University of Mumbai 2009-3rd Sem B.E Electrical and Electronics Engineering Electrical Networks Old - Question Paper
Electrical Networks Old Course Sem III June 2009
(2) Attempt any four questions out or remaining six questions.
(3) Figures to the right indicate full marks. ___3
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(4) Assume suitfthlfiand state them. v > j
1. (a; Find the Tnevemn's equivalent across a and b.
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(b) (i) Write short note on initial conditions. 5
(ii) Find the current in a series RL circuit, having R = 2 O, L = 10H, while a 5 * dc voltage of 100 V is applied. Find the value of current after 5 seconds of switching on.
2. (a) Use mesh analysis to fin<j power supplied by dependent voltage source. 10
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(b) Determine whether the RLC series circuit is underdamped, overdamped or 10
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critically damped. Also find VL (0+), * (0+) *+ nrstfx | ||
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3. (a) Using Millmans theorem find lr
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(b) By superposition theorem, determine the current In the 3 d resistor. 10 3sl vhMKd av (b) Bv SUDQrDOfiition thfinrem rlotarmina *u_ n jJ__/ | |
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4. (a) Obtain twig voltages using KCL equation for the network given Choose 10 any tree. -SL | |
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(b) Write cutset matrix and tie set matrix (or any selected tree. | |
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5. (a) Draw the dual network (i)
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(b) Find V0 by reciprocity theorem
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is closed at t = 0. Find the current 1, and i2.
Con.3389-VR-3057-09
6. (a) The switch
(b) Three phase three wire system has line voltage of 250 V, supplies two balanced 10 ioad one in delta ZA = 15 lo and other in star Zy a 10 [30. Obtain the total power in the circuit.
7. (a) Compute V in the coupled circuit.
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(b) (i) State and explain maximum power transfer theorem. |
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| Earning: Approval pending. |
