings. Solution: Open your book &amp; see the figure (P/46) Lets assume current in coil 11 has direction up at 1 (increasing). It produces flux (increasing) in that core in clockwise direction. 1 1 2 2 3 3 According to the Lenzs law current produced in coil 22 is in such a direction that it opposes the increasing flux . So direction of current in 22 is down at 2. Hence ends 1 &amp; 2 are of same polarity at any instant. Hence are marked with . Similarly assuming the direction of current in coil 22, we can show at any instant 2 &amp; 3 have same polarities and also 1 &amp; 3 have same polarities. 25. Place three windings on the core shown for Prob. 24 with winding senses selected such that the following terminals have the same mark: (a) 1 and 2, 2 and 3, 3 and 1, (b) 1 and 2, 2 and 3, 3 and 1. Solution: Open your book &amp; see the figure (P/47) Muhammad Irfan Yousuf (Peon of Holy Prophet (P.B.U.H)) 2000E41 4 1 1 2 2 3 3 (a) 1 1 2 2 3 3 (b) 26. The figure shows four windings on a magnetic fluxconducting core. Using different shaped dots, establish polarity markings for the windings....
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 Spring '07
 Chang
 Voltage source, Current Source, Muhammad Irfan Yousuf

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