University of Mumbai 2008-3rd Sem B.E Electrical and Electronics Engineering Electrical Networks - Question Paper
Electrical Networks Sem III June 2008
[ Total Marks : 100
Con. 3488*08.
(REVISED COURSE)
(3 Hours)
N.B. (1) Question No. 1 is compulsory.
(2) Attempt any tour questions from remaining.
(3) Assume suitable data if necessary.
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1. (a) For me circuit C1, find the posvef delivered by dependent current source
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(b) Use Superposition theorem to find voltage v2 in circuit C2. |
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(c) Write short notes on Initial Conditions.
2. (a) Find the drop across 10 O resistor for circuit C3
(b) The reduced incidence matrix of an oriented graph is given
(i) Draw the graph.
(ii) How many trees are possible ?
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3. (a) Switch in circuit C4, is changed at t = 0 from position 1 to 2, solve for 1(1).
(b) For the circuit C5. determine the maximum power delivered to toad impedance ZL.
T. (a) Determine t,, <Jit/dr. Oi/ai, du/dPTnd cFy'dt* for circuit Cb.
(b) The circuit C7 is in position 1 at t = 0, after t = 3 J switch is changed to position 2. find the transient current !(t) for
(i) 0 < t < 3J and (II) t > 3J (J -* time oonstant)
5. (a) For the circuit C8. find the value of unknown impedance provided no current flows in branch y.
|b) A three phase, three wire, 100 V, ABC system supplies a balanced delta load with impedance of 20 /. 45 U :
(I) Determine the phase and line currents and draw the phasor diagram.
(H) Find the wattmeter readings when two wattmeter method is used. (Hefer C9)
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6. (a) Using the Compensation theorem* calculate the change in current in the circuit C10, when reactance is change to j35.
(b) Demonstrate the reciprocity theorem by computing Ix for circuit C11.
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7 (a) Explain how reactive power can be measured with the help of wattmeter.
(b) What do you mean t>y critical resistance, explain the terms over damped, under damped and critically damped system with JMpoet to series RLC circuit.
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| Earning: Approval pending. |
