I B.Tech - Regular Examinations, June 2009
First Year
ELECTRICAL CIRCUITS ANALYSIS- SET NO: 4
(Regulation 2007)
Time : 3 hours |
Maximam Marks:80 |
Answer any FIVE Questions
1. (a) Four resistances of equal value are available. Find
i. The total equivalent conductance and total equivalent resistance ratio
ii. The ratios of current drawn in each configuration.
iii. The ratios of power drawn by each configuration in each element.
Considering that the supply voltage is same when the configuration are
in series and parallel.
(b)Find RAB in the network as shown in figure 1b.
2.Obtain the equation for the total inductance when two coils are connected in
(a) Series aiding and opposing
(b) Parallel aiding and opposing.
3. (a) Derive the equation for resonant frequency and the bandwidth for series RLC
circuit.
(b) What is locus diagram? Draw and explain current the locus diagram for a
series RL circuit, with fixed resistance, deriving necessary expressions.
4.(a) Three identical impedances of (3+j4)
are connected in delta. Find an equiv-
alent star network such that the line current is the same when connected to
the same supply. (b) Three impedances of (7+j4)
, (3+j2)
and (9+j2)
are connected between
neutral and the R, Y and B phases. The line voltage is 440V, Calculate.
i. The line currents and
ii. The current in the neutral wire.
iii. Find the power consumed in each phase and the total power drawn by
the circuit.
5.(a)Draw the oriented network graph from the incidence matrix given below.
(b)Draw the graph of the network shown in figure 5b. Obtain a tree thereof.
What is the number of mesh currents required for the network.
6.(a) Solve for current in 5 ohms resistor by principle of super position theorem
shown in figure 6a.
(b) State and explain Millmann’s theorem.
7.The switch K is kept at position 1 for a long time and moved to position - 2 at t =
0. Find the currents in both the cases as shown in figure 7.
8.8. (a) Find the Y - parameters for the bridged T-network as shown in figure 8.
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